Abstract:Mechanical continuous whipstock is one of the directional drilling techniques. Nowadays, single-slider and hole wall support are used for commonly-used LZ continuous whipstock with small radial braking torque, the angular displacement is easy to occur in the whipstocking process, which affects the whipstocking effect, and the slanting angle adjustment is not easy to operate. In order to solve the slanting stability, a new type of double-slider continuous whipstock is specially designed and developed, which is stably clamped and the slanting angle can be adjusted, the device reliability is verified by field test. The innovative features of this new continuous whipstock are: (1) double-slider structure, there is no precedent in China, has been approved utility model patent; (2) The slanting adjustment mechanism is added, which can be adjusted according to the construction requirements; (3) The upper slider is returned back by means of the threaded connection between the work spring and the upper slider assembly; (4) the lateral force of the upper slider is controlled by a pressure-division joint, which reduces the slanting drilling resistance when the clamping requirements are met. This new type of double-slider continuous whipstock is the initiate both in China and abroad with independent intellectual property rights, which has good application effect and good prospects of development and popularization.

Abstract:The special casing is one of the key factors for geological prospecting casing drilling technology. In the process of casing drilling in geological prospecting, the special casing is used as a wire-line drilling pipe to transfer the drilling pressure and torque; after drilling, it is kept in hole as technical casing with casing function. The selection and development of the special casing structure, material and processing technology are completed through indoor tests and the effects are obvious in field application.

Abstract:The high temperature and high pressure composite insulation tubes are mainly used to solve the problem of borehole measurement under the condition of ultra-high temperature and ultra-high pressure. In order to obtain the key technologies such as vacuum heat insulation and high pressure seal in ultra-high temperature and ultra-high pressure environment, the high temperature and high pressure compound insulation tube being developed can provide a high temperature pressure-bearing tube for the ultra-high temperature borehole measuring instrument, which can be used at the temperature of 270℃ and pressure of 120MPa. The indoor test and field application show that the compound insulation tube can meet the requirements of ultra-high temperature and ultra-high pressure, can be applied in high temperature geothermal energy drilling engineering, hot dry rock drilling, scientific drilling project, deep mineral resources exploration and deep oil & gas resources exploration, which provides technical support for ultra-high temperature and deep drilling measurement.

Abstract:This paper introduces the experimental study on the application of ultrafine FeCoCu pre-alloy powder in the matrix of diamond bits. According to the experimental data, with 663Cu contents of 30%, adding FeCoCu pre-alloy powder to the composition of the diamond bit matrix and by adjusting the proportion of FeCoCu powder and WC powder, the hardness of the diamond bit matrix can be effectively adjusted to adapt to different strata. Through the regression analysis, the mathematical relationship between the matrix hardness and FeCoCu contents is obtained, by which, the matrix hardness can be predicted and FeCoCu dosage also can be calculated. The actual drilling tests in field show that the comprehensive performance of the diamond bits matrix with FeCoCu pre-alloy powder is significantly improved, this experimental study provides experiences for further research on wear resistance of diamond bits.

Abstract:The development of nuclear power requires a stable supply of uranium resources. For the strategic selection and investigation & evaluation of sandstone-type uranium deposits in oil and gas basins in northern China, the main anomalies and key areas need to be verified by coring drilling. In view of the poor geological conditions of extreme loose and broken strata with low core recovery, shallow gas development, high well control request, large diameter hole reaming with difficult well inclination control and difficult rock carrying, construction in extremely cold winter and high environmental protection request, a set of green integrated drilling techniques and methods is successfully explored for drilling in extremely loose fractured formation in shallow gas area such as single pipe cone valve coring, environment-friendly high viscosity and low cement loss slurry, remote well control, graded reaming with drill collar and guiding drilling tool, which provides technical support for prospecting breakthrough of sandstone-type uranium deposit in northern China and energy supply security with extension demonstration.

Abstract:Xiangyongdi well-1 drilling engineering for the geological survey of shale gas was carried out in the Paleozoic shale gas field in the Middle Yangtze region of China, the final depth was 2,224.69m with full borehole coring, logging and well logging. This article mainly introduces the general situation of the project, the main drilling equipment, logging equipment and well logging equipment used in drilling engineering and the core drilling technology of Xiangjingdi well-1. The technical measures adopted for drilling accidents encountered in drilling construction and the drilling construction technology of shale gas survey well are discussed.

Abstract:Sandstone coring is a drilling technical problem that has not been completely solved so far. There are many kinds of sandstone, but they all have the same characteristics: loose structure, no cementation or slight cementation, expansion in water and good permeability. Core recovery is low in sandstone drilling and the borehole is easy to collapse. In order to solve the technical problems in sandstone coring drilling, a set of sandstone coring technologies has been summarized by the study on drilling process technical parameters, coring device structure, drill bit optimization design, mud formula, drilling machine matching, core getting by core sintering with drill and core collecting by water pressure, and has been applied in the actual drilling production. All the technical indexes met the geological requirements, which provide valuable experience for core drilling in in-situ leaching sandstone.

Abstract:Taking the drilling engineering design of Xinkedi well-1 as an example, the paper briefly describes the general requirements and principles of the engineering design and introduces the difficulties in engineering design, drilling structure design, drilling machine selection and equipment requirements, drilling tool combination and drilling parameters, drilling fluid, well cementing, well control design, logging, logging and drilling engineering construction.

Abstract:Since the last glacial age, climate warming led to the drastic changes in glacier environment in the global mountain areas, and the decrease of the stability of the Moraine Lakes leads to the increase of outburst frequency, which has become one of the frequent glacial disasters in more than 10 countries and regions all over world included China, Nepal, Russia, Peru and etc. Flood and debris flow induced by moraine lake outburst, due to its large scale, fast forming and wide spread, cause heavy losses of infrastructure, life and property in the downstream area. Through the summarization and analysis on the research situation and development status of Moraine Lake outburst flood events, outburst causes, outburst patterns and features of GLOF, this paper provides reference for the research and evaluation of moraine lake outburst.

Abstract:As glacier relics, glacial tills become special rock body in a planning selected line section of Sichuan-Tibet railway and highway along Parlung River due to its wide gradation, large pore, heterogeneity and permeability, etc, and is associated with glacial geological hazards in the south-east Tibet, which makes the formation mechanism and prevention research on geological hazards in Parlung River basin even more complicated. In this article, based on the analysis on the research results obtained according to the physical property characteristics of glacial tills by scholars in China and abroad in recent years and combing with the field investigation and the results of indoor and outdoor tests, the distribution characteristics, sedimentary structure, physical properties and engineering mechanics properties of glacial tills, as well as the research progress of glacial tills physical mechanics are summed up, 3 key issues in the research on glacial tills in Parlung River basin and the next step of research route are put forward to provide parameter basis for the subsequent glacial tills research and planning and construction management of Sichuan-Tibet highway.

Abstract:The geological hazard survey has undergone several rounds of development since 1990s, and now it has evolved into a disaster geological survey based on the disaster-formative background investigation and hidden danger identification. Southeast Tibet second-level project is located in southeastern Tibet with the characteristics of inadequate geological work, fragile geological environment and poor working conditions. The project mainly focuses on 3 aspects of the detailed geological data, the law of geological disasters and the evaluation of the disaster-formative background and hidden danger identification. In order to achieve these requirements in the special environment of southeastern Tibet, the field survey data acquisition system, InSAR, 3D laser scanning, UAV aerial survey remote sensing system, simple observation and some other technical methods are applied. The applicability of various survey techniques is also summarized. By summing up experience and finding deficiencies, the reference for future investigation and evaluation in this area can be provided.

Abstract:An effective way for geological disasters prevention and control is to carry out geological disaster zoning and risk research and further delineate high risk areas of geological disasters to save prevention and control costs and achieve the effect of risk assessment. With the complex geology and geomorphology, all kinds of geological disasters developed in Kaiping County of Beichuan. On the basis of detailed geological disaster investigation, this paper intends to make the risk assessment on the geological disaster in this area. Taking the factors of single landslide’s volume, area, height difference, distance to the river, lithology and deformation signs as the analysis units, the landslide hazard zoning can be realized in a large-scale range, and the maps of the geological hazards risk and the geological hazards susceptibility are made. Based on the interpretation of remote sensing image, original data query and the field investigation, the distribution map of the land types in the study area around Kaiping Township is made. Combined with the danger and vulnerability of a single landslide and in this region, a comprehensive map of the surrounding regions of Kaiping Township is made. The effective geological disaster risk zoning of the study area is completed.

Abstract:Taking Jiangkou Town as a case study and based on the high definition DEM of county town, all the slopes in the study area with potential danger and threatened object are delineated and numbered. Based on the “semi-qualitative and semi-quantitative slope risk assessment table” and using the engineering geological analogy method, the survey was conducted on each delineated slope to obtain the risk scores and vulnerability scores. The risk and vulnerability are divided into high, medium and low levels with the method of natural discontinuity, and then a risk assessment matrix is established by putting the assessed risk level and the vulnerability level as row vector and column vector respectively. Through the risk matrix, the risk level of each slope is obtained. At last, the risk grade of each slope is shown on the geographic information graph and VR panoramic photography to form a risk assessment of product.

Abstract:Self-bearing pre-stressed anchor cable is a kind of tension and pressure compound pre-stressed anchor cable, which can be locked by tensioning without grouting, and is suitable for the rapid anchoring engineering construction of the landslide disaster emergency rescue. Combined with field test data, this paper analyzes the integral tension and anchor cable stress distribution laws of the self-bearing pre-stressed anchor cable and compares this cable with common tensile anchor cable, it is shown that the self-bearing pre-stressed anchor cable not only has the characteristics of rapid anchoring without grouting, but also has uniform stress distribution in anchorage section to fully play the anchoring function in the whole anchoring section, which reflects the advantages of this new type of pre-stressed anchor cable.

Abstract:The landslide is controlled by the geological environment conditions and the geological structure of the slope. There are differences in the pattern of slope instability of different geological structures. Take Houlongmenshan phyllite rock area as an example, based on the field investigation, the relationship between the mechanical model of the rocky landslides in this area & the slope geological environment and the slope structure is summarized, and then select key factors which control the occurrence of landslides, such as slope structure, slope gradient, and slope surface morphology, etc., and use the weighted stack function of ARCGIS software to quantitatively classify the landslide-prone areas of different models. The main understanding are achieved. （1）The phyllite is a layered soft rock. There are 3 types of landslide: “the sliding-tension cracking model”, “the creep-bending model” and “scale toppling model”. “The sliding-tension cracking model” mainly occurs at a slope of 30°～45° where rock dip more than slope. “the creep-bending model” occurs within the slope of 30°～45° where rock dip less than slope, and “the scale toppling model” occurs in the reverse slope where the rock dip is more than 65°. (2)The overlay analysis based on ARCGIS software showed that: the area of “the scale toppling model” area in the zone is 8.73km2, the area of “sliding-tension cracking” area is 4.31km2, the area of “the creep-bending model” area is 3.28km2, and the landslide type is dumped. The result of the comparison of landslides and areas with high incidence of landslides has proved that the landslide-prone areas basically agree with the actual conditions.

Abstract:, A large number of collapse accumulation accumulate on the upper part of the high and steep slopes after the earthquake in the strong earthquake area. The accumulations are far away from the residential area. Once they are induced into the debris flow, a new secondary geological disaster will be formed, which will seriously threaten the lives and property of the residents below. Taking the debris flow of the Pingshiban slope in Kaiping Township of Beichuan County as an example, the collapsed accumulation body of Pingshanbangou “5.12 earthquake” under the influence of strong rainfall turned into a slope debris flow Shijuchangzhen in 2010 and 2013. Based on the introduction of outbreak characteristics of flat stone debris flow, this paper analyzes the starting conditions and influencing factors of collapse accumulation body by the unevenness coefficient of particle size, the discriminating index of starting body for accumulation, and the catchment area of the trailing edge, etc.In response to the development characteristics of such disasters, a prevention and control approach for prevention through upstream stabilization and solid source methods is proposed. In order to provide a reference for the study of starter and control of high and steep slope deposits.#$NLKeywords: collapse accumulation; slope debris flow; unevenness coefficient; discriminant index; prevention

Abstract:Jiare landslide is located in Jiaxue Township of Seda County in Ganzi Prefecture and it is a typical traction landslide with average slope of the landslide body about 35°, it is mainly composed of gravel soil. The landslide is about 195m in length, 280m in width and 15m in average thickness. The total mass of the landslide body is about 600,000m3, which is a medium-sized landslide. At present, the deformation of the upper and middle parts of the landslide mass is obvious. Once the landslide occurs, it will directly threaten the safety of the life and property of 160 people in 41 local families. Based on the field geological survey, this paper makes a qualitative analysis on the deformation and failure mechanism of the landslide body and makes a quantitative analysis by using 3-dimensional finite element numerical simulation, which is of great significance for the study on the stability of the same kind of landslide.

Abstract:It is inevitable for long-distance oil and gas pipelines to go through the areas with complex terrain and geological conditions, where are often high-risk areas of geological disasters, and different types of geological disasters threaten the pipelines safe operation in different ways. Taking the risk assessment case of Puguang gas field ground gathering and transportation gas pipeline, (1)Establishing the risk assessment model and evaluation index system of regional pipeline geological disasters. （2）Completing the risk assessment of geological disasters for gas pipeline, dividing the risk of geological disasters along the pipeline into 5 grades from high to low risk zones. (3)According to the zoning results of the geological disaster risk assessment, the pipeline geological disasters risks are divided into 50 risk sections, including 2 highest risk sections, 14 high risk sections, 20 medium risk sections and 14 low risk sections. The evaluation results are coincident with the actual situation, which provides important auxiliary decision-making for prevention and control of geological disasters along pipeline and give reference for regional pipeline geological disasters risk assessment.

Abstract:At present, the quantitative evaluation methods based on slope influence factors have their own limitations. Based on the monitoring data, multiple regression models are proposed to quantify slope influence factors. Through the fusion of the determined slope influence factors and the regression model, the problem of selecting and quantifying the influence factors in the process of slope stability evaluation is solved to a certain extent, which is beneficial to the establishment of an accurate slope stability analysis model. Finally, the model is applied in the slope of a reservoir accumulation body of a hydropower station, and the influence factors of the slope are quantified. The changes of the influence factors before and after Wenchuan earthquake are analyzed.

Abstract:With the acceleration of mountain highway, it is unavoidable to induce landslide disasters in many road constructions. Take Shawosi landslide as an example, this paper analyzes the history of slope deformation, the characteristics of the landslide boundary and the slope body stability, the conclusion is that the landslide body is in a slow creep stage and belongs to a medium-sized landslide. In the case of 20-year severe rainfall, the slope is in an unstable state and may slip again. According to the distribution range of the landslide bodies, the dangerous area range and the nature of the landslide, the treatment measures of sheet-pile wall and back edge crack landfill with drainage ditch is are proposed for control the slope deformation, which can provide example for the treatment of highway slopes.

Abstract:In view of various geological hazards occurred during the highway operation period at the subgrade slope, bridge foundation pit slope and front slopes at tunnel entrance & exit formed in the highway construction, the post construction evaluation and investigation of the above mentioned 3 slopes are put forward, and some constructive suggestions are given for highway normal service and geological hazard control measures.

Abstract:This paper introduces the characteristics of budgetary estimate (budget) standards of the geological hazard control project of Sichuan province, such as the dynamic of labor cost, material transportation, charge standard, construction technology and project management. The main problems existing in the standard are enumerated through typical cases, such as the business tax is replaced by value added tax, partial quota consumption of the budget quota of the treatment project isn’t in line with the actual consumption level of the industry, the specification of the exploration and design standards is not perfect, the calculation method of investment estimation is too complex, the calculation rules of the engineering quantity are not perfect, the construction of small temporary facilities and temporary works should to be further differentiated. According to the above problems, the conception of revising the compilation and review provisions, the unit/time/fee quota of the construction machinery, budget quota of the treatment project, the standard of the survey and design budget and the calculation rules of the engineering quantity are put forward.

Abstract:This paper introduces the problems often encountered in the budgeting process of the geological hazard management project in Sichuan Province, including the lack of precise understanding of policy documents, the large error in work quantity calculation, the unfamiliarity of the quota standard, the imperfection of design documents, the inadequate personnel communication and so on, and puts forward the related opinions.

Abstract:The main influencing factors related to the fording landslides in the Three Gorges Reservoir area are the water level and rainfall, which are also the main inducing factors behind the instability of landslide bodies in the reservoir area. The annual rise and fall of the water level in the reservoir area are not conducive to the stability of the landslide, and rainfall, especially heavy rainfall, also induces landslides. When rainfall adds to the fluctuation of water level, the landslide will intensify. Therefore, it is necessary to analyze the leading factors affecting landslide deformation. In June 2016, the automatic monitoring of landslides in the Three Gorges Reservoir area was carried out, making statistical analyses of data convenient and reliable. Taking into account the variables such as the landslide deformation rate, rainfall, reservoir water level change, maximum water level change rate and submergence degree, the paper analyzes the fording landslides based on grey correlation analysis. In the stage of falling water level, the deformation of the soil landslide is greatly affected by the reservoir water level. In the stage of rising water level, the deformation of the upper part of the soil landslide is radically affected by rainfall, while the lower part of the soil landslide is affected by the water level. Generally speaking, the rock landslide is always the most affected by the reservoir water level.

Abstract:With the economic development in China and the promotion of the conversion of “coal to gas” policy, natural gas, as a clean energy, will be increasingly applied to the future life of residents. Natural gas storage tank is an important part of natural gas supply gas source system, and the tank safety has received much attention. As a common geological disaster, foundation settlement is likely to cause the gas tank to tilt, which may even cause gas storage tanks to deflate and explode. Therefore, it is particularly important to carry out settlement observations at natural gas storage stations. As a common means of settlement monitoring, seo-robot has the advantages of high precision, low cost and easy operation. In the measurement, due to the observation conditions and some other factors, the measurement data is inevitably superimposed on the “noise” interference, in order to eliminate the abnormal data, Grubbs criterion is used for data processing. Taking No. 1 gas storage tank of Nanchong gas storage and distribution station as an example, this paper introduces the observation technology and data analysis of the gas storage tank settlement.

Abstract:Fujiang River is an important source of drinking water in Jiangyou city, once suffering pollution from upstream water, it is necessary to be replaced by water supply in the emergency water source in time. According to the characteristics of the watershed, Qinglian town is selected as the emergency water source of Jiangyou city. Through the investigation and study on the quantity of groundwater resources in Qinglian town, the groundwater recharge, storage and consumption in this area are comprehensively studied, and the water samples of the water source are collected and analyzed to obtain the hydrochemical characteristics of the water source. The results show that the groundwater quantity and quality of Qinglian town meet the requirements of emergency water source of Jiangyou city. Finally, the suitability of emergency water source in Jiangyou city is evaluated by means of AHP.

Abstract:15 water samples were collected through chemical analysis in Jiangyou City emergency water source and its upper and lower reaches. The hydrochemical characteristics of the groundwater source and the change law of hydrochemical of the upstream and the downstream were analyzed according to the concentration of main ions, Piper diagram and the variation along the Jianjiang River. The results show that the groundwater in the study area is weak alkaline belonging to hard water and extremely hard water. The average value of TDS is 281.446mg/L, the main cations are Ca2+ and Mg2+, and Na+ + K+ the second; the anion is mainly HCO3- and SO42- with less Cl- and the chemical type of groundwater is HCO3--Ca2+. From upstream to downstream, there is an overall increase in both TDS and main ions of groundwater. The chemical type of groundwater changed from HCO3--Ca2+ type to HCO3-·SO42--Ca2+·Mg2+ type.

Abstract:Based on the hydro-geological investigation of groundwater in Pingshan area of Yibin City, the groundwater occurrence environment, such as stratigraphic distribution, formation structure and water-bearing character in Pingshan area, is studied, the underground water is classified as pore water in loose rock strata, fissure water in bedrock, interlayer water in clastic rock and water in carbonate karst fissure. Through the analysis on the hydro-chemical characteristics of 122 groups of water sample in the study area, the spatial distribution map is established based on the Piper trilinear diagram; on this basis, the controlling factors of groundwater are explained by correlation analysis, principal component analysis and ion ratio coefficient analysis; and the spatial distribution characteristics of groundwater hydrochemistry in Pingshan area and the formation causes are revealed. The research results show that the groundwater in Pingshan area mainly are of HCO3--Ca2+, HCO3-·SO42--Ca2+, HCO3--Ca2+·Mg2+ and HCO3-·SO42--Ca2+·Mg2+ types, which is mainly influenced by the dissolution and filtration of stratigraphic lithology and atmospheric rainfall. The fundamental data is of great practical significance to guide the groundwater exploration and utilization in the Southern Sichuan.

Abstract:Due to the complex variability of karst areas, it has been a major problem difficult to break through in hydrogeology for how to accurately predict the water inrush of long tunnels in complex karst areas. Based on the case of the water inrush in Niulanjiang-Dianchi water diversion project, 5 major control factors: the lithological characteristics of the stratum and the influence of geological structure, the selection of the inrush water prediction method, the selection of calculation parameters, the determination of the influence range of the tunnel gushing water and the diversion of the hydrogeological unit are used respectively to summarize and analyze the impact on the prediction accuracy of water inrush in tunnels. According to the change law of the predicted value and the actual value under different factors control, a method to improve the prediction accuracy of the water inrush in tunnel is put forward, and its feasibility is verified by combining engineering examples. The conclusion can provide reference for improving the future prediction accuracy of tunnel water bursting in karst area.