Abstract:This article introduces the results of investigation on geo-drilling equipment market of China, referring to drilling equipment deploy information of geological exploration units, information on manufacturing, selling and application of geo-drilling equipment and requirements of geological exploration industry on new drilling technologies and equipment. On the basis of analysis on the investigation results， suggestions on the research and development and introduction of new drilling technologies and equipment and on enhancing administration of drilling equipment industry are put forward.

Abstract:2D arc well trajectory is considered with priority in conventional deviated and horizontal well design. However, because there are a lot of combination forms of hole sections and also a lot of resolution combinations of unknowns for the same hole section, the computation is very complicated to derive the computation formula for the solutions of each hole section combination and each solving combination. This paper studies the general solutions of arbitrary hole section combination and arbitrary solving combination, discovers that the constraint equation of hole trajectory design can be dissolved into linear algebra equation system or one of the four typical systems of equations. The computation formula of the real number solutions of the four typical equation systems is obtained and the discretion conditions of real number solution are given. This study has important significance for fundamental research and computer software development for 2D arc borehole trajectory design.

Abstract:Under-balanced drilling with nitrogen-foam is an international mature technology with advantages of low pressure of hydrostatic, less leakage, strong cutting carrying capacity, less damage to oil-gas layer and safe drilling in water-sensitive layer. With this technology, low pressure and low permeability oil-gas reservoir can be discovered and protected furthest for much higher economic benefit than conventional over-pressure well. It was applied in DF1 Well of Danudi gas field of low pressure and water-sensitive layer, and pollution on producing formation by ordinary slurry was solved.

Abstract:In coring drilling, under-water cement grouting was often used for wall protection, leakage blocking, borehole sealing and downhole accident treatment. The paper discussed the technology and the procedures, analyzed the causes of grouting failure and put forward the solutions.

Abstract:Quaternary loose soil, heavy strong weathered rock stratum, borehole collapse, complex deep rock structure and leakage were encountered while drilling in Chigou copper mining area, analysis was made according to these problems to take the aimed measures.

Abstract:The paper analyzed the formula selecting, testing and field application of drilling fluid in Hemei 1# well, summarized the technical measures of anti-collapse and lubricate and sticking control during drilling.

Abstract:The paper introduced BJS-L50 construction equipment of deep mixing continuous underground wall on its structural features, technical specifications and performance parameters, analyzed the economical and social benefits with engineering cases.

Abstract:According to sticking accident in anchorage hole drilling in landslide stratum, a pneumatic DTH was developed with two-way impact. The paper introduced its performance parameters, working principle and structural components, elaborated the pneumatic DTH design, and made performance checking calculation to virtual prototype to verify the feasibility of the equipment.

Abstract:Using the finite difference procedure FLAC3D to simulate the excavation process of a deep foundation pit by a double-row piles retaining structure, the paper analyzed the change of soil displacement fields in the excavation process. The studies showed that the space mechanics character of retaining structure and soils, the interaction between soil and retaining structure and the excavation procedure obviously affect the displacement and settlement of the retaining structure. The paper also discussed influence of stiffness change of soil between double-row piles on displacement and settlement, the displacement and settlement of lateral soil of foundation pit could be decreased by properly increasing the stiffness change of soil between double-row piles.

Abstract:According to the development history of injection grouting technology, the paper analyzed and commented the key problems of grouting in rock and soil masses, including the current research means and state of grouting material and slurry, grouting parameter determination, grouting method and technology, grouting monitoring and test; and summed up the technical difficulties with field cases. And what’s more, some deficiencies of grouting technology were pointed out with future development direction.

Abstract:In 403 section of Shenzhen metro Line 4, borehole should be completed for end-bearing pile in spherical weathered granite with high strength, anisotropy and large inclined angle, which was only 20m to nearby buildings, so rotary drilling was adopted for safety. Composite drilling technology of drag bit cutting drilling, button roller bit compacting and rectification by annular coring bit was adopted with wall protection by slurry reverse circulation.

Abstract:According to the successful field case of the foundation pit engineering of Zhengdong new district, the paper introduced the mechanism of micro-steel pipe pile in composite soil nailing support with combination of soil nailing and micro-steel pipe pile, which promoted wide application of this technology in deep excavation engineering.

Abstract:With engineering experience, discussion was made on influence factors for high-pressure jet grouting pile in reinforcement of roadbed and foundation of railway bridge pier, influence factors for cross section of pile, correlation between selection of equipments and piling quality and efficiency, correlation between slurry quality control and piling quality, and technical measures for some special stratum.

Abstract:The patent technology of the long spiral mixing pile is one of the emerging construction technologies. It can be used in the foundation pile treatment, foundation pit supporting project and the waterproof curtain, especially in the construction in hard stratum. The combined support technology of long spiral mixing pile inserted steel pipe and composite soil nail was used in a sewage treatment project in Beijing, it not only met the requirement of supporting and waterproof, but also reduced the cost. The practice shows that the technology is safe, reliable, economical and useful.

Abstract:The paper summarized the design and construction of combined support with pile-strut and foundation underpinning in foundation pit support engineering. It showed a successful foundation underpinning for nearby buildings by supporting piles.

Abstract:With some project examples, this article put common quality problems of CFG pile into two kinds: the error surpasses the standard stipulation for the geometry size and the physical performance destroyed and expired. And from this point, the influence to the bearing capacity of composite foundation was qualitative analyzed，primary cause of these problems and the countermeasures were put forward, and some suggestions were made on equipment and technology.

Abstract:Grouting ability was learned by the grouting test in Xiangshui reservoir dam area to determine the rational hole space, ranging distance, hole depth, construction technology, effective grouting method, grouting material and so on. The paper detailed the testing spots selection, design and construction of grouting test, analyzed the result of grouting test and made the comprehensive evaluation on grouting ability in the formation in dam area.

Abstract:The paper discussed and analyzed an important parameter—build-up intensity (the drift angle’s change of drilling hole in one meter length drilling, degree/meter) which influences the hole section designed. It has established the build-up intensity model through the whole stress analysis on drilling tool and has obtained the formula of build-up intensity affected by the resistance of soil and the curve of drilling tool in the preliminary stage of angle building. Then it analyzes the primary factors that affect the buildup intensity in the basis of formula and has got some conclusions. This paper also gives qualitative explanation on the rule of continuous buildup intensity by indoor tests.

Abstract:The paper mainly described the potential threat on field facilities from nearby landsliding. Landsliding investigation and checking calculation for stability were made, and landsliding forming reasons was analyzed treatment measures put forward.

Abstract:To develop matrix material with self-lubricating ability for impregnated diamond bit, research was made on addition of graphite power to conventional matrix formula. The bending strength, hardness, wear resistance and friction coefficient (with 60# white corundum grinding wheel as counter) of matrix materials were tested; the topography of wear surfaces was analyzed with scanning electric microscope. The test results showed that the bending strength and hardness of matrix material declined with graphite powder adding and the friction coefficient decreased with 60# white corundum grinding wheel; while wearing resistance increased at first with graphite content increasing, then decreased when the content of graphite exceeded 6.0%. Morphology analysis indicated that conventional matrix material produced obvious plastic deformation in wearing and the plasticity of matrix material declined with graphite adding, and furrow wears and flaking appeared.

Abstract:Kuangjia 1# tunnel is a separation type of one-way driving tunnel. The paper discussed the design and construction of biased pressure compound lining for V-grade surrounding rock at the tunnel portal, open tunnel subsurface excavation, half light and half dark and so on; and put emphasis on discussing the engineering experience of crossing shallow embedded under biased pressure section at tunnel portal with construction scheme of open tunnel subsurface excavation and half light and half dark.