1999(4):1-3.
Abstract:Based on the study of AC frequency conversion power system, research is made on how to control and reduce drilling accidents in working procedure. An effective new way to safe drilling is provided.
1999(4):6-7.
Abstract:Functions and application vistas of core reoriented drilling tool are analysed. The working principle and performance characteri of the YCO type core reoriented drilling tool are introduced, making a summary and analysis for it's industrial production and application.
Zheng Zhichuan , Deng Hongchao , Lu Wenge
1999(4):8-10.
Abstract:The conic extruding bit usually be put into use when adopting percussionrotaryextruding drilling method to drill. This bit has very higher drilling efficiency than others in loose soil. But it's drilling efficiency would lower obviously in the middle and stiff plastic soil. To counter this problem, the writers analyzed the factors of soil that would effect drilling efficiency and the effecting reason. The shortcoming of the PRE bit have been find, and the cam PRE bit has been designed. The use range of the PRE drilling method be bind in this paper.
1999(4):11-12.
Abstract:A new type of composite cutter bits applied to pile foundation engineering is introduced. The cutter bit possess of several distinctive features comparing with the cutter bits imported from foreign countries and the domestic copy cutter bits by engineering application of Wuhan geological survey and foundation engineering corporation in Changjiang square.
/ Ruan Guangzhao , Huang Jincan
1999(4):14-15,21.
Abstract:The design and construction for deep foundation pit support are protrusive technical difficulties in present high and superhigh city buildings. Valuable experiences ranging from project to design construction and monitoring are presented through the engineering case study.
1999(4):16-19.
Abstract:Features and application ranges of CFG short pile compound foundation technology are introduced with 2 engineering cases. It is proved that this new technology is economical and easy to satisfy the bearing capacity and the final subsidence volume of compound foundation. Reseach is made on several theoretical problems about the design of CFG short pile compound foundation, and further research direction is proposed.
1999(4):29-30.
Abstract:The setting of underground water monitoring well can monitor the possible pollution resulted from productive facilities. Geological conditions around the monitoring well are complex. Highlevel techniques and short working time are demanded for the well construction. Reasonable drilling technique is selected, advanced well flushing methods are proposed and the job is finished with highquality on time.
1999(4):32-34.
Abstract:The paper presents some relative techniques about anchor wire drilling hole of control test engineering of slope disaster in Area on north slope of Lishan. It concludes building working platform for anchor, fix of drilling machine, selection of drilling technology and development of drilling tools. The paper also presents measures for preventing drilling hole curve, drilling technique in broken zone and fissure zone and technique of sealing hole and pluging loophole.
/ Chen Liyi , Zhu Zongpei , Wu Li
1999(4):35-37.
Abstract:Highlyactivative flyash is a new kind of specially processing grouting material whose main component is the flyash, an industrial waste material. Using the highlyactivative flyash with other additives which can strengthen cementation, increase early strength and improve grout performance can meet the requirements of grouting work. Compared with common silicate cement, the material possesses of the features of well flowability, proper cement time, high compression strength and high ratio of cemented rock in grouting application. Good results have got in static pressure grouting and high pressure jet grouting engineering.
1999(4):38-39.
Abstract:Three kinds of grout with phosphate as their retarder are screened out by orthogonal experiment according to engineering requirement. Their performance and feature are introduced.
/Zhan Jun , Jiang Rongqing , Gu Hualiang
1999(4):40-41.
Abstract:After analyzing work principle of grundomat hammer, this paper introduces using highpress hydraulic efflux in overhard soil layer and using lime gun in soft soil layer (more water) to enhance adapting capability of grundomat hammer.
/ Xue Jun , Ma Xiaochun , He Decheng
1999(4):42-44.
Abstract:This article introduced author's successful several post failure rock indentation experiment using their special implement and indenter with flat fundus under MTS815 Rock Mechanism Test System. The author analyzed the advantage in characterizing rock crush process and rock indentation hardness compared with traditional testing methods. At the end of the article, a few interesting subjects were presented which need to be further researched.
1999(4):45-48.
Abstract:The change of pressure and temperature during the diamond synthesis was analysed contrastly in powder catalyst and slice catalyst synthesis systems, the influence of these changes on the diamond synthesis has also been discussed. It was pointed out that powder catalyst is the better catalyst shape for diamond synthesis.
/ Fan Lasheng , Jiang Tianshou
1999(4):49-51.
Abstract:Various deviation surveying, preventing and controlling systems used for continental scientific drilling and deep hole drilling in crystalline rock are collected and summed.
1999(4):54-55.
Abstract:Controlled blasting method applied to demolishing underground reinforced concrete pile shaft is presented according to specific circumstances of drilling machine and outside restraint, especially including attention of drilling, charging and initiating etc.