Abstract:Various factors affecting the GIN parameters were found out through grouting testing result analyses. Based on the influence elements, the experiential regression formula which describes the relations between influence and GIN was derived out through plurality linear regression. The regression formula can be refrences to further studies and practices.

Abstract:The article introduces the tests on post grouting into bored pile in construction engineering in Shanghai, analyses the test results, presents some technical measures and practice deserving of attention in application.

Abstract:Tunnel section measuring instrument and laser ranging technique are presented. Researches on high accuracy ranging system is discussed based on laser ranging principle. The difficult problem of contactlessly measuring sectional convergence in the tunneling field is solved.

Abstract:The annular multinozzle jet pump is especially fit to pump the mix liquid containing large amount of solid particles because the drawn liquid flows in one direction in the pump. It may be widely used in reverse circulation drilling in large diameter well and in removing the river mud. Through a serious experiments, the effects of each structural parameters of the pump on pump characteristics were studied. The study provided scientific basis for designing annular multinozzle jet pump.

Abstract:The optimized structure parameters, shape of cutting elements, proper material for bit body and heat treatment of PDC anchor bit are obtained through a series of lab tests and several design modification. The results of field tests proved that PDC anchor bit is ideal in mid hard rock drilling.

Abstract:Main causes of mechanical failures which often happen during the work are analysed. The solutions are put forward. Placing a safety clutch with springs and steel balls on transmission shaft of the drill can resolved the mechanical failure problems. It is proved by repeated tests.

Abstract:Pressure of reinforcing grouting for the branch pipe of diversion system in Tianhuangping Power Station is 9.0 MPa. Based on such a pressure, tests were made on both of high pressure inflation rammers and mechanical rammers. Through analysis, advantages and disadvantages of both kinds of rammers as well as the scope of application are summed up.

Abstract:A new view of using value A and B of rock as indications of rock drillability is put forward. The principle as well as methods of measurement for value A and B are researched. It is practicable to make bit formula using value A and B of rocks as guiding facts.

Abstract:The article introduces the results of indoor mud test and drilling mud test at Nanhai oil field using the sepiolite originated from Hunan Province. The analysis and the test show that the primary components of the clay are sepiolite, quartz, talc and a spot of calcite, and the particle size of the clay is influential to the mud productivity. The clay can be effectively dispersed in NaCl or Na 2CO 3 solution and build up stable viscosity, but it demands stronger shearing force while creating mud. The mud test at Nanhai oilfield had basically achieved the expectant purpose.

Abstract:Combined lining of the primary bolting and shotcrete lining and the secondary formwork puring concrete lining is applied to the system of waterproofing and drainage at Yanlieshan tunnel of Jiujiang Jingdezhen road. The design, construction and quality control of the system are introduced.

Abstract:The origin of water diversion tunnel's fracturing, weathering and crushing zone down fall at Xiawenyang Waterpower Station is analyzed. According to the properties and features of the down fall real, reasonable and proper treatment plans were selected and the problem of the down fall was solved.

Abstract:Formation and development of engineering reconnoitring industry in geology and mining system are reviewed. Emergence and development of project management as well as promotion it in geology and mining system are introduced. Considerations on works for the period ahead are presented.

Abstract:Based on the analysis of the present structure and quality of personnel of prospecting enterprises measures and countermeasures for enhancing the quality are suggested.