Abstract:The analysis is made on the main factors of geology, investigation design, construction and management which affect the soil and rock engineering project reliability Appropriate preventive measures and solutions are suggested

Abstract:The construction method, equipment and bore hole wall protection technology of the 100m long bored pile are described, with the analysis on the feasibility of suction reverse circulation method, balled bit problem in seriously weathered layer and technical measures for solving the problem presented

Abstract:This paper briefly introduces the use of the cable bolt anchoring technology, initially analyzes the anchoring mechanism of the fully bonded cable bolt in the jointed rock mass, and examines some factors affecting the tensile bond strength and the shear strength of the cable bolt in the jointed rock mass.

Abstract:The design of the well point dewatering program are presented with good results obtained in application

Abstract:The feasibility of the post pressure grouting for the bored pile is explained in four aspects: choice of formation, effect prediction, economic analysis and application

Abstract:The combination of the fluid powered central hollow DTH hammer with the hydraulic reverse circulation con coring process eliminates the core blockage, resulting in higher drilling efficiency and longer bit life, and providing a good application prospect

Abstract:The design of the dual way water swivel is briefly described with the problems encountered in use and corresponding solutions

Abstract:The structure of the kerf diamond bit, the requirements on the bit blank, the process and manufacturing specifications are described and analyzed Formulae GW 1 and GW 2 are sorted out through the sifting of different bit matrix formulae, which have shown good results in the lab and field tests

Abstract:The grey prediction is conducted for the replacement interval of the drillrig wear parts using the Grey Prediction Theory and the ferro spectrum analysis Actual calculations demonstrate that the method provides good effects

Abstract:The history and present status of ODP is described with the emphasis on the drillship and the high tech used, as well as the development trend of the ODP drilling technology in the next century

Abstract:In the light of the unique problems concerning drilling equipment and drilling technology in in situ leaching sandstone uranium exploration, the relevant established experiences of the former Soviet Union is described with the discussion on how to design drilling equipment layout and enchance the study of the drilling technology in conjunction with the practical conditions

Abstract:The measuring method of the rock mechanical parameters and the relationship between the dynamic and static elastic parameters are described The actual acoustic well logging data is used to analyze and calculate the rock mechanical parameters

Abstract:Based on the analysis of the relationship between the indentation hardness and the rock destruction specific energy, it is concluded that the specific energy gives a more comprehensive indicator of rock destruction difficulty To simplify the measurement of the specific energy,a specific energy estimation method based on the indentation hardness, plastic co efficient and volumeric expansion rate of the indented crater is put forward with the calculation formulae of the specific energy derived, and a comparison is made between the calculation values and the actual measurements, which indicates some practicality

Abstract:A set of methods for the appraisal and optimization of drilling parameters are established based on the fuzzy comprehensive judgement theory in conjunction with the analysis of drilling information The whole process is easy and can provides valuable information for the proper match and optimization of the drilling parameters in actual drilling