Abstract:Four aspects are involved in the design of deep mixed complex foundation. The method of calculation complex foundation settlement is introduced with field cases. And its formula for checking of the compressiveshe experienced by the bottom of the presumed full-scale foundation are ho pasented. Theoretical calculation is made on complex foundation settlement, settlement ho are analyzed and settlement is predicted.

Abstract:Analysis begins with the simplified mechanics of the concrete castin g processand is focused on the factors influencing the concrete castability,with field cases taken as example.Technical measures are proposes for overcomign unfavourable factor.

Abstract:介绍了ＰＣＢＮ（立方氮化硼）的发展情况以及开发研究这种材料的意义，分析了其合成工艺中的几个关键技术问题及所采用的方法，并给出了对其性能进行监测的方法。

Abstract:A ZJS series of core barrels are developed to cope with strongly altered gold ore and body which is hard, brittle, of alternate hardness and difficult to core. The core drilling method and the obtained achievement are introduced with respect to the bit and core barrel used in different formation.

Abstract:Based on application of HZ308 multi-function core barrel in altered rocks and quartz vein gold ore forrnation measures ard proposed for preventing core blockage and wear due to using of the bottom jet flow bit.

Abstract:Analysis and discussion are conducted on the bit pressure determination method for impregnated diamond bits in terms of diamond exposure, distibution, compressive strength and indentation hardness of rock, and rock fragmentation Tnechanism. A comprehensive rock fragmentation mechamism is presented. The method and formula for calculating bit weight are determined.

Abstract:A brief deScription is made on the technical parameters, parameters, main features and benefit of DPP100-5drill, and the improving suggestion is proposed.

Abstract:The structure and operating principle of self-release mechanism for single-line grabs ar described.The major factors inflkuencing release flexibility and reliability are found out through force-balance analysis during releasing. The design theory of self-release mechanism is explained.

Abstract:A description is given to the structure, operating principle and design calculation result of DC non-spring, double-acting hydro-hammers used in large diameter drilling. The method of measurment and adjustment of its stroke, upper valve stroke and upper valve free stroke,lower valve stroke and lower valve free stroke are presented.

Abstract:The rheologic model of three-phase foam drilling fluid can be optimized with grey correlation analysis method. The Karson model is the main model for description of the rheologic properties of the drilling fluid.The drilling fluid has high apparent viscosity, high shear strength and strong shear dilution performance. The rheologic parameters are mainly influenced by gas liquid ratio and base mud properties.

Abstract:The formula of sulphoaluminate "S" instant-setting cement eusd in shut-off is introduced. The design of conducting and borehole sweeping tools and injection process are described.

Abstract:The total quality contral theory and method are employs in Karst water well drilling in Weibei,and good water sealing results were obtained.

Abstract:Blact hole cxplesion in a confed condition within tunneling is analysized,a stage-by-stage blast hole design theory and the related paraameters are presentes.