Abstract:The process, method and application scope of the high pressure jet grouting technique are de-scribed. A cornparison is given to the equipment and parameters employed in the single, dual and triple pipegrouting methods and their grouting effects,with field cases listed. New advances having been made in the theo-ty, equipment,technique and the application scope are introduced. At length,some problerns existing in the en-gineering application are put forward for the future discussion and solution.

Abstract:The main theories applied in landslide treatrnent both at home and abroad are introduced.Theproblems existing in the theories applied in the field and the technical key are analyzed.It is proposed that the de-formation systern be used to guide landslide treatment,with specific applications described.

Abstract:The main types and structures of the pre-stressed cable used in slope and landslide stablizationboth nationally and internationally are described with field application of the cable in landslide treatment listed.

Abstract:With wide work,the study is focused on the material components and structural characteristics ofthe red soil of different causes of formation. The major factor determining the geo- technical engineering proper-ty of the red soil is free iron oxide. Because of presence of manv free oxides of different kinds and different formsresulting in high strength of the red soil with high water content and high porosity,the standard value for thefoundation bearing capacity of the red soil can not be identified with that for the common clay. Description is alsomade on how to increase the foundation bearing capacity and determine the standard value.

Abstract:This paper describes the main equipment and technique employed in the foundation pile construc-tion for the overhead crossing bridge on Jinshui road in Zhengzhou and the measures taken to deal with a fewproblems in construction.

Abstract:The speed loss mechanism of the down hole motor drilling tool in the deep hole with cornplete cir-culation loss is analyzed. It is proposed that incorporation of the pressure adjusting ring to the upper end of thedrilling tool be the solution to it. Design calculation are made on the pressure adjusting ring. The field applica-tion has effectively tackled the speed loss problem of the drilling tool in a dry hole around 900m deep.

Abstract:The advantages of the Pulse Electroplating Method are studied;The coating constituents for theelectro-plated PDC are properly selected. Lab tests show that it is feasible to use the Pulse ElectroplatingMethod to manufacture PDCs and PDC bits. The application results are fairly ideal.

Abstract:The development of the geodrillingtechnique of China in the new centurv is discussed.Itis expounded that the poly-drilling technique is thedeveloping trend of the geodrilling technique of Chinain the future. The necessity and advantageous condi-tion to develop the poly-drilling technique is ana-lyzed. The preparatory work be done in the oioneer-ing stage is presented.

Abstract:A great deal of analyse are conductedon the foam mud cake in its micro-structure,reveal-ing the foam mud cake is characterized with viscoelas-ticity and water dispersion,The caving prevention andwall protection mechanism of the foam mud is demon-strated.

Abstract:This paper illustrates the joints,thelength of each knot,the diameter,the arrangementand reparation of the air pipe in accordance with theproblems existing in ventilation in mid-deep slantshaft, and comparison is given to the ventilation effectof the system improving and non-improving.

Abstract:Analysis is made on the directional de-molition of the inclined brick tubdar structure. It ispresented that the deviation correction should be con-sidered during design of the directional opening, withthe formula for calculation of the devition correctionangle derived from the mechanical balance theory.

Abstract:The drilling personnel injuries which have happened in an exploration brigade for the past 15years are induced and analyzed by means of mathematical statistics,A discussion is made on the law by which thedrilling injuries occur at daytime,relationship between the injuries and the drilling age,as well as the injuredpart of the body and the injury form.