Abstract:Various new light shoring structures used in the Nan Kun Railway are described with their design and construction,as well as their applicable conditions

Abstract:The situation dimension and linear programing method of the grey theory is briefly described with field cases illustrating the detailed application process of the method for the optimized design of the prestressed cable bolt

Abstract:On the basis of the in depth analysis of the pump reverse circulation operating parameters, the characteristcs of the four pump reverse circulation operating parameters are obtained cuttings content, mixed fluid up hole velocity, cuttings rising velocity and cuttings suspension velocity; hence, the pump reverse circulation drilling characteristcs

Abstract:简要说明了锚孔弯曲的危害，对有关规范要求和影响锚孔弯曲的基本因素进行了分析，提出了目前预防锚孔弯曲的基本技术措施及测量技术，并对我国长锚索钻孔测斜仪器的研制开发提出了建议。

Abstract:The working principle, specifcations, characteristcs, experiment results and application prospects of the down hole data synchro aquisition system are introduced

Abstract:This paper presents the design concept, main parameters, main features and production trial of compact trackless mucker loading and transporting equipment for short shallow tunnels

Abstract:This paper describes the design method of the small sized screw motor, and the formula of its performance parameters It presents a multi objective fuzzy optimization model of the screw motor design with a concrete design

Abstract:The application of powder metallurgy technology in exploration engineering is summarized First,the cemented carbide drilling history is reviewed; then,the role of powder metallurgy technology in diamond bit manufacturing and its new development are discussed; finally,the new advances in cermet used for drilling tools are introduced

Abstract:With the examination of the rock cutting and wear mechanism of the impregnated diamond cutting head, the causes are found out for the rounding of the working edge of the diamond cutting head And several methods are proposed to overcome the rounding phenomina

Abstract:The theory and current status of the SHS coating technology are reviewed and its application prospect in the geological exploration field is predicted

Abstract:With the methods of the Safety System Engineering, this paper analyses and discusses the safety problems concerning construction safety management, slope engineering, foundation pile construction, diaphragm construction, blasting demolition

Abstract:The applicable temperature range of SCA is classified into rapid effective range, common effective range and ineffective range by analysis of the swelling mechanism of SCA and the change of the swelling pressure with temperature and time A temperature control instrument is developed to solve the problem of ineffectiveness of SCA,and the method of calculation of controlled fragmentation is put forward