Abstract:The main technical challenges present with large diameter rock socket drilling are analysed. The technical status quo of three conventional large diameter rock socket drilling methods, e.g. cone bit/disc cutter drilling method, percussive drilling method (no circulation and reverse circulation) and air/fluid powered DTH drilling method, is described with concrete proposals initiated for increasing the technical level of large diameter rock socket drilling.

Abstract:The research on directional drilling technology in China has stepped into the world advanced class. The achievements in research on directional drilling tools are enumerated with typical application cases of directional drilling. The description is focused on the advanced directional drilling technology in the world with proposals put forward for the extension of the application scope of directional drilling and the research on the relevant technology.

Abstract:This paper analyzes the reasons why the serious differential settlements of the buildings constructed on the backfill foundation happened and specific measures of grouting saturated backfill foundation are introduced.

Abstract:This paper introduces in detail the design and techniques of top supported jack up pile underpinning construction through an application case in a steel plant, and comparative analysis of subsidence is carried out.

Abstract:Drawing upon the experience on the existing computor controlled full scale drilling test bench and the computor controlled simulative micro drilling test bench,and based on many advanced techniques and reserach achievements, a portable multi purpose computor controlled drilling test bench has been successfully built up. The building process and relevant test results are described.

Abstract:Taishan JMZ150 is a new, hydro mechanical anchor drill. This paper presents the design, structure, parameters, characteristics and application examples of the drill.

Abstract:The expert system for the design and proper use of large diameter bits is composed of the subexpert systems for the design and proper use of large diameter bits and a graphical data base. The knowledge system, presentation as well as the maintainance of the knowledge base in the expert system are introduced in detail.

Abstract:YZX127 hydro hammer used for full face drilling is described with its structural characteristics, performance parameters and laboratory test results as well as the application prospects introduced.

Abstract:The explicit Lagrangian method is a new numerical analytical method different from the implicit difference method. The basic principle of the method is briefly described. The FLAC software developed on the basis of the method was used in the anchoring project of Lianzi Cliff dangerous rock mass for comparison of the conditions of the hazard cliff before and after the treatment. It is concluded with the summation of the experience gained from the use of the FLAC software.

Abstract:For solving the problem of high cost and long processing cycle of the mould adopted for manufacturing diamond bit using the leaching method, a new mould material(porcelain powder)is developed to replace graphite as a mould material. And a new moulding method is developed with the mould processes simplified and the cost reduced.

Abstract:A new type of impregnated diamond bit with two sorts of diamond abrasives has been developed, which can improve both penetration rate and service life simultaneously. Field drilling experiments have verified the advantages of the new bits, and the all round performance index of the new bits increased 179% compared with that of the traditional bits.

Abstract:With the explanation of the key points of the mechanism and method of low strain dynamic testing of the foundation piles, it is indicated that the testing mode of the dynamic testing combined with the static testing can improve the overall level of the engineering pile quality control effectively and the guarantee degree.

Abstract:Brief introduction is given on the establishment, application and development of the construction supervision system in China. Engineering construction supervision, nature of supervision body, supervision mode and related laws and regulations are descriled in detail. And the difference between engineering construction supervision and governmental superintending of engineering quality is presented.

Abstract:The experience for cutting and demolishing of the ball mill foundation at a cement plant using controlled balsting is introduced. Also applied successfully is the method of millisecond multi relay ignition by the non electric detonator outside holes, in order to increase the relays of detonation in controlled blasting.