Abstract:escription is emphatically put of the preliminary conclusions on power consumption,standard parameters, hole deviation rule and relevant technical measures,which resulted from analysis and study of experiment achievements.

Abstract:A comprehensive pack of remedying is done to Duyapeng Landslide in the critical sliding state, including drainage, reinforcement, shoring and Load reduction. A variety of monitoring results prove that the remedying has worked well.

Abstract:se of grouting techniques in construction and treatment of cities and towns can improve physicaland mechanical properties of the soil;createu consolidated mass in the groundlreinforce,elevate and correct thebuilding inclined due to foundation subsidence j and fill the formations,with large fractures and cavities and thegap behind the construction wall. Thegrouting techniques and their functions in construction are illustrated withfield cases.

Abstract:he construction technique of two groups of slm deep, large diameter trial bored piles sited atShanghai Triangle plaza is introduced; four inspection methods are applied to appraise the entire quality of thepiles. Some bits of experience are obtained.

Abstract:he main structure of YZ-XD12 single-boom hydraulic drilling jumbo is introduced' ThePrinciple and structure of its operating mechanisms -drilling boom with range -- changing"double triangle"and dual telescopic propeller are described as well as the hydraulic system.

Abstract:D-50 dril is a new all-hydraulic,top-head drive anchor drill.It has effectively used inboth rock anchor rotary drilling,as well as DTH drilling with simultaneously casing follow in sand and cobbleformations in Beijing. Some problems relating to design,of the drill are described'

Abstract:he drill rig performance testing instrument designed by means of computer technology canmeasure 28 parameters. The technical parameters, realization of the functions and software and hardware designs of the instrument are described.

Abstract:he measurement method of loads (axial, cutting and side loads )exerted on the cutting elementsin the confined conditions is described with corresponding load sensors developed. The water - proof problem ofthe sensors is solved; meanwhile, the effect of high pressure on load sensor accuracry is elimilated by use of theexperimental rating method.

Abstract:he testing device used in rock fragmentation by cutting blades with an attack angle is describedwith the testing results. The leap-load calculation formula is derived' A theoretical analysis is conducted on thetesting results. The factors influencing the difficulty of the cutting blades penetrating rock and those influencingthe level of rock fragmentation specific energy are explored.

Abstract:The structural principle and application of the new gentlration of foundation pile construction equipment is fairly detailed'The equipment includes bored piling equipment and percussive-vibro piling equipment.

Abstract:The design concept of the hydraulic system of MD-50 drill and the selection criteria of the mainhydraulic elements are described. Some experience drawn during design of the hydraulic system of the all -hydraulic system is presented.