Abstract:Raked anchor construction of a diaghragm is taken as an example to deseribe the constructionprocess of raked anchor piles,which mainly include:design of raked anchor;selection of construction equipmentand design of drilling tools;construction process of grouting.

Abstract:A deseription is made on the main features and the functions of every component of the essentialuni-axial tesing system of a new generation computor-controlled rock material tester-MTS815,which was importedfrom U.S.A.

Abstract:Anti-collapse problems and anti-collapse strength calculations of geological bubings are systematicallydiscussed,with number of tables listed for field reference.

Abstract:An alalysis is given the force-bearing condition of the derrick of the top-drive drill rig under ac-tion of the twisting moment exerted by the rotating drill tools and the turn-over moment resulted from pulldownof the feed frame while drilling.

Abstract:Considering the features of Yingshan Tunnel such as large scale,shallow buried,low overburden spanratio,etc.,five measuring sections are set for measurement of horrizontal displacement of the tunnel walls,verticaldisplacement of the arch and ground surface subsidence.The results indicated displacement values far less than the specifid allowances,crating a prequalification for fast,qualified and safty construction.

Abstract:GX-1 silica diluent mainly consists of organic silica.Lignite and stabilizer.It provides excellentdilution,suppression and heat stability,no toxity,no pollution and good compatibility.Obvious benefit is achievedfrom its field use.

Abstract:A comprehensive method to treat waste drilling mud,which employs chemical flocculation,filtrationand consolidation,is presented through experiments.It is ideal for treatment of large amount of waste mud inconstruction drilling.

Abstract:Effective measures of leakage prevention and treatment in shallow gas well drilling are presentedthrough study and test,and have been used in field production.

Abstract:The drilling cost formula is deduced from classification drilling cost components;hence,an ap-proach to reduce drilling cost is presented.It is proposed that economical performance of diamond bits be quan-titatively appraised by use of bit drilling cost.