Abstract:Difficulties are fetched in excavation of No.2 and No.3 large scale tunnels of Anchu highway,becausethey are all excavated in fractured formations.For keeping successfull progess,tunnelling techniques of light shocking,weak explosion,short step facedrift,arch prior to wall forming,supporting by long pipe shieldd vs pregroutingcombining with grid arch steel,and rock measuring technology,supportting techniques,of spraygrouting-anchoring-netting-spraygrorting are used.

Abstract:Methods of tunnel excavation in unconsolidated formations and the collapse zone treatment are intro-duced according to the formation properties fo exit section of Yangzong No.1 Tunnel.

Abstract:The cross section of Beijing Yingshan Mountain tunnel is superlarge scale supershallow overburden,by using of positive step are guiding adit excavation on method are both satisfactory in effect and cost.the measures are using New Austrian New Austrian Method Principle as the guide;Medium part soil is left for supporting in upperstep excavation,double pilot hole excavation is conducted at lower step the excavation surface is widened and heightened and fixed by anchor rod,etc.

Abstract:The circumstances of using country rock deformation data,which come from monitoring technology,to guide the excavation and guarantee the safety,with the country rok monitoring data of No.2 and No.3 tunnelsof Anchu highway as bases and with the side slopewalll of entrance and exit and k75+430 section for mtances.

Abstract:Tunnel excawition methods have been studied from theories and practices.And conditions of usageand advantags of three methods have been discussed,these are:total cross section method,step method and guidinghole method,as well as the main factors in selecting excavating methods.Suggestions on populariring latest technolo-gy,technique and strengthenning management in tumsel excavation of MGMR have been put forward.

Abstract:It has obvious effect by using static pressure technology for setting of prefabricated pile in softfoundation improvement.Self-made static prissure pile driver meets the requirements of pile construction.Manufacturing technique of steel reinforced concrete square pile,main point of prefabricated pile static pressure construction method and measures of quality guarantee are summed up from practical works.

Abstract:The main way of geo-engineeringdriling used in subsidence control,and reinjection wellconstruction techniques are introduced combining withthe effective situation of ground subsidence control inTianjin.

Abstract:Through comparison of DTH hydro-hammer with hydraulic rock drill,two ideas are presented:(1)Thedevelopmetn of DTH hydro-hammers can be refered to the features of high hydraulic dressure,lowflow rate and high avilability engergy coefficiency of hydraulic rock drills;(2)The liquid spring property of drilling fluid playsan important role in improving the improving the operating performance of hydro-hammers.

Abstract:This drill are used for drilling medium and slight-weathered tufflave in Xiamen,diameter of pile holeis 1000mm,maximum depth is 47.56m.Percussive-rotary reverse circulation drilling is used to solve the problems,which could not be solved by using rotatary drilling,meanwhile suggestions on improving this drill are put intlforth.

Abstract:The nccessity and urgency of PDCbit downhole folw field testing are demonstrated according to the character of PDC bit structure,principle of rock fracturing and circumstances of using in drill sites.Combining withforeign informations ,an instrument was designed for PDC bit with single nozzle testing,Also used for downholeover flow characteristic and full gauge bit downhole fluidic rule experiments.This instrument realizedthreedimensional measurement of downhole folw field characteristics.

Abstract:Optimisation drilling constant parameter(h/p)/q has been selected,acoording to this parameter,optimal bit has been selected for corresponing,and penetration rate for revolation has with the optimal bitare alss diseussed.

Abstract:The best formula of this agent is selected out through orthogonal test and volume proportional test.Three times of successful plugging in two holes in Pingdingshan gold mine show that this aagent is a kind of quick flocculation plugging agent.

Abstract:Using full sized core barrel tobe inclination prevention tool in water well engineering is effective,and the structure of the tool and the case history of the application are introduced.