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:10012831X(2003)0120009203PERTX,(,210007):,PERT,,,:PERT;;:TP391.9;TU94:A,,,,,(CriticalPathMeth2od),,,(ProgramEvalu2ationandReviewTechnique),PERT,,,,(),,PERTPERT3PERT,,,()1PERTPERT,,,,,,;();()111PERT,,:(a,b),;,f(x)=(r+s)(B-A)r+s-2(r)(s)(x-A)r-1(B-x)(s-1)(1)23120033UNDERGROUNDSPACEVol.23No.1Mar.2003X:2002207216:(19772),,,,©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.AFxFB,r0,s0,A,BM,,AB1%(1):E(x)=A+(B-A)rr+s(2)D(x)=(B-A)2rs(r+s)2(r+s+1)(3)PERT(A+4M+B)P6(B-A)2P36A+4M+B6=A+(B-A)rr+s(B-A)236=(B-A)2rs(r+s)2(r+s+1)(4)A,B,M,(4),,11112,i(1)BTi(BTi)2BTi,i:j,i=1BTi=0;(BTi)2=0;BTi=max{BTj+te};{(BTi)2=(BTj2+(e)2;te,(e)2(2)LTi(LTi)2LTn=BTn,(LTi)2=0;n,j,LTi=min{LTj-te};(LTi)2=(LTj)2+(e)2;te,(e)2(3)DTi(DTi)2:DTi=LTi-BTi;(DTi)2=(LTi)2+(BTi)2,DDTi/DTiZ113PERT2PERT2,,,amb10123©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1ABCDEFGHIJKLMNPAABBCDGEIHFLJ1K1MNa42.50.52.50.50.53.52.50.5530.50.52.51.5m531311431641132b63.51.53.51.51.54.53.51.5751.51.53.52.5,:3100,:44615,2815,3317,2:2ABCDEFGHIJKLMNP110100110010011:12368101213143PERT,,,,PERT,,,PERT:[1],1[M]1:,19961[2],1[M]1:,19951[3]1[M]1:,19961[4]1[M]1:,200111120021:PERT©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.UNDERGROUNDSPACEVol.23,No.1(SerialNo.93)QuarterlyMarch,2003CONTENTS&ABSTRACTSDESIGN,CONSTRUCTION,MONITORINGApplicationofPre2splittingBlastingTechnologyintheCuttingSlopeQIUXian2deetal.(1)[Abstract]Basedonmanyin2situexperimentsofpre2splittingblasting,theapplicationofpre2splittingblastingtechn2ologyincuttingslopeisstudiedinthispaper.Accordingtothein2situexperimentsandgeologicalconditions,theblastingschemeswereoptimizedandexcellentblastingeffectswereachieved.Thispaperwouldhavegreatdirectivesignificancetotheexcavationofcuttingslopesandgiveobvioussocialandeconomicalbenefits.[Keywords]pre2splittingblasting;blastingparameters;cuttingslopeComparisonofTechniquesforGeologicalPredictionofTunnelsCHENJian2feng(4)[Abstract]Duringtunneling,theprecisepredictionofrockpropertiesaheadthetunnelfacecaneffectivelypreventtheengineeringaccidents,improveconstructionprogressandassuretheprojectquality.Theappliedmethodsofgeo2logicalpredictionfortunnelsaresummarizedintocrackmethodsandnon2crackmethodswiththeiradvantagesanddis2advantages.Amongnon2crackmethods,theTunnelSeismicPrediction(TSP)hasspecificadvantagessuchaslongpredictiondistance,lowpredictionfeeandshortoperationtimeetc.Inthispaper,theTSPprinciplealongwiththesystemofdataacquisitionandanalysisisintroduced.SomesuccessfulapplicationsofTSPintunnelconstructionarelistedintheend.[Keywords]tunnel;prediction;geology;seismicwave;TSPSimulationofPERTinDesignofConstructionManagementforUndergroundEngineeringHAOYu2longetal(9)[Abstract]Thedesignofconstructionmanagementinundergroundengineeringisacomplicatedmultifactorsystem.Inthispaper,howtosimulateaPERTnetworkmodelofconstructionschedulewithcomputerisdescribedinordertogettheprobabilitydistributionofprojecttimelimit,workingprocedureoncriticalpathetc,whichcanbeusedtoarrangeaprojectwiththeshortesttimeandresources.[Keywords]PERT;undergroundengineering;constructionplanTHEORYANDEXPERIMENTALSTUDYFEAonFeasibilityoftheSupportingbyEnclosingPileswithPre2stressedAnchorZHUHe2huaetal(12)[Abstract]Ingeotechnicalandundergroundstructuralengineering,undersomeloadingconditionsthesoilbodyincontactwiththeprestressedanchorandenclosingpilesmaybecrackedorslip.Inordertoexpresssuchloadingchar2©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.