地震作用下顺层岩质边坡稳定性的拟静力分析_李维光

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EquivalentStaticStabilityStudyonRockMassBedding SlopeunderBlasting

LIWeiguang,ZHANGJichun1,21

(1.CivilEngineeringSchool,SouthwestJiaotongUniversity,Chengdu610031,China;

2.CaotangSchool,SichuanNormalUniversity,Chengdu610072,China)

Abstract:Therockmassbeddingslopewasconstantlymetintheconstructionofopenpit,railway,highwayetal,andyieldedseriousdamage.Theslopestabilityunderblastinghasbeencontinuallyconcernedathomeandabroad.Basedontheanalysisactingforcesoftheslopeslice,acalculationmethodofsafetycoefficientontheslopestabilitywasgivenaccordingtothedefinitionofsafetycoefficientandMohr-Columncriteria.Thereliabilityofthemethodwasverified.Therelationbetweenpseudo-staticcoefficientunderblastseismconditionandsafetycoefficientonrockmassbeddingslopewasexplained.Theresultsshowthatthegreatestactingforceswerehorizontaldynasticloadandverticaldynasticloadaswellastheircombineddynasticloadbythecomputedresultsinsomeengineeringcase,es-peciallythelasttwoforces.Therelationbetweenhorizontaldynasticloadpseudo-staticcoefficientandthesafetyco-efficientaswellasverticaldynasticloadp

seudo-staticcoefficientandthesafetycoefficientwasStypeandnegativeexponentialfunction.Whenhorizontaldynasticloadpseudo-staticcoefficientwasadded0.05from0,thesafetycoef-ficientwhichthecrackedlengthwaszeroand9.71mto12.76mwasrespectivelyreduced7.79%to10.67%and

7.61%to10.55%.Whenverticaldynasticloadpseudo-staticcoefficientwasadded0.05from0,thesafetycoeffi-cientwhichthecrackedlengthwaszeroand9.71mto12.76mwasrespectivelyreduced1.28%to1.98%and

1.47%to2.29%.Meanwhile,theslopelength,thecrackedlength,theactingdirectionofc1ombinedloadaffecttheslopestability.

Keywords:Pseudo-staticanalysis;rockmassbeddingslope;blasting;safetycoefficient