壩坡基坑巖土非線性壓力破壞下應(yīng)力敏感性試驗(yàn)研究

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GAO Jing， ZHANG Qi

（The Third Geological and Mineral Investigation Institute of Henan Bureau of Geology and Mineral Exploration and Development， Zhengzhou 45OOOO，China）

Abstract：Takingtherockandsoilofareservoirdamfoundationpitastheresearchobject，astresssensitivitytestwas conductedontherock and soilofthedam slopefoundation pitundernonlinear pressurefailure.Basedonthe indicatorsof rock andsoilpermeabilityndpermeabilitycoeficient，thestresssensiviyoftherockandsoilinthedamslopefoundationpitis analyzedusing nonlinearfailurerules.Theresultsshowthatthenonlinearparametersofrockandsoil haveasignificantimpact onthebearingcapacityof thefoundationpitofthedam slope.Asthecurvaturecoeficientoftherockandsoil increases，the bearingcapacitycoeffient graduallydecreases.Amongthem，thesevere influencecoefficientisnotsensitivetotheultimate bearingcapacityoftherockandsoil；Thepermeabilityisdirectlyproportionaltotheinternal pressureoftheporefluid，and whentheconfining presureishigh，thepermeabilityof therockandsoilislessafectedbytheinternal pressreand less sensitive to stress.Onthecontrary，whentheconfining pressureislow，thestresssensivityoftherockandsoilisstronger； Atdiferentstagesofconfining presure，thesensitivitycurveof permeabilitycoeffcient tochanges inrock contentshowsan overalltrendofirstdecreasing，thenincreasing，andthendecreasingwiththeincreaseofrockcontent.Whentherock content is 60% ，thesensitivityofrockandsoil permeabilitycoeficient tochanges inrock content isthehighest，and thestress sensitivity isthe highest.

Keywords：rock andsoil of dam slope foundationpit；non linear presure；confining pressuretest；presure bearingsensitivity； sensitivity coefficient；permeability

0 引言

大壩具有蓄水、防洪、發(fā)電等功能[1]，其中土石壩是應(yīng)用最廣泛的壩型。（剩余5255字）