第31卷第2期岩土力学Vol.31No.22010年2月RockandSoilMechanicsFeb.2010文章编号：1000－7598(2010)02－0547－06公路隧道岩质和土质围岩统一亚级分级标准研究1211王明年，陈炜韬，刘大刚，童建军（1.西南交通大学土木工程学院，成都610031；2.中国水电顾问集团成都勘测设计研究院，成都610072）摘要：目前实施的《公路隧道设计规范》（JTGD70－2004）对土质围岩分级、围岩亚级分级方法都没有进行研究，因此，不能满足隧道设计和施工的要求。通过对岩质围岩和土质围岩自稳性的大量室内试验、数值计算和理论分析，建立了公路隧道岩质围岩和土质围岩统一的亚级分级标准。研究结果显示：围岩自稳跨度是围岩自稳性的综合反映，围岩自稳跨度可分为长期稳定跨度、基本稳定跨度、暂时稳定跨度和不稳定跨度。研究表明，规范中岩质围岩的Ⅲ级、Ⅳ级和Ⅴ级分别依据自稳跨度可分为2个、3个和2个亚级；土质围岩尽管分为黏质土围岩、砂质土围岩及碎石土围岩，但按照各自的自稳跨度可以分别进行亚级划分。可见，以自稳跨度可以建立岩质围岩和土质围岩统一的亚级分级标准。关键词：公路隧道；亚级分级；自稳跨度中图分类号：U451文献标识码：AStudyofunifiedstandardofrockyandsoilsurroundingrocksub-classificationinroadtunnelsWANGMing-nian1,CHENWei-tao2,LIUDa-gang1,TONGJian-jun1(1.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China;2.HydroChinaChengduEngineeringCorporationCHIDI,Chengdu610072,China)Abstract:TheimplementaryCodeforDesignofRoadTunnel(JTGD70－2004)can’tsatisfytherequirementofdesignandconstructionsometimesduetonostudyofsoilsurroundingrockclassificationandsub-classificationmethods.Afterascertainingthebuildingfoundationofsurroundingrocksub-classificationstandardinroadtunnel,ithadbeenconstitutedthroughlotsoftest,numericalcalculationandtheoreticalanalysis.Theresearchesshowthatself-stabilityspanissyntheticalreflectionofsurroundingrockstability,sosub-classificationstandardcanbeconstitutedbasedonit.Surroundingrockself-stabilityspancandivideintolong-termstabilityspan,basicstabilityspan,temporarystabilityspanandinstabilityspan.ⅢclassofRockysurroundingrockincriterioncandivideintotwosub-classificationaccordingassurroundingrockstability,threeforⅣclassandtwoforⅤclass.Thoughsoilsurroundingrockincludeclayeysurroundingrock,sandysurroundingrockanddebrissurroundingrock,theirstabilitycanbeunified.Theuniformstandardofrockyandsoilsurroundingrocksub-classificationbuiltbyself-stabilityspanhasrationalityandinheritance.Keywords:roadtunnel;surroundingrocksub-classification;self-stabilityspan岩统一的分级标准。如我国的铁路、公路隧道围岩1引言分级以自稳性（自稳跨度、塌方情况等）指标建立