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1、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
2、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
3、文献标识码:AStudyofunifiedstandardofrockyandsoilsurroundingrocksub-classificationinroadtunnels1211WANGMing-nian,CHENWei-tao,LIUDa-gang,TONGJian-jun(1.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China;2.HydroChinaChengduEngineeringCorporationCH
4、IDI,Chengdu610072,China)Abstract:TheimplementaryCodeforDesignofRoadTunnel(JTGD70-2004)can’tsatisfytherequirementofdesignandconstructionsometimesduetonostudyofsoilsurroundingrockclassificationandsub-classificationmethods.Afterascertainingthebuildingfoundationofs
5、urroundingrocksub-classificationstandardinroadtunnel,ithadbeenconstitutedthroughlotsoftest,numericalcalculationandtheoreticalanalysis.Theresearchesshowthatself-stabilityspanissyntheticalreflectionofsurroundingrockstability,sosub-classificationstandardcanbeconst
6、itutedbasedonit.Surroundingrockself-stabilityspancandivideintolong-termstabilityspan,basicstabilityspan,temporarystabilityspanandinstabilityspan.ⅢclassofRockysurroundingrockincriterioncandivideintotwosub-classificationaccordingassurroundingrockstability,threefo
7、rⅣclassandtwoforⅤclass.Thoughsoilsurroundingrockincludeclayeysurroundingrock,sandysurroundingrockanddebrissurroundingrock,theirstabilitycanbeunified.Theuniformstandardofrockyandsoilsurroundingrocksub-classificationbuiltbyself-stabilityspanhasrationalityandinher
8、itance.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[5-6]根据宏观、微观特征及表现的力学特征,隧道了围岩级别的统一分级标准;普氏分级、法国围岩