半硬半软岩隧道塌方的力学特性及处理方法分析.pdf

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1、工程地质学报1004—9665／2009／17(2)-0263-05半硬半软岩隧道塌方的力学特性及处理方法分析喻军刘松玉童立元(东南大学交通学院岩土工程研究所南京210096)摘要由于蛟岭隧道出口横断面一半为硬岩，结构完整，而另一半为软岩，为风化岩层，且较为破碎，所以在隧道开挖时，硬岩一侧刚度较大，变形较小，自稳能力大；软岩一侧与之相反，遇水软化，流变性明显，所以在软硬岩交界面处，产生滑移，导致塌方，从而在软岩一侧采取了地表加固和掌子面管棚注浆的处理，形成了与硬岩接近的强度，使隧道周围形成一个承载环，并对处理段进行了监测，监测数据分析表明处理后迅速达到稳定。关键词

2、半硬半软岩隧道塌方管棚注浆地表加固蛟岭中图分类号：U452．11文献标识码：AMECHANICALCHARACTEIUSTICSANDTREATMENTMETHoDoFCoLLAPSEoFTUNNELWITHHALF—HARDANDHALF—SoFTRoCKSALoNGITSTRANSVERSESECTIoNYUJunLIUSongyuTONGLiyuan(InstituteofGeotechnicalEngineering，TransportationCollege，SoutheastUniversity，Nanjing210096)AbstractTheJia

3、olingtunnelinconstructionencounteredtwotypesofrocksalongitstransversesection．Half0fthetunnelsectionishard—rockwhiletheotherhalfissoftrock．ThehardrockiSintactandhasa40MPacom．pressivestrength．Thesoftrockisweatheredandfracturedandhasacompressivestrength5MPa．Collapseatthesideofsoftrocktoo

4、kplaceduringtheconstruction．Mechanicalcharacteristicsforthehardandsoftrocksandthecollapsereasonswereanalyzedattheportalofthelefttunnelline．．Thencounterpartcollapsetreatmentswereem-ployed．Forexample，surfacewithgroutingreinforcementandtube—groutingframewereexplained．Strengthofthetreated

5、softrockwasalmostequaltothatofhardrock．Bearingloopwasmadeupoftreatedsoftrockandhardrock．Atlastthetreatedzonewasmonitored．Itwasjudgedfrommonitoringdatathatthezonewasstablequickly．So，thistreatmentmethodisreasonableandefective．Thebearinglooptheorycanbeusedtothehalf—hardandhalf—softrocktr

6、ansverse—sectiontunne1．Newideainthepaperisthesuspensiontheoryapplicabletoboltingandgrouting—tubetreatmentofsoftrocktunne1．Thistheorycanimprovetheefectivenessofboltreinforcingsoftrocktunne1．Thisconclusioninthepaperisusefulfordesignandconstructionoftunnelinhalf—hardandhalf—softrock．Keyw

7、ordsHardrock，Softrock，Rocktunnel，Collapse，TubeflameIGrouting，Surfacewithgroutingrein—forcement，Jiaoling收稿日期：2008一叭一22；收到修改稿日期：2008—05—05．第一作者简介：喻军，主要从事隧道及地下工程的施工和研究．Email：yujunsunny@163．conlJournalofEngineeringGeology工程地质学报2009状，下部土层为软可塑，呈蠕动状松散结构，同时，残1引言坡积土层内夹有大块、巨状孤石。土层内饱含孔隙水，岩层内充满裂隙

8、水，土、石