高陡岩质料场边坡稳定性与支护设计研究.pdf

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1、JournalofEngineeringGeology工程地质学报1004—9665／2010／18(4)-0507-09高陡岩质料场边坡稳定性与支护设计研究赵建军①唐茂颖②巨能攀①霍宇翔①黄润秋①(①成都理工大学地质灾害防治与地质环境保护国家重点实验室成都610059)(②国电大渡河流域水电开发有限公司成都610041)摘要水电站料场高边坡具有高度大、坡度陡、卸荷速度快等特点，因多按临时边坡进行设计，故施工期变形破坏事例频发。基于这一现状，依托瀑布沟水电站两岩质料场边坡，通过两年多跟踪施工过程的支护设计工作，总结出一套操作性强的料场高边坡稳定性及支护设计方法。针对料场边坡

2、存在的受软弱结构面控制的边坡整体稳定性、浅表层块体稳定性、碎裂岩体稳定性三种工程地质问题，在跟踪施工过程开展岩体结构调查的基础上，按照先整体后局部的稳定性评价思路，开展高边坡稳定性评价。施工期动态支护设计按照“保证整体稳定，控制局部变形，顾全潜在失稳区域”的理念，通过定性评价确定不稳定区域并优先设计提交施工；针对施工中最易出现的块体变形和碎裂岩体变形，建立了合理的支护设计原则和严格的施工规定；对稳定性差、施工风险高、支护造价大的潜在不稳定区域，应及时地调整开挖方案，减少工程造价。实践表明，这套方法保证了料场高边坡的快速施工安全，减少了工程投资。关键词料场边坡稳定性评价支护设

3、计岩体结构中图分类号：TU457文献标识码：ASTUDYoNSTABILITYEVALUATIoNANDSUPPoRTINGWoRKDESIGNFoRHIGHANDSTEEPRoCKSLoPEINMATERIALDEPoTSZHAOJianjun①TANGMaoying②JUNengpan①HUOYuxiang①HUANGRunqiu①((~StateKeyLaboratoryofGeohazardPreventionandGeoenvironmentProtection，ChengduUniversityofTechnology，Chengdu610059)(<~Dadu

4、HydropowerD~elopmentCO．，LTD，Chengdu610041)AbstractSlopeinmaterialdepotsforhydropowerstationconstructionisgenerallycharacterizedbygreatheightandgreatslopeangle．Consideringitsusage，thistypeofslopeisusuallydesignedastemporaryslopewith，there-fore，temporarysupposingscheme．Duetotherapidunloading

5、causedbyrockexploration，largedeformationandfailurehappenfrequentlywithinsuchslope．TwoslopesinmaterialdepotsfortheconstructionofPubugouhydro—powerstationinSichuanProvince，China，weretakenasexamplesinthisstudy．Thesupportingschemewereofdy-namicdesign，thatis，thedesignofsupportingworkwaskeptupda

6、tedaccordingtothemonitoringofdeformationintheprogressofrockexploration．Thispaperconcludesthedynamicdesignmethodandflowcha~employedforthesetwoslopesandputsforwardapracticalmethodologyforstabilityevaluationandsupportingworkdesignforsuchslopes．Firstly，threeengineeringgeologicalproblemsaboutth

7、eselectedslopesaresummarized：(1)overallinstabil—itycontrolledbyparticularcombinationofweakdiscontinuities；(2)blockinstability；and(3)instabilityofcataclas—ticrockmasses．Secondly，theoverallslopestabilityisevaluatedfollowedbylocalstabilityevaluationonthebasis收稿日期