矿渣型泥石流发育特征及危险性评价.pdf

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1、JournalofEngineeringGeology工程地质学报1004—9665／2009／17(3)-0415-06矿渣型泥石流发育特征及危险性评价邓龙胜范文熊炜闫芙蓉(长安大学地质工程与测绘学院西安710054)摘要大西岔沟地质环境复杂，节理、裂隙发育，在各支沟及主沟中，填埋了36万多方以碎石土为主的高、陡矿渣堆。这些矿渣以台阶状层叠堆放的形式填满整个沟谷，严重堵塞水路，并且矿渣堆的稳定性较差，透水性较好，再加上暴雨雨量大，汇流集中，大西岔沟已具备了泥石流灾害爆发的条件。结合洪峰流量对大西岔沟泥石流的启动条件进行分析，极容易发生泥石流。对于像大西岔沟的这种矿

2、渣型泥石流，其主要形成水石流，具有固体物源补给方量大、产流区集中、容易启动、流通距离短和破坏性大的发育特征，其固体物质补给主要以冲、洪沟的侧蚀、揭底补给、渣堆失稳和坡面漫流冲刷补给为主。在此基础上，提出了以排导和固渣相结合的治理方案，即在沟谷中修建大量的排水沟，能第一时间排走洪水，同时对渣堆进行放坡处理，以增加渣堆的自稳能力。关键词矿渣泥石流颗粒分析稳定性启动条件补给方式防治方案大西岔沟中图分类号：P642．23文献标识码：ADEVELoPMENTFEATURESANDRISKoFINDUCINGSLAGDEBRISFLoWATDAXICHAGULLYDENGLon

3、gshengFANWenXIONGWeiYANFurong(SchoolofGeologicalEngineeringandSurveyingEngineering，ChanganUniversity。an710054)AbstractTheDaxichagullyhasacomplexgeo—environmentandhavedevelopedplentyoffissures，cranniesandpiledupmorethan0．36millionmofslag．Theslagismainlyconstitutedofreducedstones．Theslag

4、piledintheformoflayeredterraces，stoppedthedrainagechannelsoffloodbadly．ItisinstabilityIhadwellpermeability．TheabundanceofstormrainfallinthisregionfurthermakestheDaxichagullybecomeagullyofhighlypotentialoccur-ringdebrisflows．Thispaperfurtherusethefloodfluxtoanalyzethestart—upconditionof

5、debrisflows．ItisfoundthatthedebrisflowcanbeeasilyinducedinDaxichagully．Theslagdebrisflowswouldbemainlywaterandstonedebrisflows．Theyhavethecommoncharactersoflargeandconcentratedsolidresources，start—upeasyandshottraveldistance，andseriousdestructive．Theslagdebrisflowswouldbesuppliedwithth

6、eslagthatarecorodedandwashedfromthesideslopesandbottomofthegulley，instabilityslagpilesanditssHrface．Thepapersuggestsaschemeofcombinationthedrainageandsteadyslagtopreventtheoccurrenceofdebrisflows．Asystemofdrainageditchesshallbebuihinthegullytodirectouttherainwaterintime．Theslopeangleso

7、ftheslagpilesshallbere—ducedtoenhancetheirstability．KeywordsSlagdebrisflow，Gradinganalysis，Stability，Conditionofstart—up，Supplymodel，Preventionscheme-Daxichagully+收稿13期l2008—04—08；收到修改稿日期：2008—06—13．第一作者简介：邓龙胜，主要从事岩土工程方面研．Eail：deng32120@yahoo．COIl1．cn416Journa／ofEngineeringGeology工程地