兰渝铁路高地应力软岩隧道变形机理和施工控制精选.docxVIP

2014 年5月第5期(总188)铁道工程学报JOUＲNAL OF ＲAILWAY ENGINEEＲINGSOCIETYMay 2014NO．5(Ser．188)文章编号:1006 －2106(2014)05 －0068 －06兰渝铁路高地应力软岩隧道变形机理和施工控制何春保1舒丽红2(1．华南农业大学，广州510642;2．西安铁路职业技术学院，陕西临潼510507)摘要:研究目的:兰渝铁路二叠系高地应力软岩隧道挤压变形是施工中的突出难题，在施工过程中过对软岩隧道的地质特征、地应力特征、变形特征、支护压力及支护破坏特征等进行监测分析，以便及时掌握高地应力软岩变形机理，确保施工的顺利进行。研究结论:通过研究表明:(1)随着埋深和地应力的增加，初期支护强度、支护结构刚度也应相应增加，否则容易出现坍塌，施工中采用套拱的方法能有效控制变形;(2)对兰渝铁路二叠系软岩大变形不应套用现行分级标准来划分，应结合施工实际确定与之相适应的支护结构及措施;(3)极高地应力对岩体稳定性的影响程度应结合工程实践进行具体分析，边墙及拱腰是施工大变形关键部位，需要及时调整施工参数和加强支护措施来确保施工的顺利进行;(4)本研究成果可应用于指导二叠系软岩隧道结构的设计和施工。关键词:高地应力;软岩;大变形中图分类号:TU473 文献标识码:ADeformationMechanizationandConstructionControlofHighGround Stresses Soft Ｒock Tunnel in Lanzhou －ChongqingＲailwayHE Chun －bao1 ，SHU Li －hong2(1．SouthChinaAgriculturalUniversity，Guangzhou，Guangdong510642，China;2．XianＲailwayVocational＆TechnicalInstitute，Lintong，Shanxi510507，China)Abstract:Ｒesearchpurposes:CrimpofhighgroundstressessoftrockistheprominentproblemsinLanzhou－ChongqingＲailwaytunnel，inordertoensurethesmoothprogressoftheconstruction，thegeologicalcharacteristics，stresscharacteristics，deformationbehavior，supportpressureandsupportingdestructivecharacteristicsofsoftrock tunnelaremonitoredandanalyzed．Ｒesearchconclusions:Themonitoringdataindicatesthat:(1)Theinitialsupportstrengthandsupportingstructure stiffnessmustincreasecorrespondinglywiththeincreaseofinclinedshaftdepthandgroundstresses，otherwisethetunnel iseasytocollapse，andthemethodofusingarchcaneffectivelycontrolthedeformationduringconstruction．(2)The currentclassificationstandardcouldn’tbeappliedinlargedeformationofLanzhou－ChongqingＲailwayPermiansoft rock;itshouldbecombinedwiththeconstructionconditionstodeterminethecorrespondingsupportingstructureand constructionmeasures．(3)Theinfluenceofhighgroundstressonthestabilityofrockmassshouldbecombinedwith theengineeringpracticeanalysis，sidewallandarchwaistarethekeypartsoflargedeformationconstruction，constructionparametersandsupportingmeasuresshouldbeadjustedtimelytoensurethesmoothprogressofthe construc