软岩隧洞可缩性U型钢支架压缩量研究.pdf

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1、水}Ⅱ才<电技术第47卷2016年第5期软岩隧洞可缩性U型钢支架压缩量研究曹瑞琅1，陈德平2，段庆伟1，王玉杰1，赵宇飞1(1．中国水利水电科学研究院流域水循环模拟与调控国家重点实验室，北京100038：2．云南省水利水电勘测设计研究院，云南昆明650021)摘要：以深埋软岩输水隧洞为工程背景，研究了钢支架压缩量的计算方法，提出软岩隧洞钢支架压缩量的控制标准。借助数值软件进行u型钢支架压缩量影响因素的定量分析，研究表明：(1)压缩量设计适当的可缩，}生U型钢支架既能满足深坦软岩隧洞支护“高阻让压”的需要，以保持围岩稳定

2、．又能合理释放掉部分原岩应力，改善衬砌的应力应变状态；(2)确定钢支架压缩量设计值，可根据隧洞支护结构受力状态和图岩塑性区半径划定范围后综合判定；(3)隧洞埋深和围岩类别不仅对U型钢支架压缩量的影响很大，还一定程度上影响钢支架缩动收敛时间，岩体类型和隧洞洞型对U型钢支架压缩量也有较明显的影响。关键词：软岩隧洞；U型钢支架；压缩量；围岩稳定doi：10．13928／j．cnld．wrahe．2016．05．012中图分类号：TV221．2；U451．2文献标识码：A文章编号：1000．0860(2016)05．0049—

3、05StudyonamountofcompressionofyieldableU·steelsupportforsoftrocktunnelCAORuilan91，CHENDepin92，DUANQingweil，WANGYujiel，ZHAOYufeil(1。StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin，ChinaInstituteofWaterResourcesandHydropowerResearch，Beijing1000

4、38，China；2．YunnanInsituteofWaterandHydmpowerEnsineeringInvestigation，DesignandResearch，Kunming650021，Yunnan，China)Abstract：Bytakingthedeep—buriedsoftrocktunnelastheengineeringbackground，thecalculationmethodfortheamountofcompressionofsteelsupportisstudiedherein，a

5、ndthenthecontrolcriterionfortheamountofcompressionofsteelsup—portforthesoftrocktunnelisproposedaswell．Bymeansoftherelevantnumericalsoftware，aquantitativeanalysisismadeoilthefactorstoimpacttheamountofcompressionoftheU·steelsupport．Thestudyshowsthat：(1)theyieldabl

6、eU-steelsuppoawiththeappropriatelydesignedamountofcompressioncannotonlymeetthedemandofthehighresistantandyieldingpropertyofthedeep·buriedsoftrocktunnelformaintainingthestabilityofsurroundingrock，butcanalsoimprovethestress·strainstatusoftheliningbyrelievingaparto

7、fthestressintheoriginalrock；(2)thedesignValuescanbedeter-minedinaccordancewiththestressconditionofthetunnelsupportingstructureandthecomprehensivejudgmentmadeafterdelimitingtherangeoftheradiusoftheplasticzoneofthesurroundingrock；(3)thetunnelburieddepthandthesnn'o

8、／3nd—ingrocktypeshavelargeimpactsnotonlyontheamountofcompressionofthesteelsupport，butalsoOiltheyieldingcon-vergencetimeofthesteelsupporttosomeextent，meanwhilettherock