浅埋偏压破碎围岩隧道施工技术的研究.pdf

分类号:TU410710-2009121029硕士学位论文浅埋偏压破碎围岩隧道施工技术研究徐世康导师姓名职称杨晓华教授申请学位级别工学硕士学科专业名称岩土工程论文提交日期2012年4月25日论文答辩日期2012年6月6日学位授予单位长安大学Study on Construction Technology of Shallow Buried Bias Broken Wall Rock TunnelA Dissertation Submitted for the Degree of MasterCandidate:Xu ShikangSupervisor: XiaohuaChang’an University,Xi’an,Chinai摘要在山岭隧道修建过程中,隧道偏压是一种常见的不良地质现象,如果隧道偏压处治不当,不仅会造成隧道工期的拖延,带来巨大的经济损失,而且可能引发次生隧道病害,严重威胁隧道建设者的人身安全。针对隧道偏压问题,论文主要着重下面几个方向进行了研究:(1)查阅相关资料总结浅埋偏压隧道的特点、判断方法以及偏压隧道的围岩受力分析。(2)对隧道现场典型断面监控量测数据进行分析,并结合实测的水平收敛值和拱顶沉降值,利用位移反分析程序BMP90,进行位移反分析得到等效弹性模量和侧压力系数等围岩参数。(3)运用ANSYS有限元分析软件,利用反分析得到的弹性模量参数对隧道开挖过程进行数值模拟,获得隧道浅埋偏压段在不同开挖过程中围岩应力、应变状态及支护结构受力变化情况,比选出适合该偏压隧道的施工方法并给出浅埋偏压隧道施工的技术要点。(4)针对该隧道偏压段在施工过程中发生的隧道病害,从地形、地质因素及施工因素分析了出现该病害的原因,在总结现有经验的基础上,给出了处理偏压隧道病害的技术方案,以便为类似条件下的隧道病害处治提供参考。关键词:浅埋偏压隧道,监控量测,位移反分析,数值模拟,病害处治iiAbrstructDuring the construction of the mountain tunnel, the tunnel bias is the common bad geological phenomenon. If the bias is not treated properly, it will lead to the default of the construction time, and the big loss of the economy. Moreover, it would lead to the second-time diseases and the threat of the life for the construction people. As to the problem of the tunnel bias, the main research points are as follows:(1) Making the summary on the characteristics, the judgment method and the analysis of the surrounding rock of the shallow bias tunnel by referring to the related materials;(2) As for the spot typical surface, this paper makes analysis for the monitoring measurementfigure. bined with realistic measured horizontal convergence value and the sedimentation valueof the vault, with the displacement back analysisprogram, it gets the soil parameters, as the equivalent elastic modulusand the side pressure coefficientby the back analysis of the displacement;(3) With the elastic modulusthat is resulted from the back analysis, it makes the numerical simulationfor the process of the excavation, it gets