浅埋偏压隧道支护时机对围岩稳定性影响分析  

Effect of support timing on stability of shallow tunnel with unsymmetrical loading

作　　者：贾月卿 王建平 熊小锋 邵珠山[1] JIA Yue-qing;WANG Jian-ping;XIONG Xiao-feng;SHAO Zhu-shan(College of Civil Engineering,Xi‘an University of Architecture and Technology,Xi’an 710001,China;The 1st Engineering Co.,Ltd.of China Railway 12th Bureau Group,Xi’an 710038,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710001 [2]中铁十二局集团第一工程公司,陕西西安710038

出　　处：《广西大学学报（自然科学版）》2018年第2期665-675,共11页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(10772143)

摘　　要：随着我国西南部大规模铁路建设的实施,受地形地势的影响,浅埋偏压隧道越来越多的出现在工程实际当中。对于此类隧道,初期支护时机对围岩稳定性的影响是一个不容忽视的重要问题。针对改建铁路成昆线老鼻山隧道洞口浅埋偏压段的工程实例,应用大型有限元分析软件ABAQUS模拟分析了隧道开挖后在不同应力释放率情况下施加初期支护的作用效果。对浅埋偏压隧道不同支护时机下围岩的变形规律以及围岩的应力状态进行了研究,初步分析了两者与支护时机的对应关系。With the large-scale railway construction in the southwest of China,more and more shallow-buried unsymmetrically loaded tunnels have appeared due to the influence of the landscape.For such tunnels,initial support timing is an important problem that cannot be ignored for the stability of the surrounding rock.This work studied is based on the shallow buried and unsymmetrically loaded portal section of the Laobishan tunnel.The effect of the initial support under different stress release rates after the tunnel excavation is analyzed by ABAQUS,the finite element software.The deformation and stress state of the surrounding rock are studied to analyze the relation between them and the support timing.

关 键 词：浅埋偏压隧道 支护时机 应力释放 围岩变形 

分 类 号：TU94[建筑科学—建筑技术科学]