基于反分析法的浅埋隧道围岩应力释放率研究  

Study of Rock Stress Release Rate in Shallow-buried Tunnel Based on Displacement-Back-Analysis

作　　者：刘英棨 张谢东[1] 李佳莉[1] 杨笑天[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2015年第6期1259-1261,1269,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：为了便捷快速并准确地计算围岩应力释放率以指导浅埋隧道施工,文中借助监控量测数据,进行回归分析,并预测指定时刻初衬拱圈变形,运用位移反分析法,应用影响线原理,通过Midas/Civil有限元软件反演求得初期支护层间应力,将其与理论开挖围岩压力进行比较,推导了浅埋隧道围岩应力释放率与初衬拱圈位移之间的相关关系.结果表明,最浅埋深断面YK86+685处应力释放率达到48.5%,超出邻近断面25%应力释放水平过多是造成其拱顶掉块的主要原因,将拱圈封闭时机提前5d进行将有效避免类似工况发生.In order to instruct shallow-buried tunnel construction by conveniently quickly and precisely calculated rock stress release rate, with monitoring and measuring in the paper, the regression analysis and the prediction of the arch ring displacement data can be proceed, thus the displacement back analysis and the influence line method as well as the Midas/Civil FEA software can be applied to calculate the inter-laminar stress of the preliminary bracing. Compare the inter-laminar stress with theoretical total excavating stress, the relationship between the arch ring displacement and the rock stress release rate is derived. The results show that, the rock stress release rate at the lowest buried section YK86＋685 is 48.5%, exceeding nearby ones, which is no more than 25%, too much is the main reason that leads to its arch crown＇s failing, if the arch ring were closed five days earlier, the similar dangerous would have been avoided.

关 键 词：隧道工程 围岩应力释放率 位移反分析法 初期支护 浅埋隧道 监控量测 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]