考虑卸荷时间的深埋巷道附近破坏特性研究  

Investigation of characteristics of failure nearby deep tunnel considering unloading time

作　　者：钱岳红[1,2] 李杰[1] 陈文涛[1] 李文培[1] 

机构地区：[1]解放军理工大学工程兵工程学院 [2]解放军92303部队

出　　处：《岩土力学》2011年第5期1347-1352,共6页Rock and Soil Mechanics

基　　金：国家自然科学杰出青年基金(No.50825403);国家自然科学创新研究群体科学基金(51021001);国家重点基础研究发展计划(973计划)项目(No.2010CB732003)

摘　　要：巷道开挖卸荷即巷道附近围岩应力重分布,卸荷速率影响应力场,开挖卸荷本质上是动力问题。根据弹性力学知识并假定卸荷过程符合时间参数t 0的函数,基于Hamilton原理,获得考虑卸荷时间的巷道附近应力场演变规律。系统概括不同埋深条件下巷道附近应力场特征,并针对深埋巷道地应力较围岩强度大的特点,详细地分析考虑剪切及拉伸破坏时巷道附近破坏特征。结果表明,自巷道壁由近及远出现以剪切破坏、未破坏、拉伸破坏为主要特征的现象,也即以"剪切破坏+未破坏+拉伸破坏"为主要特征的状态是巷道附近可能破坏模式之一,并且该现象与围岩性质及卸荷时间相关。Unloading is the same with that of redistribution of surrounding rock＇s stress when excavating;and the unloading velocity affects stress field,so the problem of unloading is a dynamic one essentially.Assumed the unloading ruled by a simple function characteristic of the time parameter and based on the elastic mechanics and the Hamilton principle,the regulation of the stress field nearby the tunnel is obtained.The stress fields around the carvity in different depths are generalized.Especially when the in-site stress is larger than the rock strength,the characteristics of the failure nearby the tunnel are analyzed considering the shear failure and tensile failure.The results show that the main mode of the shear failure,intact and tensile failure occurs from the tunnel.In other words,the characteristics of the shear failure,intact and tensile failure is one of the likely failure modes.The situation is concerned with the unloading time.

关 键 词：深埋巷道 卸荷时间 破坏特征 

分 类 号：TU32[建筑科学—结构工程]