摘要
为了探讨深埋地下洞室在岩体自重应力作用下的岩爆破坏特征,采用自主研制的岩爆模型试验装置进行了室内模型试验,分析了洞室岩爆的宏观破坏现象及围岩的应变特征;在此基础上通过数值计算方法模拟分析了不同侧压系数对深埋洞室岩爆破坏过程及破坏区域的影响。研究结果表明:洞室围岩在加载过程中的变形规律基本呈对称状态,侧压系数λ为1/3模型试验,洞室侧壁部位是发生岩爆破坏的主要区域,其破坏范围约为20%的洞室直径,模型试验的宏观破坏范围与数值计算的破坏区域及影响范围基本一致;当侧压系数λ发生改变,深埋洞室发生岩爆破坏时的荷载和区域也随之变化,洞室发生破坏时的临界荷载随λ的增加而增大;当λ为1/3和1/2时,破坏区域主要集中于洞室两侧壁;当λ为1时,破坏区域集中于洞室顶部,并由洞顶向洞壁扩展。采用物理模型和数值分析相结合的方法,进行不同应力状态下的岩爆破坏特征研究具有一定的可行性。
In order to investigate the rock burst failure characteristics of the deeply buried caverns under the rock mass with various rock stresses,a series model tests were conducted by using an in-house developed rock burst model test device.The macroscopic failure phenomenon of the rock burst and the strain of surrounding rock were evaluated.In addition to the model tests,the influence of different lateral pressure coefficients on the rock burst failure mechanism and the failure zone of rock mass were numerically simulated and analyzed.The results show that the deformation pattern of the surrounding rock of the cavern is basically symmetrical,when the lateral pressure coefficientλis 1/3,the both walls of cavern are the main areas where the rock burst failure occurs,and the failure range is about 20%of the cavern diameter.The macroscopic failure zone ranges of the model tests were generally consistent with the numerical analysis obtained failure zones and the influence ranges.With the change of the lateral pressure coefficientλ,the rock burst failure area of the deeply buried cavern also changed and the critical load when the rock burst breaks increased with the increase ofλ;whenλ=1/3 andλ=1/2,the failure area was mainly concentrated on the both sidewalls of the cavern;whenλ=1,the failure area was concentrated on the crest of the cavern,and extends from the crest to the toe of the side walls of the rock cavern.The paper concluded that it is feasible to study the mechanism of rock burst failure under different stress states by the combination of the model tests and numerical analyses.
作者
项戈泽
祝文化
刘畅
王智德
夏元友
XIANG Geze;ZHU Wenhua;LIU Chang;WANG Zhide;XIA Yuanyou(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070)
出处
《土工基础》
2019年第5期579-583,共5页
Soil Engineering and Foundation
基金
高等学校博士学科点专项科研基金(20110143110017)
中央高校基本科研业务费专项资金资助项目(2014-IV-150)
关键词
隧道工程
岩爆
洞室
侧压系数
模型试验
数值模拟
Tunnel Engineering
Rock Burst
Underground Cavern
Lateral Pressure Coefficient
Model Test
Numerical analysis
