不同三维应力条件下硬岩巷道围岩的破坏特征及能量分布  

Failure characteristics and energy distributions of surrounding rock in hard rock tunnels subjected to different three-dimensional stress conditions

作　　者：陶明[1] 赵瑞 赵华涛 王一清 曹文卓 王少锋[1] Ming TAO;Rui ZHAO;Hua-tao ZHAO;Yi-qing WANG;Wen-zhuo CAO;Shao-feng WANG(School of Resources and Safety Engineering,Central South University,Changsha 410083,China;Royal School of Mines,Imperial College,London,United Kingdom)

机构地区：[1]中南大学资源与安全工程学院,长沙410083 [2]Royal School of Mines,Imperial College,London,United Kingdom

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第11期3487-3502,共16页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.12072376);the Fundamental Research Funds for the Central Universities of Central South University,China(No.2020zzts708).

摘　　要：为了研究开挖巷道围岩在不同三维应力条件下的破坏特征,采用TRW3000岩石真三轴电液伺服试验系统对含圆孔花岗岩试件进行三轴加载试验,并利用微型高清摄像系统实时记录圆孔附近的失效过程。结果表明,低应力条件下,圆孔内壁主要发生层裂破坏;高应力条件下,圆孔周边主要发生岩爆破坏。增加水平方向的应力可以抑制围岩发生岩爆。进一步数值模拟不同应力条件下圆孔周边的应变能密度(SED)演化过程。模拟结果表明,随着水平应力的增加,圆孔周边的SED分布逐渐减小;圆孔周边SED分布与实验记录的损伤分布基本一致,主要表现为蝶形、耳形和环形分布。To study the failure characteristics of surrounding rock near an excavated tunnel under different three-dimensional stress conditions,a TRW3000 rock true triaxial electro-hydraulic servo mutagenesis testing system was used to conduct triaxial loading experiments on granite specimens with a circular hole.A high-definition micro-camera system was used to record the failure process near the circular hole.The results show that spalling failure occurs near the holed specimen under low-stress conditions,and rockburst appears around the holed specimen under high-stress conditions.Increasing the horizontal stress can prevent the occurrence of rockburst.The evolution of strain energy density(SED)in the surrounding rock of the holed specimen under different stress conditions was simulated.The findings show that the distribution of SED around the circular hole decreases with an increase in horizontal stress.The SED distributions around the circular hole are basically consistent with the damage distributions in the experiments,namely,butterfly-shaped,ear-shaped,and ring-shaped.

关 键 词：深部硬岩巷道 真三轴试验 水平应力差 破坏特征 能量分布 

分 类 号：TD322[矿业工程—矿井建设]