摘要
利用UDEC软件对不同层理面倾角层状岩体巷道围岩的变形位移情况进行了模拟,分析了围岩的内部应力分布,提出了不同层理面倾角巷道围岩的变形破坏机制。研究结果表明:相比于均质岩体,层状岩体由于层理面的存在致使围岩的变形破坏特征更加复杂,层理面倾角大小对围岩的破坏失稳模式有显著影响,随着层理面倾角的增大,围岩变形破坏的非对称性逐渐增强。具体表现为沿层理面的垂直方向变形位移最大,当层理面倾角大于60°时,边墙的变形位移显著增大。当巷道开挖后,在地应力诱导和层理面影响的叠加作用下,先是层理面的剪切滑移、离层破坏,逐渐演化成穿过层理面的剪切—拉伸破坏,并最终过渡成基质的拉伸破坏。研究成果对深部层状岩体巷道围岩如何采取有效的加固措施具有理论和现实指导意义。
The surrounding rock deformation and displacement of stratified rock mass roadway with different bedding plane dip angle was simulated by UDEC software,the internal stress distribution of surrounding rock was analyzed,and the deformation failure mechanism of surrounding rock of roadway with different bedding plane dip angle was proposed.The results showed that,compared with homogeneous rock mass,the deformation and failure characteristics of surrounding rock mass are more complex due to the existence of bedding plane,and the dip angle of bedding plane has a significant impact on the failure and instability mode of surrounding rock.With the increase of bedding plane dip angle,the asymmetry of surrounding rock deformation and failure gradually increases.Specifically,the deformation displacement along the vertical direction of the bedding plane is the largest,when the dip angle of the bedding plane is greater than 60°,the deformation displacement of the side wall increases significantly.After t excavation of the roadway,by the superposition of in-situ stress induction and bedding plane influence,shear slip and separation failure of bedding plane first evolve into shear-tensile failure through bedding plane,and finally transition to matrix tensile failure.The research results have theoretical and practical guidance on how to take effective reinforcement measures for deep stratified rock mass roadway.
作者
沙杰
叶义成
姚囝
SHA Jie;YE Yicheng;YAO Nan(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallergic Mineral Resource,Wuhan 430081,China)
出处
《金属矿山》
CAS
北大核心
2023年第12期62-68,共7页
Metal Mine
基金
国家自然科学基金项目(编号:51804224)
武汉科技大学“十四五”湖北省优势特色学科(群)项目(编号:A0303)。
关键词
层状岩体
数值模拟
变形位移特征
破坏机理
stratified rock
numerical simulation
deformation and displacement characteristics
failure mechanism
