不同侧压系数下巷道围岩变形破坏特征研究  

Study on deformation and failure characteristics of surrounding rock in roadway with different lateral pressure coefficients

作　　者：谭涛 许梦国[1,2] 王平[1,2] 曾文旭 李丹峰 杨洋 TAN Tao;XU Mengguo;WANG Ping;ZENG Wenxu;LI Danfeng;YANG Yang(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan Hubei 430081,China;Key Laboratory of Hubei Province for High-Efficient Use of Metallurgical Mineral Resources and Agglomeration,Wuhan Hubei 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081

出　　处：《化工矿物与加工》2020年第8期21-25,共5页Industrial Minerals & Processing

基　　金：国家自然科学基金资助项目(51604195)。

摘　　要：随着地下开采向深部延伸,开采活动所面临的地应力环境愈发复杂;侧压系数是反映地应力特征的重要参数,不同侧压系数下巷道围岩变形破坏特征各异。基于FLAC3D数值模拟软件建立巷道三维模型,探究不同侧压系数下巷道开挖后围岩的应力分布、变形以及塑性区分布等规律,结果表明:当侧压系数为1.0时,巷道综合稳定性最高;在侧压系数小于1.0时,表现为顶底板变形量大,两帮受压且变形量较小;侧压系数大于1.0并逐渐增大时,顶底板围岩塑性区不断扩展,底板拉应力集中程度逐渐明显,两帮收敛程度逐渐加大。将研究成果应用于程潮铁矿-410 m水平5号矿体的采场巷道支护设计,实践表明支护方案效果良好。With the extension of underground mining to the deep, the in-situ stress conditions for mining operation becomes more and more complex,the lateral pressure coefficient is an important factor to reflect the characteristics of in-situ stress,and the deformation and failure characteristics of surrounding rock in roadway varies with lateral pressure coefficients. Based on the FLAC3 D numerical simulation software, the three-dimensional model of roadway was established to explore the stress distribution, deformation and plastic zone distribution of surrounding rock after excavation with different lateral pressure coefficients.The results show that when the lateral pressure coefficient was 1.0, the comprehensive stability of roadway reached the maximum.When the lateral pressure coefficient was less 1.0, both the roof and floor would deform greatly. Both sides were pressed and deformed a little. When the lateral pressure coefficient was more than 1.0 and increased gradually, the plastic zone would expand around the surrounding rock of roof and floor,the concentration degree of tension stress on floor was gradually obvious and the convergence degree of two sides increased gradually. The results from research have been applied in the design of roadway support for ore body No.5 at level-410 m in stope of Chengchao Iron Mine. The practice shows that the design of roadway support is effective.

关 键 词：侧压系数 围岩变形 数值模拟 稳定性 应力集中 巷道支护 FLAC3D 

分 类 号：TD325[矿业工程—矿井建设]