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为了确定莒山矿井长壁工作面开切眼过程中的端头效应,利用数值仿真技术,建立长壁工作面开切眼的大型三维数值计算模型,分析在不同掘进步距和不同掘进长度下开切眼围岩的应力特征和位移特征,并据此确定端头效应的影响范围。研究结果表明:巷道断面掘进过程中存在着端头效应,在该矿工程条件下端头效应的影响区域大约在距掘进头后10 m范围内,强烈影响区域约在距掘进头后8 m范围内;开挖完成后,开切眼巷道帮部的铅垂应力分布规律为从巷道表面向围岩深部由小到大,再由大到小过渡到原岩应力状态。
In order to determine the end effect of the longwall face during the cutting process of the longwall face, a large three-dimensional numerical model for the opening of the longwall face was established by using the numerical simulation technology. Open cut the surrounding rock stress characteristics and displacement characteristics, and to determine the impact of end-effect range. The results show that there is a head-end effect in the roadway tunneling process. The influence area of the head-end effect in the tunnel project is about 10 m behind the heading head and the strong influence zone is about 8 m behind the heading head After the excavation is completed, the law of vertical stress distribution in the open cut roadway gang department is from small to large in the depth of the surrounding rock and then to the original rock stress state from large to small.