斜沟矿切顶卸压沿空成巷无煤柱开采技术研究
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摘要
针对深部巷道围岩应力环境的复杂特性,巷道围岩常出现大变形难控制现象,以斜沟矿23111综采工作面为研究背景,通过分析沿空留巷围岩赋存特征及活动规律,揭示了巷道围岩应力分布及破坏特征。在此基础上,提出了切顶卸压无煤柱开采原理及核心技术,并运用FLAC3D数值模拟软件,对不同切顶高度下围岩垂直应力分布特征进行研究。依据上述研究成果结合现场工况进行试验,试验结果显示:切顶高度7 m时,巷道围岩垂直应力集中程度较低,且易于施工,切顶卸压沿空成巷效果明显。
In view of the complex characteristics of the surroundin g rock stress environment of deep roadway, the surrounding rock of roadway often appears large deformation and it is difficult to control. Based on the research background of 23111 fully mechanized mining face in Xiegou mine, the stress distribution and failure characteristics of the surrounding rock of roadway retained along goaf are revealed by analyzing the occurrence characteristics and activity rules of the surrounding rock of roadway retained along goaf. On this basis, the principle and core technology of roof-cutting and pressure-relief coal pillar-free mining are put forward, and the vertical stress distribution characteristics of surrounding rock under different roof-cutting heights are studied by using FLAC3 D numerical simulation software. According to the above research results and field work conditions, the test results show that when the cutting height is 7 m, the vertical stress concentration of surrounding rock is low, which makes it easy to construct.And the effect of roof cutting pressure relief along goaf is obvious.
In view of the complex characteristics of the surroundin g rock stress environment of deep roadway, the surrounding rock of roadway often appears large deformation and it is difficult to control. Based on the research background of 23111 fully mechanized mining face in Xiegou mine, the stress distribution and failure characteristics of the surrounding rock of roadway retained along goaf are revealed by analyzing the occurrence characteristics and activity rules of the surrounding rock of roadway retained along goaf. On this basis, the principle and core technology of roof-cutting and pressure-relief coal pillar-free mining are put forward, and the vertical stress distribution characteristics of surrounding rock under different roof-cutting heights are studied by using FLAC3 D numerical simulation software. According to the above research results and field work conditions, the test results show that when the cutting height is 7 m, the vertical stress concentration of surrounding rock is low, which makes it easy to construct.And the effect of roof cutting pressure relief along goaf is obvious.
引文
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[4]王炯,朱道勇,宫伟力,等.切顶卸压自动成巷岩层运动规律物理模拟实验[J].岩石力学与工程学报,2018,37(11):2 536-2 547.
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