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红会四矿地质条件复杂,综放工作面仰采坡度大,造成煤壁片帮和端面冒顶非常严重,是制约工作面安全高效生产的主要因素之一。采用FLAC3D计算分析了6种不同仰采坡度下工作面围岩应力的分布特征。结果表明,当仰采坡度超过20°时,工作面前方支承压力峰值点加速向煤壁移近,当仰采坡度35°时,支承压力峰值点距煤壁仅1.7 m;煤壁内拉应力区也迅速扩大,2.5 m高处煤壁内拉应力区深度已经达到4.4 m。
Due to the complex geological conditions of the Red Mine, the slope of fully mechanized sub-level caving face has a large slope, which causes the coal wall and gangue roof to fall very seriously, which is one of the main factors restricting the safe and efficient production of working face. The FLAC3D calculation was used to analyze the stress distribution characteristics of the surrounding rock in the working face under six different slopes. The results show that when the slope elevation is more than 20 °, the peak pressure of supporting pressure in front of the working face accelerates to the coal wall. When the slope of heading is 35 °, the peak value of bearing pressure is only 1.7 m away from the coal wall; The area also rapidly expanded. The depth of the tensile stress zone in coal wall at 2.5 m height has reached 4.4 m.