摘要
以逢春煤矿急倾斜薄煤层俯伪斜综合机械化开采为工程背景,采用3DEC离散元数值模拟方法,对不同煤层厚度、煤层倾角、顶板岩性条件下的覆岩垮落和支架受力变形规律进行模拟研究。数值分析结果表明,当煤层厚度较小、顶板较破碎或倾角较小时,采场顶板沿工作面倾斜方向的垂直应力、垂直位移和卸压拱高度较大,反之较小;支架工作阻力是工作面中部最大,上部次之,下部最小。根据数值模拟结果,研制出相应的液压支架并进行了工程应用,测试结果表明,支架工作阻力数值模拟结果与实测结果的误差在5.0%以内,该液压支架对急倾斜薄煤层俯伪斜工作面的适应性较好。
Abstract： In this paper, simulation study was carried out on the law of the overburden strata caving and the support deformation under the conditions of different thickness and pitch of the coal seams and lithologieal characters of the roof rock by taking the pitching oblique fully-mechanized mining of the steep thin seam in Fengchun Mine as the engineering background and using 3DEC discrete element numerical simulation method. The numerical analysis results showed that when the coal seam thickness was smaller, the roof was more broken or the seam pitch was smaller, the vertical stress, the vertical displacement and the unloading arch height of the stope roof along dip direction of the coal face were all larger, on the contrary, they were smaller; the yield load of the powered support was the largest in the middle part of the working face, the second in the upper part and the smallest in the lower part. Based on the numerical simulation results, corresponding powered support was developed and then applied in the engineering, the test results showed that the error between the numerical simulation results and the measured results of the support yield load was within 5.0%, indicating that the powered support had better adaptability in the pitching oblique coal face of the steep thin seam.
出处
《矿业安全与环保》
北大核心
2017年第3期1-5,9,共6页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(51474039
U1361205)
关键词
急倾斜薄煤层
俯伪斜
综采工作面
3DEC离散元
数值模拟
液压支架
工作阻力
steep thin seam
pitching oblique
fully mechanized working face
3DEC discrete element
numerical simulation
hydraulic support
yield load
