摘要
区段煤柱合理宽度直接影响动压回采巷道围岩控制效果。本文针对崔家寨矿5~#煤层E12505工作面地质条件,提出采用锚梁网索联合支护技术控制围岩变形,并对支护参数进行系统优化。继而根据三维应力状态下煤岩体的极限平衡理论,推导出合理煤柱宽度理论值,同时采用FLAC^(30)模拟软件分析不同宽度煤柱受力状况。理论计算与数值模拟结果综合对比,确定了崔家寨矿5~#煤层回采巷道合理支护参数及煤柱尺寸(6~7m)。研究成果为复杂应力条件下巷道围岩稳定性控制、煤柱宽度的合理留设提供了理论依据。
The surrounding rock controlling effects of roadway are directly affected by the rational width of coalpillar. According to the geological and mining technical conditions of the E12505 working face in CuijiazhaiCoal Mine, the bolt - mesh - anchor support parameters are optimized and the design scheme of combined sup-porting technique is put forward. In addition, this paper deduced the calculation formulas of the limit equilib-rium zone width based on the limit equilibrium theory in the three dimensional stress states. The theoreticalvalues of coal pillars＇ width were obtained. Based on the FLAC3D numerical simulation software, coal pillars＇stress field characteristics were investigated at different coal pillar widths. In comparison with the results oftheoretical calculation and numerical simulation, the rational width of the sectional coal pillar was set as 67m. In addition, this paper provides the theory basis for retaining reasonable sectional coal pillars and control-ling stability of surrounding rock.
出处
《华北科技学院学报》
2014年第9期16-20,26,共6页
Journal of North China Institute of Science and Technology
基金
中央高校基本科研业务费资助(3142013035)
河北省矿井灾害防治重点实验室资助(KJZH2013S03)
关键词
围岩控制
煤柱合理宽度
采动应力
极限平衡区
数值模拟
surrounding rock control
the rational width of the coal pillars
the mining stress
the limit equi-librium width
numerical simulation
