综放工作面区段煤柱合理宽度优化研究

Study on Optimization of Rational Width for Sectional Coal Pillar in Fully Mechanized Top Coal Caving Mining Face

为了合理确定兑镇煤矿工作面区段间的煤柱宽度,在保证巷道支护稳定前提条件下,减小煤柱宽度,提高煤炭采出率,通过对现场采集的煤层及顶底板煤岩样进行了煤岩体的物理力学参数测试,采用FLAC3D数值分析软件,建立了工作面回采过程中不同宽度区段煤柱的力学模型,对比分析了3种不同煤柱宽度时围岩应力、变形及塑性区分布规律的差异。结果表明:16 m宽的煤柱可以较好地减小工作面推进过程中煤体的应力集中程度、塑性区范围及侧向位移,减少煤柱宽度,最终确定了区段煤柱合理的宽度为16 m,工作面实现安全回采。

In order to rationally set up the width of the sectional coal pillars in the coal mining face of Duizhen Mine, on the premise to ensure the support stability of the gateway, the width of the coal pillar left should be reduced and the coal mining rate should be increased. With the measurement and test on the physical mechanics parameters of the coal and rock mass with the coal and rock samples collected from the seam as well as the roof and floor, the FLAC3D numerical analysis software was applied to establish the mechanics model of the different width sectional coal pillars in the mining process. The comparison and analysis was conducted on the differences of the surround- ing rock stress, deformation and plastic zone distribution law when three different widths of the coal pillars applied. The results showed that the coal pillar with a width of 16 m could be well to reduce the stress concentration degree of the coal mass during the advancing process of the coal mining face, the plastic zone scope and the lateral deformation value and could reduce the coal pillar width. Finally the rational section coal pillar width was determined as 16 m and the coal mining face could realize the safety mining.