论文部分内容阅读
煤层在开采过程中,经常会受到水害的影响。由于水对煤体的物理化学作用,导致煤体弱化,从而影响到采场围岩应力的分布异于未受地下水威胁的采场。为了研究不同含水率对采场稳定性的影响,首先测定了煤体在不同含水率下(3%、6%、9%)的相关物理力学参数,然后通过理论分析和数值模拟软件分别对不同含水率下煤层沿走向推进一定距离后,煤层围岩体的稳定性进行分析研究。研究结果表明:在工作面推进了同样的距离后,随着煤层含水率的升高,煤柱应力集中系数减小,峰值应力向远离煤壁方向转移,采空区顶板破坏区域变大。同时,含水率的增加,对底板变形的影响不大。
In the mining process, coal seams are often affected by water damage. Due to the physical and chemical effects of water on the coal, the coal is weakened, which affects the stress distribution of the surrounding rock in the stope to be different from the stope that is not threatened by groundwater. In order to study the influence of different moisture content on the stability of stope, the relevant physical and mechanical parameters of coal under different moisture contents (3%, 6%, 9%) were measured first, and then analyzed by theoretical analysis and numerical simulation software respectively. Under the condition of water content, the coal seam advances a certain distance along the strike, and the stability of surrounding rock mass in coal seam is analyzed and studied. The results show that with the increase of water cut in the coal seam, the stress concentration factor of coal pillar decreases and the peak stress shifts away from the coal wall, and the damage area of roof in the goaf becomes larger. At the same time, the increase of moisture content has little effect on the deformation of the floor.