近距离煤层群重复采动下端面稳定性分析
Stability Analysis of End Face in Close Coal Seam Group Under Repeated Mining
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摘要: 端面顶板稳定性差一直是制约大采高工作面安全、高效开采的一大难题,这一问题在近距离煤层群开采中更加突出。针对近距离煤层群重复采动下端面冒顶这一难题,采用室内试验、理论分析、数值模拟等手段研究了重复采动下端面顶板稳定性。研究得到:受重复开采扰动的影响,下位顶板裂隙比较发育,顶板岩体强度变得更低,在相同顶板压力作用下端面顶板更容易失稳;17#煤层开采时,采场上方不同层位顶板将形成2种“拱式”结构和1种“砌体梁”结构,并会出现3种不同程度的顶板来压现象,频繁来压容易造成端面冒顶;近距离煤层群重复采动下,作用在端面顶板的压力并不大,端面失稳的主控影响因素是端面顶板岩体强度,该条件下煤壁片帮与端面冒顶的防控措施是对煤壁与端面顶板进行超前加固。Abstract: The poor stability of the end face roof has been a major problem restricting the safe and efficient mining of large mining height working face, which is more prominent in the mining of the close coal seams. In view of the problem of roof caving of end face under repeated mining in close coal seam group, the stability of end face under repeated mining was studied by means of indoor test and theoretical analysis and numerical simulation. The research results showed that due to the influence of repeated mining, rock body fissures of end face are more developed, the rock body strength becomes lower as well, and the roof of end face is more prone to instability at the same roof pressure; during the mining of 17# coal seam, two kinds of “arch” structure and one kind of “masonry beam” structure will be formed at the top of different layers above the stope, and there will be three different degrees of roof pressure phenomenon; under the repeated mining of the coal seam group, the roof pressure is not large, thus, the main controlling factor of roof instability of end face is the rock body strength. Under this condition, the prevention and controlling measures of the coal face spalling and end face roof caving are advanced reinforcement for the coal face and the end face roof.
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