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为研究“三硬”煤层开采覆岩活动规律及采动支撑压力变化,以忻州窑矿8935工作面为研究对象,通过开展相似材料模拟试验,分析“三硬”煤层开采覆岩破坏特征及应力变化规律,得出上覆岩层损伤演化规律。结果表明:顶板垮落规律明显,初次垮落具有突发性,无明显征兆,且初次垮落步距较长,周期来压规律明显;开采过程中顶板、底板、煤层支撑压力动态变化,且应力集中系数最大值出现在煤层中,极易出现煤层突出。根据顶、底板应力变化规律划分支撑压力影响区域。
In order to study the rule of overlying strata movement and the change of mining supporting pressure in the “three hard” coal seam mining, the 8935 working face of Xinzhouyao mine was taken as the research object. By simulating the similar material, the “three hard” Vandalism and stress variation rules of the overburden strata. The results show that the law of roof caving is obvious, the caving of first caving is sudden and there is no obvious sign, and the length of the first caving is longer and the law of periodic pressure is obvious. The supporting pressure of roof, floor and coal seam changes dynamically during mining The maximum stress concentration factor appears in the coal seam, which is prone to be prominent in the coal seam. According to the top and bottom of the stress changes in the law of support pressure area.