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为了研究近水平厚煤层采动影响下支承压力分布与裂隙场演化的关系,采用相似模拟实验对五阳煤矿工作面回采过程中煤岩体内支承压力变化及覆岩裂隙演化进行了模拟。研究结果表明,工作面回采后,上覆煤岩体内产生冒落带、裂隙带和弯曲下沉带,冒落带高度22 m,裂隙带高度46 m;工作面回采过程中,支承压力呈动态变化,工作面前方支承压力可分为原岩应力区、应力降低区、应力波动区、应力集中区和应力升高区。采空区支承压力变化受关键层影响,关键层破断之前裂隙较为发育,采空区中部在关键层破断后被压实,裂隙密度减小,但切眼和工作面附近裂隙密度依然很大。
In order to study the relationship between bearing pressure distribution and the evolution of fractured field under the mining condition of near horizontal thick coal seam, similar simulation experiments were used to simulate the variation of bearing pressure in coal and rock and the evolution of overlying strata fissures in the mining process of Wuyang coal mining face. The results show that caving zone, fissure zone and curved sink zone are produced in overlying coal and rock body after mining face, the height of caving zone is 22 m and the height of fissure zone is 46 m. During the process of working face mining, the supporting pressure is Dynamic changes in front of face support pressure can be divided into the original rock stress zone, stress reduction zone, stress wave zone, stress concentration zone and stress zone. The change of bearing pressure in the goaf is affected by the key layer. The fractures are more developed before the key layer is broken. The middle part of the goaf is compacted after the key layer is broken, and the crack density is reduced. However, the crack density near the cut hole and the working face is still large.