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基于内蒙古布尔台矿已有的工程地质资料,采用数值模拟软件RFPA~(2D),建立了双煤层重复采动的数值模型,模拟研究了覆岩破断、裂隙发育和再发育规律,分析了上覆岩层在采动前后垂直应力的变化情况.结果表明:重复采动可引起原有煤层覆岩裂隙的再发育,使得顶板裂隙波及的含水层范围扩大,从而增大采空区的涌水量,甚至会引发突水;采动使得覆岩的垂直应力减小,而重复采动更加剧了这一趋势,这是覆岩裂隙继续发育的重要因素.
Based on the existing engineering geological data of the Bo Er Tai mine in Inner Mongolia, the numerical simulation software RFPA ~ (2D) was used to establish the numerical model of double mining for double coal seam. The law of overburden fracture, fracture development and re-development was simulated. The results show that the repeated mining can cause the re-development of the overburden strata in the original coal seam, enlarge the aquifer area affected by the roof fissure, and increase the water influx in the goaf, And even cause water inrush. The mining mining makes the vertical stress of overlying strata decrease, and the repeated mining aggravates this trend, which is an important factor for the further development of overburden rock fracture.