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为了得出司马煤矿薄基岩区导水裂隙带的发育规律,首先对薄基岩分布特征及岩层力学特性进行了分析,进而利用经验公式计算出了导水裂隙带发育高度,同时运用数值计算软件RFPA2D对煤层开采进行了模拟。结果表明:司马煤矿3#煤层薄基岩总体趋势为一向斜,局部有小的隆起和凹陷,薄基岩厚度变化范围在30~80 m;3#煤层上覆的整个基岩柱的强度大于40 MPa,属于坚硬型;经验公式计算得到司马矿3#煤层薄基岩导水裂隙带发育高度在47.3~83.5 m之间,与数值模拟得到的最大发育高度85 m基本相符。
In order to get the law of the development of water-conducting fractured zone in thin bedrock area of Sima Coal Mine, the distribution characteristics of thin bedrock and mechanical properties of rock strata are analyzed firstly, and then the development height of hydraulic fractured zone is calculated by empirical formula. Software RFPA2D simulates coal mining. The results show that the trend of thin bedrock of coal seam # 3 in Sima Coal Mine is generally oblique, with small uplift and depression in local, thickness range of thin bedrock varies from 30 to 80 m. The strength of the whole bedrock overlying 3 # 40 MPa, which belongs to the hard type. The empirical formula shows that the development height of the water-bearing fractured zone of the thin bedrock of Sima Coal Mine No. 3 is between 47.3 and 83.5 m, which is basically consistent with the maximum developed height of 85 m obtained from the numerical simulation.