反程序开采底板岩层破裂区分布的探测研究

Study on Fractured Zone Distribution of the Floor Strata under Abnormal Procedures of Mining

采用瑞利波探测技术、现场实测、数值模拟等手段,对木城涧煤矿+450 m水平近距离反程序开采三槽煤层的底板裂隙发育情况进行探测分析,得出受二槽煤开采引起的三槽煤底板的破坏程度的分区及其空间展布。研究结果表明:三槽底板处于二槽开采引起的裂隙带范围内;在距离三槽底板19～7.8 m处的岩体受二槽煤开采影响引起的裂隙尤为发育;三槽底板的中砂岩段岩层基本保持完整状态,该段为三槽底板稳定的关键层位。现场钻探试验与探测结果基本吻合,反映出了瑞利波探测技术探测反程序开采底板岩层裂隙发育情况的可信度,并通过数值模拟对反程序开采的卸压效果、卸压区域进行了分析。

With application of Rayleigh wave detection technology,field measurement and numerical simulation,the fissure developmental condition of floor strata for seam No.3 with short distance abnormal procedure mining for ＋450 m in Muchengjian mine is detected,obtaining the partition of damage degree of seam No.3 floor and its space distribution caused by the seam No.2 mining.The research results indicate that the seam No.3 floor ranges in the fractured zone caused by mining of the seam No.2;the cracks of rock caused by the seam No.2 mining is developed well especially between the position 19 m and 7.8 m of the seam No.3 floor;The medium sandstone stratum of the seam No.3 floor is in basic complete state,and this section is the key horizon of stability for the No.3 seam.The basic drilling test coincides with the results of Rayleigh wave detection,reflecting the credibility of Rayleigh wave detection with abnormal procedures to detect the fracture of floor strata.Then the numerical simulation is used to analyze the pressure released effect and regions with abnormal procedure of mining.