双煤系煤层群开采覆岩动态形变及矿压显现规律研究

发布时间：2018-05-16 18:34

本文选题：煤层群 + 垮落步距　；参考：《煤炭科学技术》2017年09期

【摘要】：针对大同矿区双煤系纵深大区域煤层群开采条件,对大区域顶板岩层动态垮落形变与矿压显现特征规律进行了研究。以同忻煤矿8105工作面为工程实例,在提出了上部煤层未开采区域、遗留煤柱区域、开采垮落区域向下传递动态载荷的计算方法基础上,对动态载荷作用下岩层的垮落步距修正计算进行了研究。研究结果表明:同忻煤矿8105工作面受上部侏罗系14号煤层开采影响,主关键层垮落步距为38.23~62.32 m,8105工作面开采波及的顶板范围较广,各关键层发生同步失稳是导致强矿压显现的诱因;而主关键层垮落步距的动态变化,增加了其发生同步失稳的概率,是导致工作面频繁强矿压显现的原因。同时发现,纵深大区域煤层群开采条件下,上部煤柱对工作面强矿压显现的影响具有滞后性。
[Abstract]:In view of the mining conditions of coal seam group in the deep and large area of double coal series in Datong mining area, the characteristics of dynamic collapse deformation and rock pressure behavior of roof strata in large area are studied. Taking 8105 face of Tongxin Coal Mine as an engineering example, this paper puts forward the calculation method of dynamic load transfer down from the unmined area of upper coal seam, the area left over by coal pillar and the area of mining collapse. In this paper, the calculation of caving step distance under dynamic load is studied. The results show that the 8105 face of Tongxin Coal Mine is affected by the mining of the upper Jurassic No. 14 coal seam, and the caving distance of the main key stratum is 38.23 ~ 62.32 mc8105 face. The synchronous instability of each key layer is the inducement of the strong rock pressure, and the dynamic change of the falling step distance of the main key layer increases the probability of synchronous instability, which is the reason of the frequent occurrence of strong rock pressure in the face. At the same time, it is found that under the condition of coal seam group mining in deep and large area, the influence of upper coal pillar on the appearance of strong mine pressure in working face has hysteresis.
【作者单位】：辽宁工程技术大学矿业学院;辽宁工程技术大学安全工程技术研究院;辽宁工程技术大学安全科学与工程学院;
【基金】：国家自然科学基金资助项目(51604144)
【分类号】：TD325

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