地质雷达探测底板破坏深度的数值模拟研究

摘要

针对李家壕煤矿近距离煤层群同采工程背景,为了探究上位2-2中煤层开采对下位3-1＃煤层顶板的影响深度,首先采用理论公式计算出影响深度为18·01 m,然后通过现场使用地质雷达探测,得到影响深度为22 m,最后通过 FLAC3D数值模拟分析得出2-2中煤层推进80 m的底板最大塑性区为20 m,理论计算、数值模拟和地质雷达测试结果基本一致。%Aiming at the situation of simultaneous mining in close-distance seam group in Li-jiahao Mine,in order to explore the influence depth of upper 2-2 seam mining to the lower 3-1 coal seam,the paper,firstly,calculates the influence depth is 18.01m by the theoretical formula, and then gets the damage depth is 22m through on-site GPR detection,and finally,with the FLAC3D numerical simulation analysis it works out that the maximum floor plastic zone is 20m when 2-2 middle seam moving ahead 80m.The results of theoretical calculation and numerical simulation are basically consistent with that of GPR detection.