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中文摘要：
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18．01m，然后通过现场使用地质雷达探测，得到影响深度为22m，最后通过FLAC3D数值模拟分析得出2—2中煤层推进80m的底板最大塑性区为20m，理论计算、数值模拟和地质雷达测试结果基本一致。
英文摘要：
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.
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