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中文摘要：
为了确定断层附近防隔水煤（岩）柱的合理宽度，解决煤炭安全生产问题，以山西省某矿下保护层开采为工程研究对象，用FLAC如数值模拟软件进行了数值仿真计算，充分考虑了断层的产状和落差，再现了回采工作面在推进过程中的顶底板采动裂隙的发展情况，并结合经验公式法确定了隔水煤（岩）柱的合理宽度。同时还利用数值计算结果，对该矿六采区下保护层开采作了突水危险性评价。研究结果表明：断层不但是影响保护层开采底板扰动破坏程度的重要因素，也是确定防隔水煤（岩）柱宽度的关键所在。在对矿井突水危险性评价中，应该考虑采动对底板扰动破坏的影响。
英文摘要：
In order to determine the safe width of fault waterproof coal （rock） pillar and solve the safety mining problem, the lower protective seam mining of a coal mine in Shanxi Province is taken as an engineering research object. Taking faults＇ occurrence and throw into account, numerical tests with FLACaD numerical simulation software are conducted to investigate the development of mining-induced fractures in coal seam roof and floor, and the reasonable width of waterproof coal （rock） pillar is determinated through combining numerical simulation with empirical formula method. In addition, the risk evaluation of coal seam floor water inrush of No. 6 mining area in this coal mine is finished using the result of numerical simulation. It is shown that fault is not only an important factor affecting the disturbance failure extent of coal seam floor in protective seam mining, but a key factor determining the safe width of waterproof coal （rock） pillar. In the risk evaluation of coal mine water inrush, the effect from mininginduced disturbance failure of coal seam floor should be considered.
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