中文摘要：

以某矿综放工作面的开采实际为背景，采用现场应变测试和数值模拟相互验证的方法，对采动条件下厚煤层底板破坏深度进行综合对比研究。现场实测表明，某矿综放工作面煤层底板岩体破坏深度介于13～16m之间，采动矿压对底板的影响具有较远距离的“超前”显现和“滞后”延续的特点，（超前、滞后距）表现有由浅及深相应减小的总体特征；数值模拟研究表明，工作面底板下0～16m为底板破坏影响带，即底板最大破坏深度为16m，16～36m岩层受煤层开采影响较小，再往下有接近原岩应力的趋势；综合分析得出该面采动底板变形破坏深度为16m，研究结果为我国类似条件下煤炭资源安全开采及矿井水害防治提供参考依据。

英文摘要：

Based on the condition of fully-mechanized working face in one mine, by using the field strain measurement and numerical simulation as a mutual authentication method, a comprehelasive comparative study of the thick seam floor＇s failure depth under the mining was carried out in this paper. Field measurement studies show that the failure depth of the coal seam floor is about 13-16m. The in- fluence of the mining pressure on the floor presents the feature of＂advance＂appearance and ＂lag＂ con- tinuity, while the advance and lag distances are manifested as the feature of decreaing gradually from shallow to deep. The numerical simulations indicate that floor failure zone affected by mining is be- tween 0-16 m under the coal seam, which means the greatest failure depth of floor is 16 m, the zone of 16-36 m under the coal seam is slightly affected by coal mining, and the mining pressure tends to in situ pressure along with the increase of depth. By the comprehensive analysis, the failure depth of coal seam floor is 16 m, and the research results can make reference for safety mining of coal resources and mine water disaster control under the similar conditions.