大佛寺煤矿4号煤层平均厚度14.8m，上覆岩层宜君、洛河砂岩组为区域含水层，厚度大，富水性好，渗透性强。当采用综采放顶煤采煤法开采时，导水裂隙带高度加大，顶板透水是危及其首采工作面安全生产的一大隐患。研究含水层下综放开采覆岩破坏规律和透水机理具有重要的实际意义和一定的理论价值。 本文引用尖点突变理论分析顶板透水现象，定性解释了顶板透水机理，定量得到了顶板透水控制因素的极值条件。以西安科技大学岩层控制重点实验室为依托，得到了满足“固-液”耦合相似模拟试验要求的材料及配比，并获得其物理力学参数。利用固体相似模拟和“固-液”耦合相似模拟实验针对大佛寺矿区地质条件进行了研究，互补两种研究手段的利弊，分析了上覆岩层采动过程中岩体运移规律、裂隙扩展规律和水介质运移规律。采用通用离散元数值模拟方法对含水层下综放开采覆岩破坏规律进行了模拟研究，分析了覆岩采动过程中的变形破坏和移动特征，并与物理模拟结果进行了比较。在对透水灾变机理综合研究的基础上，提出了顶板透水的控制技术措施，对现场工程实践具有一定的参考价值。

The No.4 coal seam average thickness of Dafosi coal mine is 14.8m, the overlying rock stratum Yi-jun and Luo-he sandstone group are regional aquifer, the thickness is larger, the water-abundance is better and the permeability is stronger. When the fully-mechanized caving mining technology is used, the height of water flowing fractured zone is also increased, the roof water-inrush become endangering production safety to the first-mining face. Thus the study on the rule of overlying strata failure and water-inrush mechanism has a great practical significance and certain theoretical value. Cusp catastrophe theory is sited to analyze the phenomenon of the roof water inrush in the paper, qualitative interpreted the mechanism, fix quantify extreme condition of the roof water-inrush control factor is got. Rely on the provincial key lab of ground controlling of Xi'an University of Science and Technology, the material and the mixture of material which can meet liquid-solid coupling experiment is got, and the sample’s physical and mechanical parameters is analyzed. Combined solid similar simulation with liquid-solid coupling experiment, studied Dafosi coal mining geology condition and complemented the different research means, the overlying strata during mining rock mass migration principle, crack extension principle and water migration principle are analyzed. By using Universal Distinct Element Code method, the rule of overlying strata failure beneath aquifer is studied, the deformation and failure and movement characteristic of overlying strata during mining is analyzed, and the result of numerical simulation is compared with physical simulation. Based on the integrated research to water-inrush catastrophe mechanism, the control measure of roof water-inrush is proposed, there is certain reference value to the project practice in its result.