大佛寺煤矿4号煤层平均厚度14.8m，上覆岩层宜君、洛河砂岩组为区域砂砾岩含水层，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，甚至波及含水砂岩层危及工作面安全生产。在既定地质条件下研究富水覆岩综放开采透水机理及控制技术具有重要的工程意义和实用价值。 从综放工作面覆岩特征，顶板含水层数目位置、厚度以及含水特征等基本的工程地质条件入手，判定覆岩层关键层、隔水层位置及岩层渗透特性，研究导水裂隙带发育规律及其影响因素，为进一步研究综放开采工作面顶板透水提供基础和条件； 以西安科技大学岩层控制重点实验室为依托，针对彬长矿区大佛寺煤矿工程地质条件，利用物理相似模拟和“固-液”耦合相似模拟实验方法对综放开采过程进行了模拟研究，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，为揭示顶板透水机理提供基础依据。 采用有限单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，分析了采动过程中覆岩变形破坏和移动特征，对工作面可能产生的透水区域和透水量做了预计；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，经工作面实际透水量现场观测得出技术措施得当，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. Roof water inrush is a complicated process of geology and mechanics, it concerned with the style, character and conservation of water bodies, and with hydrogeologics, stratum structure and geological mining conditions of roof water resisting layer. Research start from the overlaying strata and regional aquifer characters such as number and positions and so on, the key stratum and roof water resisting layer positions and seepage property of different rock strata are determinanted and the developing rule of water flowing fractured zone in mining and influencing factors are got, the results offers the foundation and contidion for learning water incrush. 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 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.