为了研究土层隔水层在采动及渗流作用下的破坏规律，采用了固-液耦合相似材料模拟试验研究和土层破坏理论分析。试验表明，在采用的长壁间隔式开采中，浅埋煤层中的组合关键层破断后进入裂隙带，隔水土层协调运动进入弯曲下沉带。该开采方法改变了岩层的运动破坏规律，抑制了采动裂隙在隔水土层中的发展，避免了导水裂隙与含水层贯通，达到了保护土层的采动隔水性目的。土层变形、破坏理论分析表明，组合关键层的破断距亦即对应土层的跨距，在弯曲下沉过程中没达到变形破坏极限跨距，不会产生导水裂隙，满足保持隔水性能的判据。现场开采实践证明，试验工作面开采后未出现潜水渗漏。该方法并已成功实现多个工作面的保水开采。

In order to study destruction law of aquiclude under the action of mining and seepage, this paper carries out the experiments of solid-liquid coupling similar simulation and the theoretical analysis of soil damage. The experimental results show that, in use of method of long wall mining in the interval mining, the combinatorial key stratum in shallow coal seam breaks into the fracture zone, and aquiclude breaks into the bending subsidence zone. The mining method can change the stratum moving destruction law and restrain the development of caving fissure into aquiclude, and avoid the connect with the bending subsidence zone. The method can achieve the purpose of protecting water-isolating capacity. Theoretical analysis of soil deformation and failure reveals that span of soil layer is span of the combinatorial key stratum breaking. The fractured water-conducting zone cannot be produced when the span doesn’t reach the limit deformation span in bending and sinking failure process. The mining practice has proved that water leakage doesn’t appear in the mining site after mining. The method is successfully used in a number of mining face exploitation to achieve water protection mining.