为从根本上研究煤层开采过工程中因顶板冒落、放顶垮落造成的顶板突水通道的变化规律。首次运用FLAC3D数值软件的应力—渗流耦合系统，结合工程实践，系统分析了采动岩体的渗流矢量、渗流速度、孔隙压力及导水边界线的动态发展规律和分布特征，进行了顶板突水危险区域的识别，得出了一些对防治采场顶板突水有益的结论，可为煤矿顶板突水事故防治提供理论依据。数值模拟结果表明采动岩体的突水通道的发展明显受煤层开采的影响，且当主关键层破断时，采场最易发生顶板突水事故。在此基础上，将采场的渗流动态变化特征与采动岩体的破断、运动规律结合分析，给出了采场顶板破断及破断岩块再组合压实过程中渗流裂隙的扩展、闭合演化过程。如果水源有限且现有设备能及时排除水患，当煤层采完后，采动岩体能重新压实闭合失去导水性能，地下水位能逐步恢复，可以实现保护第四系及地表水的采煤技术。同时证明FLAC3D的应力—渗流耦合系统能预测并预算采动岩体裂隙产生、发展、闭合及相关危害性的可靠的数值定量分析软件，可作为一个新方法在顶板突水防治和保水采煤技术中应用。

Stope water inrush is an accident which can cause great casualty. To study the transformation regularities of water inrush channel in the cover strata induced by the roof breakage and the roof caving, the FLUID-MECHANICAL function of the Universal Distinct Element Code (UDEC) is designed to calculate the cranny expanding and close phases during the roof breakage and recombination. Combined with the practical engineering, the features of dynamic development and dis tribution of the seepage vector, seepage velocity and its boundary are systematically analyzed. Some reasonable achievements can be applied in the prevention and cure of water inrush, which proves that the UDEC is one of the credible numerical qualitative analysis methods to forecast the cranny's initiation, propagation, close and other hazards (such as the water inrush and the groundwater runoff). The result of merical simulation shows that the water inrush channel is influenced obviously by the coal mining. The risk of water inrush is highest when the main key strata breaks, therefore this phenomenon should be paid more attention to.

The high-water solidifying material is a kind of special concrete. Its main properties are introduced such as strong water-solidifying capability, fine pumpability and pumpable for a long time, quick setting and with early-developed strength, high residual strength after being cracked, etc. This material has been used with satisfactory results in entry-side packing to maintain an entry along the gob edge. The deformation mechanism and relevant parameters of the entry-side packing body are analyzed. A technique of "three-dimension reinforcing net with bolt for entry-side packing" is emphatically introduced to control the stability of the packing body, and the good reinforcing effects of the packing body are also shown by the field measurement results. The high-water material and the reinforcing technique lay a good foundation for the successful test of gob-side entry retaining in fully-mechanized coalface with top-coal caving.

为从根本上研究煤层开采过工程中因顶板冒落、放顶垮落造成的顶板突水通道的变化规律。运用UDEC数值软件的应力—渗流耦合系统，计算了采场顶板破断及破断岩块再组合压实过程中突水通道的扩展、闭合演化过程。结合工程实践，系统分析了采动覆岩导水裂隙渗流矢量、渗流速度、孔隙压力及覆岩导水边界线的动态发展规律和分布特征，得出了一些防治采场顶板突水的有益结论，可为类似条件下煤矿顶板突水事故防治提供理论依据。并采用FLAC3D的应力—渗流耦合系统对所得结论进行了验证，证明该UDEC和FLAC3D的应力—渗流耦合系统都能预测并预算采动覆岩裂隙产生、发展、闭合及相关危害性的可靠的数值定量分析软件。数值模拟结果表明采场覆岩的突水通道的发展明显受煤层开采的影响，且当主关键层破断时，采场最易发生顶板突水事故。

顶煤的运移与垮落，尤其是内部微观裂隙的扩展，与其直接顶和老顶岩层的活动规律密切相关。针对某一厚硬岩层既是上层煤的底板，又直接是下层煤顶板的实际情况，采用数值计算与物理模拟相结合的研究方法，分析清楚了厚硬岩层的破断特征。在此基础上，提出了9种上层煤与下层煤不同开采方案，系统分析了下层煤顶煤压缩量的变化，并确定出上层煤与下层煤工作面交错的合理布置方式，为下层煤推广综放开采工艺提供了设计指导。