采场瓦斯涌出量随着顶板运动而产生周期性起伏变化，顶板运动对煤层瓦斯涌出的影响是通过改变煤层的瓦斯压力、瓦斯存在形态及煤层孔隙特征而实现的。在分析煤层瓦斯存在形态和涌出规律的基础上，定性分析了矿压显现对煤层瓦斯存在形态及采空区瓦斯分布的影响规律，解释了顶板运动改变工作面风流中瓦斯浓度的原因。为监测预报工作面瓦斯和顶板来压提供了科学理论依据和方法。

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。

Aimed at the technical difficulties of gob-side entry retaining in fully-mechanized coalface with top-coal caving (GERFCTC), a new technique of entry-in packing is put forward. In this technique, there are three key aspects: (1) to set up the reasonable mechanic model of surrounding-rock structure; (2) to maintain the integrity of the top coal for the entry with large-section in the coal seam; (3) to control the stability of the packing body with large bulk and long distance. In order to use the new technique in the entry, which has been excavated with normal section for several years, supported by ladder-shaped steel rigid support, actual steps are put forward. The results of industrial test and field measurement show that the technique is used successfully. It can be applied in similar conditions of fully-mechanized coalface with top-coal caving (FCTC).

According to the technical requirements of gob-side entry retaining in fully mechanized coalface with top-coal caving, the bolt and cable, instead of the original I-steel trapezium-shaped support, are used to reinforce the belt entry, which is excavated in thick coal seam. The reinforcing scheme and parameter of bolting with wire mesh and cable are introduced emphatically. The technique has been used in Chanchun Coal Mine of Luan Coal Group, and the good reinforced effects are also shown by the field measurement results. The reinforcing technique lays a good foundation for the successful test of gob-side entry retaining in fully mechanized coalface with top-coal caving.

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.