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。

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).

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。

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。

The geological conditions of coal seam are evaluated quantitatively by using fuzzy method and from pointview of coal mining. According to the evaluation results, decision-making on mining techniques, mining programming and design, production management can be carried out effectively. The latest developments in China are introduced. The evaluation contents, the structure and index system of evaluation factors, the membership functions and weights of evaluation factor, evaluation model and reliability are stated in detail. The effective application of fuzzy evaluation in the prediction of coal face output is introduced emphatically. Fuzzy evaluation on geological conditions of coal seam is the basic work that ensures a mine run efficiently, safely and steadily.