对十二矿影响煤与瓦斯突出的井田地质构造、煤体结构、煤厚及其变化、煤层围岩等地质因素进行了分析。
The geologic factors which have effected on the well geologic structure, coal structure, coal thickness and its changes, coal seam surrounding rock and some other factors have been analysed.
运用相似材料模拟和数值计算的方法，对水平分段和倾斜分层放顶煤开采引起的围岩移动特征进行了比较。
The rock movement between the horizontal section of the top coal caving and inclined slicing of the top coal caving was analyzed.
南屯煤矿深部松软煤层巷道，在掘进过程中顶板破碎，伴有大量顶煤冒落且围岩破坏严重。
During the initial excavation, the tender coal seam workings in deep seam in Nantun Colliery takes on slocking of roof, with breaking-out in bulk coal and surrounding rock failure.
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