孤岛综放工作面沿空掘巷围岩变形因素研究

基于孤岛工作面地质条件、开采工艺及原始矿压显现规律,运用关键层理论研究两侧极不充分采动条件下基本顶关键层效应对巷道围岩稳定性的影响,并通过数值模拟软件UDEC,详细分析了煤层硬度、基本顶断裂位置、护巷煤柱尺寸及孤岛工作面开采等因素对综放沿空掘巷顶板垂直应力分布和围岩变形特征的影响,并指出沿空掘巷支护重点。

Research on surrounding rock deformation factors in gob-side entry driving of fully mechanized longwall top coal caving mining face in island seam

Base on the geological conditions,mining technology and initial strata pressure behave of the coal mining face,the paper with the key stratum theory studied the key stratum of the key roof influenced to the surrounding rock stability of the mining gateway under the non mining active condition at the two sides of the mining face.With the numerical simulation software UDEC,the paper in detail analyzed the seam hardness,breaking location of the basic roof,coal pillar size and island face mining influenced to the vertical stress distribution in the roof of the gob-side entry driving for the coal mining face and to the surrounding rock deformation features.The paper pointed out the key support points of the gob-side entry driving.