坚硬顶板近距离煤层覆岩运移与应力演化特征
Characteristics of Strata Movement and Stress Evolution of Close Distance Coal Seams Mining with Hard Roof
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摘要: 基于坚硬顶板和近距离煤层群耦合开采条件作业空间安全隐患较大的问题，采用离散元软件对该条件下采动覆岩运移规律及顶板应力演化特征进行了研究。结果表明：老顶及上下层位坚硬顶板的垮落形态分别呈“W”型、“V”型和“U”型；开采初期，上下层位坚硬顶板协同弯曲运动，工作面回采70 m后，二者间出现离层并随工作面推进（90 m和110 m）出现2次突然垮落；顶板岩块水平应力与垂直应力的变化决定其运动状态。Abstract: Based on great potential safety hazard of work space with the mining condition of close distance coal seams and hard roof, the discrete element calculation software is adopted to research laws of strata movement and characteristics of roof stress evolution. The results shows that the rock falling formations of clastic rock, upper and lower siltstone are respectively "W" type, "V" type and "U" type, and that is associated with potential energy; the upper and lower hard roof moves cooperatively during early mining and a abscission layer between them will appear at 70 m, in addition, two sudden breaking-off occurs at 90 m and 110 m; the change of horizontal stress and vertical stress between roof rocks affects rocks' fracture, bending and rotation movement.
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Keywords:
- close distance coal seams /
- hard roof /
- strata movement /
- stress evolution /
- 3DEC
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