摘要:
断层区开采扰动下煤岩体破损演化复杂,基于清水营煤矿地质特征构建物理相似实验模型;集成声发射、覆岩变形监测、热红外成像等实验手段,研究了断层区域煤岩体结构在开采扰动下断层上下盘运移、破坏特征及应力应变空间演化规律。研究表明:受剪切滑移诱发断层活化的距离为20 m;过断层期间,受采动影响断层区覆岩结构呈“弧形拱”破坏,垮落高度在12~18 m(平均高度15 m)、断裂带高度约75 m;断层内外声发射特征差异性显著,断层下盘覆岩受开采扰动,向采空区滑动,顶板来压剧烈,呈高应力集中载荷,声发射AE信号活跃,能率和事件数分别达到704 977.96和25 370。
关键词:
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断层区
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相似模型
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弧形拱
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差异性
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应力演化
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能量场
Abstract:
Under the disturbance of mining in the fault area, the rock mass damage evolution is complicated. Based on the geological characteristics of Qingshuiying Coal Mine, we build a physical similar experimental model which integrates acoustic emission, overlying strata deformation monitoring, thermal infrared imaging and other experimental methods. The coal and rock mass structures in the fault area under the disturbance of mining have been studied on the movement and failure characteristics of the upper and lower plates and the evolvement laws of stress, strain and strain. The study shows that the longth of fault activated by shear slip is about 20 m. During the period of passing through fault, the overburden rock structure is damaged by “arc arch” in the fault zone affected by mining. The height of collapse is 12 m to 18 m (average height is 15 m) and the height of fracture zone is about 75 m. There are great differences in the acoustic emission characteristics between the inside and outside the fault. The overlying fault in the footwall of the fault is disturbed by mining, and it slides to the goaf, and the roof pressure is intense and the load is high; AE signal is active, the energy rate is 704 977.96 and the number of events is 25 370 respectively.
百度学术
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