弹性基础边界基本顶板结构周期破断与全区域反弹时空关系

doi:10.13722/j.cnki.jrme.2018.0923

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摘要为了提出预警基本顶大面积周期来压灾害的方法，采用理论计算、相似模拟与工程实践相结合的方法研究基本顶板结构周期破断与全区域反弹压缩场的时空关系并得到如下结论：(1) 基本顶板结构深入煤体周期破断时，断裂线外围依次产生“I级半椭圆反弹区”→“C形压缩区”→“II级C形反弹区”→“C形压缩区”。(2) 断裂线前侧的I级反弹区中部反弹量最大，断裂线端部为压缩区；II级反弹区内外边界线的间距基本相等，且反弹量先增大后减小。(3) 一次破断形成的反弹压缩区形态与分次破断形成的不同。(4) 基本顶的破断程度越大反弹量越大，但基本不改变反弹压缩区的分布形态。II级反弹区“包围”整个“悬顶区”，所以在邻侧巷道及两巷区可监测基本顶深入煤体周期断裂产生的反弹压缩信息。采用特制高精度位移传感器相似模拟试验和工程实践验证了结论的正确性。形成了预警基本顶大面积周期来压灾害的“1同时、2滞后、2区域、2指标及2控制”的方法体系。

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	陈冬冬
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	曾俊超

关键词 ：采矿工程, 基本顶, 弹性基础, 反弹压缩, 周期破断, 弹性薄板

Abstract：In order to put forward an early warning method of roof cutting disasters with a large area caused by periodic fracturing of the main roof，the time-space relationship between periodic fracture of the plate structure of the main roof and rebound compression field formed by periodic fracturing in whole roof area was studied based on theoretical calculation，similarity simulation and engineering practice. The results show that，when the periodic fracture of the plate structure of the main roof with elastic foundation boundary occurs ahead of the coal wall，four zones including semi-ellipse rebound zone (I)，C-type compression zone，C-type rebound zone (II) and C-type compression zone will be generated in turn on the periphery of the fracture line. The rebound amount in the central region of rebound zone (I) in front of the fracture line is the largest，and the compression zone is located at the end region of the fracture line. The distance between the inner and outer boundary lines of the rebound zone (II) almost keeps constant，and the rebound amount in rebound zone (II) increases firstly and then decreases. The morphology of the rebound compression zone generated by the graded fracturing is obviously different from that generated by the one-off fracturing. The greater the fracture degree of main roof strata is，the larger the rebound amount of the plate structure of the main roof will be. However，the fracture degree of main roof strata has no obvious influence on the distribution form of the rebound compression zone. Due to that the rebound zone (II) encircles the entire “hanging roof area”，the rebound compression information generated by periodic fracturing of the main roof ahead of the coal wall can be detected in the two roadway regions and adjacent roadway regions. Furthermore，the correctness of the conclusions has been verified by similarity simulation experiment using the special high-precision displacement sensor and engineering practice. An early warning system of roof cutting disasters with a large area caused by periodic fracturing of the main roof，including one synchronization，two delays，two zones，two indexes and two controls，is formed.

Key words： mining engineering main roof elastic foundation rebound compression periodic fracture elastic thin plate

引用本文:

陈冬冬，何富连，谢生荣，曾俊超. 弹性基础边界基本顶板结构周期破断与全区域反弹时空关系[J]. 岩石力学与工程学报, 2019, 38(6): 1172-1187.
CHEN Dongdong，HE Fulian，XIE Shengrong，ZENG Junchao. Time-space relationship between periodic fracture of plate structure of main roof and rebound in whole region with elastic foundation boundary. , 2019, 38(6): 1172-1187.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0923 或 http://www.rockmech.org/CN/Y2019/V38/I6/1172

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