基于刚架结构模型法的采空区群失稳分析

doi:10.13722/j.cnki.jrme.2015.1356

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摘要为研究纵向采空区群在外部荷载作用下的整体稳定性，将其转化为平面刚架体系，构建纵向采空区群刚架结构的失稳模型，提出基于刚架结构模型法的采空区群失稳判据及分析方法。通过分析多层纵向单元空区构成的采空区群在顶层间柱回采后的整体稳定性，利用数值模拟和现场工程验证该方法分析结果的可靠性。结果表明，间柱回采完成后，顶板围岩的最大拉应力值、最大竖向变形量均超过允许的阀值，采空区群处于严重失稳状态；数值模拟对比分析表明，空区群内部质点的最大拉应力、压应力值与前者基本吻合，变化趋势相似，拟合度高；现场工程揭示，采空区群上部中段顶板出现垮塌，覆岩坍塌，采空区与地表贯通，验证了该方法分析结果的可靠性。

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	姜立春1
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	肖康2
	吴爱祥3

关键词 ：采矿工程, 采空区群, 刚架结构, 失稳判据

Abstract：In order to study the overall stability of vertical goaf group under external load，a rigid frame structure model was developed by converting vertical goaf group into plane frame system. Based on the model，a goaf group instability judgment criteria and analysis method was presented. The method，together with numerical simulation method，was used respectively to analyze the overall stability of a vertical goaf group after completely mining the pillar of the uppermost level. The result shows that，after mining the pillar，the maximum tensile stress and vertical deformation of the uppermost roof surrounding rock mass both exceed the permitted threshold，which has led severe instability to the goaf group. Comparing with numerical simulation method，the conclusion of two methods has close values of internal rock mass both on maximum tensile stress and compressive stress，which shows similar variation trend. The field engineering proves that the gob roof rock mass of the uppermost level has been collapsed and the gob has extended to surface，which has verified the rigid frame structure model method in large part.

基金资助:mining engineering；goaf group；rigid frame structure；instability judgment criteria

引用本文:

姜立春1，2，肖康2，吴爱祥3. 基于刚架结构模型法的采空区群失稳分析[J]. 岩石力学与工程学报, 2016, 35(S2): 4204-4210.
JIANG Lichun1，2，XIAO Kang2，WU Aixiang3. Goaf group instability analysis based on rigid frame structure model method. , 2016, 35(S2): 4204-4210.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1356 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/4204

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