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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。
In order to study the overall stability of longitudinal gob group under the action of external load, it is transformed into a planar rigid frame system, and the instability model of the rigid frame structure of longitudinal gob-area is established. Based on the frame structure model, Dispersion Criteria and Analysis Methods of Group. By analyzing the overall stability of gob-gondolume group consisting of multiple vertical cells, the reliability of the method is verified by numerical simulation and field engineering. The results show that the maximum tensile stress and the maximum vertical deformation of roof rock exceed the allowable threshold after the completion of the mound mining, and the goaf area is in a serious unstable state. Comparing the numerical simulation results, The maximum tensile stress and compressive stress of the particle are basically in agreement with the former, with similar changing trend and high fitting degree. The field project reveals that the roof of the upper middle section of the goaf collapse, the overburden rock collapses and the gob area intersects with the surface, verifying The method analyzes the reliability of the results.