基于刚架结构模型法的采空区群失稳分析  

Goaf group instability analysis based on rigid frame structure model method

作　　者：姜立春[1,2] 肖康[2] 吴爱祥[3] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]华南理工大学安全科学与工程研究所,广东广州510640 [3]北京科技大学土木与环境工程学院,北京100083

出　　处：《岩石力学与工程学报》2016年第A02期4204-4210,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家"十二五"科技支撑计划基金资助项目(2012BAB08B02);国家自然科学基金资助项目(51174093;51574013)~~

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。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.

关 键 词：采矿工程 采空区群 刚架结构 失稳判据 

分 类 号：TD323[矿业工程—矿井建设]