残采间柱条件下空区群顶板失稳的QR法分析  被引量:1

Analysis on the Roof Instability of Goaf Group Under Residually Mining Spacer Pillars by QR Method

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作  者:姜立春[1,2] 李令鑫 

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

出  处:《矿业研究与开发》2017年第8期9-14,共6页Mining Research and Development

基  金:国家重点研发计划项目(2016YFC0600802);国家自然科学基金资助项目(51174093;51574013;51374035)

摘  要:提出基于类框架结构模型QR法的残采间柱条件下空区群顶板失稳分析方法,通过构建采空区群类框架结构受力分析模型,建立采空区群内节点位移函数表达式,采用改进后的QR法计算单元空区关键部位的应力和位移幅值,结合应力和位移失稳判据,研究残采间柱条件下采空区群顶板的稳定性。某金矿1570m中段间柱采动前后采空区群顶板对比计算表明,间柱回采前,各顶板均处于稳定状态;间柱回采后,仅回采中段顶板最大竖向位移与最大拉应力均大于允许阀值,该顶板处于不稳定状态,有失稳风险。现场回采工程结束后,1570 m中段顶板严重失稳,上部覆岩汇入,空区与地表贯通,验证了该方法的可靠性。A method was proposed based on the QR method of frame-like structure model - the analysis method of roof instabili- ty of goaf group under residually mining spacer pillars. By constructing the mechanical analysis model of the frame-like struc- ture, the displacement function expression of the node in the goaf group was established. The improved QR method was used to calculate the displacement and stress amplitude of the key points in the unit goaf. Then, combined the instability criterion of dis- placement and stress, the roof stability of goaf group was studied under residually mining spacer pillars. The comparative calcu- lation of the roof before and after mining pillars at the 1570 m midpiece in a gold mine showed that, all roofs were in a state of stability, before pillar mining; the maximum tensile stress and vertical displacement of the roof only at the mining midpiece were both exceeded the allowable threshold, after pillar mining, so the roof was instability with failure risk. After completing the field work, the roof at the 1570 m midpiece was in a severe instability state. With importing upper overlying strata, as well as penetrating the goaf and the sueface, the reliability of this method was verified.

关 键 词:采空区群 顶板稳定性 类框架结构模型 QR法 

分 类 号:TD853.391[矿业工程—金属矿开采]

 

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