如何合理地评价硬石膏采房群或采空区的稳定性对保证安全生产、处治现有采空区具有重大的意义。选取山东肥城某石膏矿为工程实例,通过室内试验获取硬石膏岩石的物理力学参数;结合现场调查和室内试验结果,采用广义Hoek-Brown强度准则和地质强度指标估算了硬石膏岩体强度;运用FLAC3D5.0建立数值仿真模型,评价了硬石膏采房群的整体稳定性。基于广义Hoek-Brown强度准则的单元安全系数法(ESFM),定量分析了硬石膏采房群的局部稳定性。结果表明:该硬石膏开采完形成的采房群围岩体塑性区大量贯通,房柱基本破坏;房柱围岩单元的单元安全系数介于0.9~1.1之间,处于欠稳定状态甚至不稳定状态;该硬石膏采房群整体稳定性和局部稳定性差。因此,应优化硬石膏的采矿方法或采取必要的支护以保证安全生产。研究结果为采房群稳定性分析提供了参考。
Abstract
Estimating the stability of anhydrite cavern group or goaf areas exactly is of great significance for guaranteeing the production safety of anhydrite mine and the treatment of goaf area. With an anhydrite mine located in Feicheng, Shandong Province as an engineering example, the stability of anhydrite rock was estimated based on generalized Hoek-Brown criterion. First of all, the physical and mechanical parameters of anhydrite was obtained through laboratory test. In association with field investigation and lab tests, the strength of anhydrite rock mass was calculated based on the generalized Hoek-Brown failure criterion and geological strength index (GSI). Subsequently, the global stability of anhydrite cavern group was assessed by the numerical model built in FLAC3D5.0, while the local stability of anhydrite cavern group was estimated as well using element safety factor method (ESFM). Results indicated that the plastic zone of rock mass connected largely, and the pillars between caverns mainly broke. The element safety factor of pillars was between 0.9 and 1.1, implying poor stability status or even instability status. The global and local stability of the studied anhydrite cavern group were extremely inferior. Hence, the mining method should be optimized,or necessary supporting measures should be adopted to guarantee the production safety.
关键词
硬石膏岩体 /
采房群 /
Hoek-Brown强度准则 /
围岩稳定性 /
单元安全系数法(ESFM)
Key words
anhydrite rock mass /
mining group /
Hoek-Brown failure criterion /
surrounding rock stability /
element safety factor method (ESFM)
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基金
国家自然科学基金项目 (41572301, 61427802, 41972300) ; 中央高校基本科研业务经费项目(2-9-2015-071)
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