石膏矿矿柱-护顶层支撑体系的流变力学模型分析
发布时间：2018-08-01 14:36
【摘要】：采用房柱法开采石膏矿体,将石膏矿柱简化为满足西原模型的黏弹塑性体流变模型,采空区上部留设的护顶层简化为弹性矩形薄板,建立了石膏矿矿柱-护顶层支撑体系的流变力学体模型。在此模型的基础上推导了矿柱支撑下采空区护顶层受流变作用的挠度微分方程,并根据其在不同阶段的边界条件采用伽辽金方法对该微分方程进行了求解。研究结果表明:当作用在矿柱上的应力σ大于极限摩阻力σ_s时,石膏矿柱的塑性流变大变形将随时间逐渐增大,极易导致石膏矿柱-护顶层支撑体系破裂直至坍塌;所建立的考虑矿柱流变特性的石膏矿采空区矿柱-护顶层支撑体系力学模型,可以对支撑体系的稳定时间进行预测。
[Abstract]:The gypsum ore body is mined by the room column method, and the gypsum pillar is simplified as the viscoelastic plastic rheological model satisfying the West original model. The retaining wall at the upper part of the goaf is simplified as the elastic rectangular thin plate, and the rheological mechanics body model of the plaster mine pillar support system is established. The differential equation of the top layer is subjected to rheological action, and the differential equation is solved by Galerkin method based on the boundary conditions at different stages. The results show that when the stress on the pillar is greater than the limit friction resistance Sigma _s, the plastic rheological deformation of the plaster pillar will gradually increase with time, and it will easily lead to gypsum. The pillar support roof support system breaks down and collapses, and the mechanical model of the gypsum mine goaf pillar support system, which takes into account the rheological characteristics of the pillar, can predict the stability time of the supporting system.
【作者单位】： 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金面上项目(No.51274188)~~
【分类号】：O37
，
本文编号：2157896
[Abstract]:The gypsum ore body is mined by the room column method, and the gypsum pillar is simplified as the viscoelastic plastic rheological model satisfying the West original model. The retaining wall at the upper part of the goaf is simplified as the elastic rectangular thin plate, and the rheological mechanics body model of the plaster mine pillar support system is established. The differential equation of the top layer is subjected to rheological action, and the differential equation is solved by Galerkin method based on the boundary conditions at different stages. The results show that when the stress on the pillar is greater than the limit friction resistance Sigma _s, the plastic rheological deformation of the plaster pillar will gradually increase with time, and it will easily lead to gypsum. The pillar support roof support system breaks down and collapses, and the mechanical model of the gypsum mine goaf pillar support system, which takes into account the rheological characteristics of the pillar, can predict the stability time of the supporting system.
【作者单位】： 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金面上项目(No.51274188)~~
【分类号】：O37
，
本文编号：2157896
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