岩土力学2017，Vol.38Issue(10)：2923-2930,8.DOI:10.16285/j.rsm.2017.10.020
石膏矿矿柱-护顶层支撑体系的流变力学模型分析
Rheological mechanical model of pillar-protective roof supporting system in gypsum mines
摘要
Abstract
In this study,a rheological mechanical model was developed for the pillar-protective roof system in gypsum mines.The gypsum pillar was considered as a visco-elastoplastic body in the rheological model satisfying the Nishihara model,and the pre-setting protective roof on the top of the goaf was simplified as an elastic rectangular sheet.On the basis of the established model,a deflection differential equation was derived for the stabilization time of protective roof under the support of the pillar,Besides,a solution of Galerkin method was applied to the equation in accordance with the boundary conditions of the protective roof at three stages.When the stress σ on the pillar is greater than the limit friction resistance σs,the plastic rheological deformation of the pillar gradually increases with time,which eventually results in the failure of the pillar-protective roof system.Based on a case study,the proposed mechanical model can forecast the stable time of the roof rock in the pillar-protective roof system of mined-out area by considering the rheological behaviour of pillars.关键词
采矿工程/石膏矿/矿柱/护顶层/稳定时间Key words
mining engineering/gypsum mine/pillar/protective roof/stable time分类
数理科学引用本文复制引用
夏开宗,陈从新,刘秀敏,宋许根,蒋玄苇,周意超..石膏矿矿柱-护顶层支撑体系的流变力学模型分析[J].岩土力学,2017,38(10):2923-2930,8.基金项目
国家自然科学基金面上项目(No.51274188).This work was supported by the General Program of National Natural Science Foundation of China (51274188). （No.51274188）
