采动过程中下被保护层煤体变形渗流规律研究

发布时间：2018-05-23 13:44

本文选题：上保护层开采 + 加卸载路径　；参考：《防灾减灾工程学报》2017年05期

【摘要】：为得到采动过程中被保护层煤体的变形、渗流规律,进行了煤样在加卸载应力作用下的变形与渗流实验研究。以红阳三矿上保护层开采为工程背景,采用数值模拟得到保护层采动过程中下被保护层煤体的加卸载路径,依据该加卸载路径对被保护层煤体试样进行加卸载,得到应力—应变及应力—渗透率关系曲线。研究结果表明:加卸载过程中,轴向应变随加卸载表现为线性向非线性转变,且卸载过程中轴向应变未能恢复至初始值;环向应变随加卸载表现为非线性变化。相同应力值对应的加卸载渗透性变化规律为:一次卸载阶段渗透率小于一次加载阶段渗透率小于二次加载阶段渗透率。
[Abstract]:In order to obtain the deformation and percolation law of protected coal during mining, the experimental study on deformation and seepage of coal samples under loading and unloading stress was carried out. Taking the mining of the upper protective layer in Hongyang No. 3 Mine as the engineering background, the loading and unloading path of the coal body under the protective layer during the mining process of the protective layer is obtained by numerical simulation, and according to the loading and unloading path, the sample of the coal body of the protected layer is loaded and unloaded. The stress-strain and stress-permeability curves are obtained. The results show that the axial strain changes linearly to nonlinear during loading and unloading, and the axial strain fails to recover to the initial value during loading and unloading, and the circumferential strain shows nonlinear variation with loading and unloading. The change rule of loading and unloading permeability corresponding to the same stress value is that the permeability in the first unloading stage is less than that in the first loading stage and the permeability in the second loading stage is less than that in the second loading stage.
【作者单位】：辽宁工程技术大学力学与工程学院;辽宁工程技术大学矿业学院;
【基金】：国家重点研发项目(2016YFC0600704)资助
【分类号】：TD311;TD712

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