期刊论文

Investigation on the fracture mechanism of the immediate roof in shallow buried gypsum mine and its application

He, Guicheng(hegc9210@163.com)

中文

采矿与安全工程学报

1673-3363

2018

35

4

773-779

10.13545/j.cnki.jmse.2018.04.015

51374129:国家自然科学基金 51774187:国家自然科学基金 2017JJ4009:湖南省自然科学基金 2017CT5006:湖南省科技厅中央引导地方科技发展专项资金项目 2017SK2280:湖南省科技厅重点项目 17A184:湖南省教育厅重点科研项目

本校为第一且通讯机构

采用弹性力学理论,将石膏矿采空区直接顶视为四边固支的弹性薄板,建立了直接顶破断的力学模型,分析其在法向和切向荷载作用下的临界荷载及影响因素,确定其破断判据及破断特征,并应用于衡山某石膏矿试验采场,分析其稳定性,得到了该矿最合适的采场结构参数。研究结果表明:直接顶承受的最大拉应力随采场埋深及矿房长度与矿房跨度比值的增加而增大,随直接顶厚度的增加而减少;当矿房长度和矿房跨度接近时,直接顶承受的最大拉应力较小;当直接顶承受的最大拉应力大于其抗拉强度时,直接顶下表面中部岩体开始产生裂隙,裂隙沿四周向直接顶边界发展;随后直接顶上表面中部靠近工作面处的岩体产生裂隙,裂隙沿...

The immediate roof of gypsum mine is regarded as an elastic thin plate with four sides fixed based on elastic mechanics theory. Therefore, mechanics model of the immediate roof is established. Critical load of the immediate roof and that influence factors are analyzed under normal loads and tangential loads. Fracture criterion and fracture character are determined. These theoretical analysis results are applied to the test stope of Hengshan gypsum mine for evaluating stability and optimizing structure parameters. The research results show that ...