煤矿安全2023，Vol.54Issue(12)：159-166,8.DOI:10.13347/j.cnki.mkaq.2023.12.019
水-热耦合下露天矿冻结期靠帮开采边坡稳定性研究
Research on slope stability of open-pit mining during freezing period under hydrothermal coupling
摘要
Abstract
The geological model of slope was established by taking the northern end of Baorixile Open-pit Mine as the research ob-ject.Based on the hydrothermal coupling theory,the thickness changes of frozen layer under different temperatures were analyzed by COMSOL finite element analysis software.GEO-slope software is used to analyze the slope stability under different thicknesses,re-vealing the influence law of slope angle change on slope stability,and determining the reasonable slope angle of slope mining in freezing period.The results show that the optimum mining period is from mid-February to mid-March,when the maximum frozen layer thickness is about 3.4 m.Under the action of 3.4 m frozen layer,the stability coefficient of slope in frozen period increases by 7.3%compared with that in non-frozen period.During the freezing period,the reasonable slope angle is 29°,and more than 84,000 t coal can be recovered.A transitional measure of increasing the width of the inner row step to 40 m is proposed to ensure the safety of the transition from freezing period to thawing period.关键词
冻结期/土层强度/边坡稳定性/靠帮开采/内排压帮Key words
freezing period/soil strength/slope stability/slope mining/inner dump and slope compacted分类
矿业与冶金引用本文复制引用
谷浩源,韩流,张健,刘世宝,高志强,吴锋锋..水-热耦合下露天矿冻结期靠帮开采边坡稳定性研究[J].煤矿安全,2023,54(12):159-166,8.基金项目
国家自然科学基金青年科学基金资助项目(51804298) （51804298）
国家自然科学基金面上资助项目(51674245) （51674245）
