Research on slope stability of open-pit mining during freezing period under hydrothermal coupling
GU Haoyuan
HAN Liu
ZHANG Jian
LIU Shibao
GAO Zhiqiang
WU Fengfeng
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.
Keywords：freezing periodsoil strengthslope stabilityslope mininginner dump and slope compacted
Publication Date：2023-12-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 159-166 )