Analysis of the influence of freeze-thaw action on the stability of open-pit mine slopes
In order to study the influence of freezing and thawing on the stability of layered rock slopes with dif-ferent dip angles,an open-pit mine in the alpine region of Mozhugongka County,Xizang was taken as the research object,and the stability safety factor of the slope was calculated by using the limit equilibrium method and the geotechnical engineering simulation software GEO-Studio.The safety factors of layered rock slopes with different dip angles before and after freezing and thawing were compared and analyzed,and the influence of freezing,thaw-ing and dip angles on the stability of layered rock slopes was studied.The results show that:(1)as the design slope angle gradually increases,the safety factor of the slope before and after freeze-thaw gradually decreases.The decrease before freeze-thaw is 16.2%-32.6%,and the decrease after freeze-thaw is 15.2%-28.2%;(2)After freeze-thaw action,the cohesive force and internal friction angle of the slope rock mass decrease.The overall safety factor of the slope after freeze-thaw is 0.86%-3.32%lower than before,and freeze-thaw has a certain impact on the overall stability of the slope.The results of this study have certain guidance and reference value for the damage and prevention of slopes in permafrost areas.
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