The creep deformation pattern of the top loess cover layer on a slope of an open-pit mine in Longnan,Gansu
Longnan,Gansu,located in the Qinba mountainous area and adjacent to the Loess Plateau of Gansu,some of the geological conditions of the open-pit mines are upper loess and lower bedrock.Due to the differ-ent deformation characteristics of loess and bedrock,it has led to unique deformation of the slopes of the open-pit mines in Gansu,posing challenges to slope management and safety production,especially the serious creep deformation of the loess cover layer affecting slope safety.This paper comprehensively monitored the slopes through methods such as slope radar monitoring,unmanned aerial surveying,monitoring videos,and on-site inspections.The monitoring results showed that the creep of the loess cover layer at the top of the southern slope of the M Gully mining area is greatly affected by seasonal changes:in spring,the creep gradually accelerates under the influence of rainfall;in summer,rainfall and rock weakening intensify the creep,which easily leads to instabil-ity and damage;in autumn,rainfall decreases,and the creep gradually weakens;in winter,the creep is intensi-fied again due to the indirect influence of rock freezing and thawing.The research findings reveal the creep law of the loess cover layer in the M Gully mining area,providing core ideas for monitoring and governance schemes of the loess cover layer for the mine,and have certain reference significance for the safety production of other slopes of this type.
open-pit slopeloesscreepslope radarmonitoring and management
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NSTL
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