Analysis of Deformation mechanism and stability of Yanggaoshan landslide under action of continuous rainfall
In order to explore the influence factors of rainfall on the deformation and failure mechanism and stability of small and medium-sized soil landslides,Yanggaoshan landslide in Yushan County was selected as the research object.Through the correlation analysis of the monitoring data of surface displacement,soil pressure and soil moisture content during the key pe-riod from 2022 to 2023,the response relationship between it and rainfall was determined.The deformation trend in different rainfall periods is analyzed,and the deformation mechanism of Yanggaoshan landslide is discussed.The relationship between rainfall intensity and safety factor is explored by using GeoStudio two-dimensional numerical software.The results show that:the unique geological structure and artificial cut slope provide potential conditions for the development of landslides,and rainfall is the main inducement of Yanggaoshan landslide;When rainfall intensity is 10mm/d,long-term rainfall has little effect on landslide stability;When the rainfall intensity is 20mm/d,the landslide safety factor decreases by 3%under the action of long-term rainfall,and the landslide is still stable.When the rainfall intensity is 30mm/d,the landslide safety factor decreases by 12%under the action of long-term rainfall,and the landslide is in an understable state.When the rainfall in-tensity is 40mm/d,the landslide safety factor decreases by 30%under the action of long-term rainfall,and the landslide is in an unstable state.