持续降雨下阳高山滑坡变形机理与稳定性分析

Analysis of Deformation mechanism and stability of Yanggaoshan landslide under action of continuous rainfall

为了探究雨量对中小型土质滑坡变形破坏机理及稳定性影响,选取玉山县阳高山滑坡为研究对象。通过对其2022—2023年期间重点时间段的地表位移、土压力、土壤含水率监测数据进行关联分析,确定其与降雨量之间的响应关系,分析其在不同降雨时期的变形趋势,探讨了阳高山滑坡的变形机理,并运用GeoStudio二维数值软件探究降雨强度与安全系数之间的关系。研究表明,独特的地质结构与人工切坡为滑坡的发育提供潜在条件,而降雨是阳高山滑坡产生的主要诱因;当降雨强度为10 mm/d,长时间降雨对滑坡稳定性影响不大;当降雨强度为20 mm/d时,在长时间降雨作用下,滑坡安全系数下降3%,滑坡仍处于稳定状态;当降雨强度为30 mm/d时,在长时间降雨作用下,滑坡安全系数下降12%,滑坡处于欠稳定状态;当降雨强度为40 mm/d时,在长时间降雨作用下,滑坡安全系数下降30%,滑坡处于失稳状态。

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 period 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 intensity 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.