江淮地区弱膨胀土力学性能及边坡失稳特征分析OA

With the deepening implementation of the integrated development strategy of the Yangtze River Delta,the scale of engineering construction in the Jianghuai region has been continuously expanding.However,due to the special engineering properties of expansive soils,conventional slope stabilization techniques are often insufficient to ensure long-term stability.Slopes are prone to landslide and instability during the operational stage after undergoing multiple rainfall-evaporation cycles.The results revealed the evolution mechanism of slope failures in expansive soil slopes.Rainfall duration plays a controlling role in slope deformation,while rainfall pattern had a dominant influence on the location of the potential sliding surface.When the number of rainfall cycles exceeded 12,the risk of slope instability increased significantly.Therefore,slope protection engineering in expansive soil areas of the Jianghuai region should strengthen monitoring and inspection during long-term operation and maintenance to effectively reduce the risk of landslide hazards.Based on the characteristics of expansive soils in the Jianghuai region and the background of expressway construction projects,this paper adopted a combination of field investigations and laboratory tests to investigate the engineering physical and mechanical properties and microstructural characteristics of expansive soils under long-term rainfall-drying cycles.Furthermore,a slope stability analysis of expansive soil slopes under rainfall conditions was conducted.