Stability Analysis Of Secondary Slope Of Spoil Under Continuous Rainfall Condition

In recent years,the stability of high soil slopes has always been a concern of engineering geology in the geotechnical field at home and abroad.Especially since the 21 st century,China's economy has been booming,resources and energy development are gaining momentum,the scale of construction projects is expanding,urbanization is accelerating,and infrastructure construction projects have been unprecedentedly developed.The consequent problems of the stability of high soil slopes have also It is increasing sharply.Its stability directly affects the safety of the project and the safety of people's lives and property.Among the many adverse factors that affect the stability of high soil slopes,continuous rainfall conditions are an important factor that causes slope instability.Therefore,the research on the stability of high soil slopes under rainfall conditions and the analysis of the use of slope protection and reinforcement measures in this paper have very important practical significance for preventing geological disasters,protecting engineering safety,and protecting people's lives and property.Based on the saturated-unsaturated seepage theory and Mohr's Coulomb yield criterion,this paper analyzes the effects of different rainfall durations on the stability of high soil slopes based on different rainfall intensities,and finally proposes preliminary management measures for the slopes based on the research results.The main research conclusions are as follows:(1)Based on the field geological surveying,drilling data and test results,the quantitative and qualitative research methods are used to introduce the regional geological background of the project,the rock and soil characteristics of the slope,and the geological structure of the slope.The mechanical and physical characteristics of the various geotechnical materials of the slope and relevant evaluations were carried out to determine the possible failure locations of the selected slope to establish an effective slope geomechanical model.(2)Under the same rainfall intensity,the pore water pressure,saturation,slope displacement,and plastic area of the slope soil have a positive correlation with the rainfall duration,and the matrix suction has a negative correlation with the rainfall time.Under the conditions of the same rainfall duration,the pore water pressure,saturation,slope displacement and plastic area of the slope soil have a positive correlation with rainfall intensity,and the matrix suction has a negative correlation with rainfall intensity.Large rainfall intensity is not conducive to slope stability.(3)From the cloud diagram of the simulation results,it can be seen that the maximum slope displacement occurs on the secondary slope,and the displacement vector diagram shows that the secondary slope has a tendency to slide to the left,and the plastic area is mostly concentrated on the slope of the secondary slope Therefore,it can be judged that the foot of the secondary slope is relatively easy to landslide.For the study area,the secondary slope needs to be protected and reinforced.(4)According to the calculation results of slope stability analysis,the slope at the first-level platform of the downstream slope of the abandoned slag body can be protected by the methods of clear slope cutting and concrete frame beam protection;The slope is protected by anchor bolts to enhance the anti-sliding ability of the slope.Water interception and drainage projects are set up to reduce rainwater infiltration and prevent erosion of the slope surface.At the same time,the slope can be planted with a developed root system,strong vigor and resistance Dry small shrubs and groundcovers strengthen the soil-fixing capacity of the slope and improve the stability of the slope.