| The soil disposal site is composed of loose rock and soil,and its main characteristics are poor stability,susceptibility to collapse and landslides when encountering water.Once instability occurs,it can cause significant economic losses and casualties.Taking the Shougang Hexi soil disposal site as an example,which is adjacent to a school and residential area to the north,it is necessary to ensure the safety and storage capacity of the soil disposal site to the maximum extent.Therefore,this paper conducts research on the evolution mechanism and control technology of slope sliding in complex situations in the soil disposal site.The main contents are as follows:1.Assessing the risk of steep loose soil slope disasters in the soil disposal site based on GIS technology.The relevant factors and their data for slope disaster assessment are determined through big data analysis theory.By combining fuzzy matter-element and analytic hierarchy process,the framework of disaster assessment and the weights of relevant factors are determined.TIN graphs of different factors are drawn using GIS,and the TIN graphs of different factors are superimposed using weighted overlay method to generate GIS disaster risk evaluation maps,determine unstable areas,and propose preventive measures to reduce the risk of landslides and debris flows.2.The dynamic heap conditions and the evolution mechanism of slope sliding in the soil disposal site are systematically studied.The safe distance for the upper flat plate to continue stacking is determined,and the stress and strain of the lower rock and soil mass in the soil disposal site are found to be directly proportional to the upper stacking load.The influence mechanism of stress redistribution on the deformation of rock and soil mass under multiple stacking conditions is revealed by the theory of stress,indicating an inverse relationship between stress and slope stability.It is concluded that shallow failure is the main type of slope failure.3.The evolution law of rainfall on slopes in complex environments is systematically studied.The relationship between different rainfall conditions and moisture content is determined using the strength reduction method and regression analysis.The relationship between rainfall and shear strength is established.The stress-strain evolution characteristics of slopes under different rainfall conditions are analyzed through numerical simulation,revealing the mechanism of slope sliding under different rainfall conditions.To prevent debris flows,drainage ditches are designed at the foot of the slope.4.The infiltration law of rainfall under dynamic stacking conditions is studied systematically.Firstly,the solid-liquid coupling model is established based on the coupling model under the action of stacking stress.Numerical simulation is used to analyze rainfall infiltration.Considering the complexity of the infiltration law,the infiltration of the slope is studied from the perspectives of time and space,clarifying that the depth of slope infiltration is directly proportional to the rainfall value from a temporal perspective,and the ratio of infiltration depth from a spatial perspective is: slope surface > slope foot >slope top.The stress variation pattern is also related to the infiltration depth,with a sudden change in stress at the wet front.The influence law of dynamic stacking on rainfall infiltration is revealed. |
