Research On The Slope Stability With Cracks Considering Non-uniformity Of Soil

As a widely distributed geological body,the slope structure is widely distributed all over the world.In the traditional slope stability analysis process,the physical and mechanical properties of the slope material are mainly based on the homogenization theory,ignoring the non-uniformity of the soil distribution.In addition,affected by the natural environment(rainfall,earthquake,etc.)and human activities,there are often initial cracks in the slope.Ignoring the inhomogeneous characteristics of the soil and the initial fissures will cause the slope stability assessment results and failure modes to be different from the real slope status,resulting in slope instability disasters and threats to the lives and properties of the surrounding people.Therefore,this paper takes a cracked slope stability evaluation project in Zhenjiang City as the background,based on the Monte Carlo stochastic algorithm,under the premise of considering the non-uniformity of soil strength,the distribution characteristics and expansion characteristics of the cracks are studied on the slope stability.The specific research content is as follows:1)Introduced in detail the location of the slope project,surrounding environment,geological conditions,bad geological features,and hydrological and rainfall conditions;described the status quo of landslide disasters,several typical damaged sections;Man-made activities and other aspects analyze and discuss the reasons for slope instability.(Chapter two)2)Through indoor tests,the strength characteristics of the slope soil were tested,which proved the non-uniformity characteristics of the slope soil;the limit analysis finite element method was used to construct the edge considering the non-uniformity characteristics of the soil based on the Monte Carlo algorithm.The slope stability analysis model is used to verify the rationality of the model;the above model is used to study the influence of the dispersion of soil strength(non-uniformity coefficient,non-uniform distribution length)on slope stability.(Chapter three)3)Through theoretical analysis,research the classification characteristics of slope cracks and the main reasons for the cracks;based on the distribution characteristics of the cracks,the distribution characteristics of the cracks(top,middle front,middle,middle and rear)are studied through numerical analysis.And bottom),crack inclination(60°,75°,90°,105°,120°)and crack length(0,2,4,6,8,10m)on the slope stability.The results show that the cracks at the top and toe of the slope have a greater impact on the stability of the slope;when the direction of the crack inclination is parallel to the slope shear zone,the safety factor of the slope drops the most;with the increase of the crack depth,the safety factor of the slope Gradually reduce,but the reduction amplitude gradually decreases.(Chapter four)4)Refer to relevant literature,expound the influence of rainfall infiltration on soil strength,crack width and crack length;use numerical analysis to study the direction of crack development(60°,75°,90°,105° and 120°)And the influence of soil weakening radius(0.5,1,1.5,2m)on slope stability.The results show that when the development direction of the crack is parallel to the slope shear zone,the safety factor of the slope decreases the most;the soil around the crack.As the weakening radius increases,the slope safety factor gradually decreases.From the perspective of slope drainage and underground drainage,slope drainage measures are proposed.(Chapter five)...