Based On The Influence Of Dynamic Load Disturbance Study On Mechanical Response Of Gravel Soil Landslide

Landslide is one of the serious geological disasters facing China today,which not only causes the loss of industrial and agricultural production,people's lives and property,but also often causes some secondary disasters in water conservancy and hydropower projects,roads,railways,river transportation and Marine projects,seriously endangering human safety.The failure of gravel soil slope is often caused by shear failure,the key to stability analysis and treatment of the slope lies in the analysis and study of mechanical properties of gravel soil,therefore,the study of mechanical properties of gravel soil has become an important task of slope stability analysis and disaster prevention.In this paper,the static load and dynamic load triaxial test were carried out on five kinds of gravel soil with different grades through indoor triaxial test.Analysis and research of gravel soils with different gravel content mixed sand content of different shear strength in both cases,hand in hand action under the influence of load disturbance,gravel soil triaxial test,the analysis of dynamic load disturbance after the change rule of gravel soil shear strength,further,the contrast analysis of static load and dynamic load disturbance under both axial strain and the rule of variation of principal stress difference,explore the relationship between performance and sliding mechanism of self-organization of gravel soils,the study of gravel soil particle structure inside the arch effect,and effect,bite the influence of the friction effect of gravel soil mechanics performance.According to the design of the test scheme,under the influence of different confining pressures of 100 kPa,200kPa and 300 kPa,five groups of gravel soil of different grades were set up for triaxial test of static load and dynamic load.Based on the obtained data,the classical coulomb-mohr yield theory was used for analysis and statistical calculation to draw the Moore circle and shear strength failure envelope,and the shear strength parameters were compared.The shear strength of gravel soil under static load and dynamic load was analyzed.The research results of this paper are as follows:(1)the increase of confining pressure is proportional to the difference of principal stress,but when the axial strain of the sample reaches a certain value,this relationship ceases to exist,and then the slip line appears until the failure.(2)the shear strength of gravel soil increases with the increase of gravel content.This is because when the content of gravel is about 70%,the gradation of sand,soil and gravel particles is relatively good.Large particles play the role of skeleton,medium particles play the role of maintenance,and small particles fill the pores between gravel and sand,thus improving its bearing capacity.(3)with the increase of gravel content,the main stress difference of the sample decreases,which is due to the decrease of fine sand content,which weakens the cementation between gravel particles and sand.(4)under the influence of dynamic load interference,the principal stress difference and internal friction Angle of the samples with the five proportions were significantly higher than that under static load.This was because the particles were rearranged by vibration,and the fine particles filled the pores between the gravel particles,increasing the compactness of the soil and increasing the shear strength.Under the interference of dynamic load,there are two possibilities for the stability of gravel slope: first,immediate landslide;The second is greater stability.Therefore,the stability of slope is related to factors such as confining pressure and loading mode.(5)the change of cohesion c and internal friction Angle value will cause the change of stability coefficient,thus affecting the stability of landslide.The coefficient of stability is directly proportional to the change of the value of cohesive force c,and the coefficient of stability increases with the increase of cohesive force c.The coefficient of stability is directly proportional to the change of internal friction Angle.In this paper,the static load and dynamic load triaxial test were carried out on five kinds of gravel soil at different levels,and the shear strength variation law of gravel soil at different levels and under different confining pressures under static load was analyzed.And the variation law of shear strength after dynamic load interference;Finally,a comparative analysis is made.It provides valuable reference for slope control engineering and slope prediction.