Study On Dynamic Response Characteristics And Sliding Mechanism Of Rock Slope With Mud Interlayer

China is an earthquake prone country.Landslide,debris flow and other secondary geological disasters induced by earthquake dynamic effect directly threaten the life and property safety of the people in the disaster area.Argillaceous intercalation is a kind of special weak structural plane widely developed in layered rock mass area,which has a controlling effect on the stability of rock slope.Under the action of cyclic dynamic loads such as natural earthquake and blasting construction,the engineering properties of argillaceous intercalation are deteriorating,which leads to the sliding instability of rock slope with argillaceous intercalation.Based on this,to explore the dynamic effect and disaster mechanism of rock slope with argillic interlayer under cyclic dynamic load has significant engineering significance for preventing the sliding instability disaster of complex rock slope in the area with argillic interlayer.Cyclic dynamic load is an important factor to induce sliding failure of slope,especially the rock slope with argillic interlayer.In order to reveal the failure mechanism of rock slope with argillic intercalation under cyclic dynamic load and the influence of different properties of argillic intercalation on the dynamic instability of rock slope with argillic intercalation,a slope model with different thickness,inclination and clay content of argillic intercalation was constructed on the premise of following the similar relationship In addition,the parameter sensitivity of argillic interlayer is analyzed.Then,according to the law of conservation of energy,based on the Newmark slide displacement method,considering the cumulative damage effect of blasting,the strength reduction factor of argillic interlayer is introduced,and the calculation method of cumulative sliding amount of rock slope with argillic interlayer under multiple blasting vibration and the prediction method of critical blasting loading times are established.The main work and achievements are as follows:(1)Based on the principle of similar materials,a small-scale shaking table model test for dynamic response of rock slope with argillaceous interlayer is designed.It includes the calculation of similarity relationship,selection of model experimental materials,design and manufacture of model box,pouring and maintenance of model slope,layout of acceleration sensor,formulation of loading scheme and loading,etc.(2)Based on the test results,the macro failure characteristics and the influence law of different factors under different working conditions are systematically summarized.With the decrease of the thickness of the argillic intercalation,the ability of resisting deformation of the argillic intercalation is weakened,and the model slope is more prone to overturning failure under cyclic dynamic load;with the increase of the inclination angle of the argillic intercalation,the failure speed and degree of the argillic intercalation increase;with the increase of the clay content of the argillic intercalation,the failure mode of the argillic intercalation gradually develops from shear failure to creep failure And the larger the clay content is,the worse the dynamic stability of the model slope is.(3)The elevation amplification effect of rock slope with argillic interlayer and its influence mechanism on dynamic stability are analyzed.The model slopes under different loading conditions show elevation amplification effect and surface amplification effect;the thickness,dip angle and clay content of the argillaceous interlayer have an important influence on the dynamic stability of the rock slope with argillaceous interlayer;with the progress of loading,the model slopes with different thickness,dip angle and clay content of the argillaceous interlayer are constantly sliding failure With the increase of dip angle and clay content,the failure speed of the argillaceous interlayer increases,and both of them show the phenomenon of accelerated failure.(4)Based on the grey system theory and grey correlation analysis,the parameter sensitivity of the development characteristics of argillaceous interlayer on the dynamic stability of complex rock slope is studied.The angle of argillic interlayer is the most sensitive to the dynamic stability of model slope,the thickness of argillic interlayer is the second,and the clay content of argillic interlayer has the least influence on the dynamic stability of model slope.Compared with the nature of argillic interlayer itself,more attention should be paid to the structural problems of argillic interlayer in practical engineering.(5)Based on the conservation and transformation of energy,the Newmark slide displacement method is used to calculate the vibration slip and predict the critical instability of rock slope with argillaceous interlayer.Through the engineering practice and model test verification,the calculation results are reliable,which has a certain reference significance for the calculation of cumulative slip and prediction of instability failure of rock slope with argillic interlayer under dynamic load.