Dynamic Response Analysis Of Anchored Rock Slope With Single Weak Surface

China has a vast territory and a large mountainous area.Especially in the western part of China,there are a large number of natural and artificial slopes.In recent years,the earth's crustal activity has been frequent.Several large earthquakes with strong destructive force and wide area of action have occurred in China.The geological disasters such as collapse,debris flow and landslide caused by earthquakes have destroyed a large number of ground buildings and posed a great threat to the buildings and people's lives in mountainous areas of our country.In order to meet the needs of society and engineering,the study of dynamic response of slope has become a hot topic in slope engineering and related fields.Firstly,this paper summarizes the research on the influencing factors of dynamic stability of rock slope by scholars at home and abroad.It is found that the instability of rock slope under earthquake is affected by many factors,among which the direct factor is earthquake.The rock slope is classified according to the type of rock mass structure,and the failure mode of rock slope under dynamic action is studied.The dynamic response analysis of bedding rock slope sliding along the structural plane is proposed.Based on Xiang jia shan landslide project,a general model of bedding rock slope is established.Based on the analysis of seismic performance of common supporting structures,it is found that the effect of bolt(cable)reinforcement on rock slope is good,so the prestressed anchor cable is used to support bedding rock slope.Through FLAC3 D,the dynamic stability of bedding anchored rock slope is analyzed,and the dynamic response law of the slope is summarized,which provides a theoretical basis for simplified assumptions of bedding rock slope calculation model.Based on the quasi-static method and the dynamic principle,the dynamic equilibrium equation of bedding rock slope under dynamic action is established.The analytical method is used to solve the displacement solution at the slip surface of the slope and the axial force solution of the bolt,and an applicable formula for calculating the axial force of the bolt is proposed.The influence of ground motion parameters and anchorage parameters on the peak displacement of slope slip surface is analyzed.Finally,the dynamic response law of bedding anchored rock slope is summarized and summarized,and some optimization suggestions for seismic design of slope are put forward,and several new seismic anchorage devices are recommended.The main conclusions are as follows:?The influencing factors of slope stability can be divided into internal and external factors.The main internal causes are slope topography,geological structure and rock and soil properties,while the external factors are a series of external conditions of the slope.The effect of bolt(cable)reinforcement on rock slope is good,and the failure control interface of bolt(cable)reinforcement system is grouting and rock interface.?FLAC3D is used to study the dynamic response law of bedding anchored rock slope,and the anchor cable can effectively improve the overall seismic performance of the slope.Acceleration amplification coefficient decreases with the increase of peak acceleration.When the seismic frequency is close to the natural frequency of slope,the acceleration response is larger.Waveform and duration have little influence on the acceleration amplification coefficient.?Acceleration amplification coefficient decreases with the increase of anchorage length,increases with the increase of anchorage spacing,and is insensitive to anchorage inclination angle.When the seismic intensity is small,the axial force of the bolt reaches the maximum near the slope waist.With the increase of the seismic intensity,the internal force of the roof bolt rises rapidly,and finally the maximum is at the same position as the slope waist.?Based on the theoretical formulas,the influence of seismic parameters and anchorage parameters on the peak displacement of slope slip surface is analyzed.It is concluded that the peak displacement increases with the increase of the peak acceleration.When the seismic frequency is close to the natural frequency of the slope,the peak displacement at the slip surface is the largest.The peak displacement at the slip surface is the largest under the action of Taft wave,followed by EL wave and Kobe wave.The peak displacement at slip surface decreases with the increase of anchorage length,increases with the increase of anchorage spacing,and is insensitive to anchorage inclination angle.In this paper,the dynamic response of bedding anchored rock slope is analyzed from two aspects of numerical simulation and theoretical analysis.The dynamic response law of bedding anchored rock slope is summarized.The influence of seismic parameters and anchorage parameters on the dynamic response of rock slope is analyzed,which can provide reference for dynamic response research and seismic design of rock slope.