Seismic Dynamic Response And Reinforcement Analysis Of High Slope In High Intensity Area

With the construction of high-speed railway infrastructure by the state,more and more high-speed railways are developing to the western regions.But mostly in the western region of our country exists the earthquake fault zone,seismic intensity and generally higher,of high speed railway subgrade slope stability is put forward higher requirements,combined with the subgrade slope dynamic protection from theory to design has not yet formed a complete system,therefore to carry out the fault zone under high intensity seismic dynamic response of the slope and reinforce to speed up the development of high-speed railway construction and western China has important practical significance.Based on the cutting slope of the yunnan section of the shanghai-kunming passenger dedicated line,this paper systematically studied the dynamic response and reinforcement of the cutting slope under the high-intensity fault zone through theoretical analysis and numerical simulation,and obtained the following research results:(1)FLAC3D finite difference software was used to study the dynamic response of cutting high slope under horizontal seismic wave and vertical seismic wave respectively in the fault zone with high intensity,and the dynamic response between them was compared and analyzed,and the influence of seismic wave on dynamic response such as displacement,acceleration and stress was obtained.(2)Based on the rock and soil layers along the yunnan section of the shanghai-kunming passenger dedicated line,the influence of slope geometry,different types of rock and soil layers and physical properties of rock and soil layers on the dynamic response of cutting high slope is obtained,and the sensitivity of various parameters to the stability of cutting high slope is obtained.(3)The dynamic response of the high cut slope under the prestressed anchor cable reinforcement measures is studied,and the reinforcement effect is studied.(4)On the basis of applying prestressed anchor cable reinforcement measures to the slope,the effects of ground motion parameters and anchor cable parameters on the reinforcement effect were studied respectively,and the sensitivity of various parameters on the reinforcement effect was obtained.(5)In the fault zone under the background of high intensity,the rope-pile-soil slope are proposed composite structure or cable-wall-soil reinforcement measures of the application of composite structure,and compares the single prestressed anchor cable reinforcement effect analysis,draw a line-composite pile-soil structure or cable-wall-soil composite structure is more suitable for high intensity under the fault zone of slope reinforcement.