Research On Seismic Response Of Fractured Rock High Slope Under Oblique Incident Conditions

Developing the central and western regions is an important national development strategy.In large-scale infrastructure projects in the central and western regions,an increasing number of high rock slope engineering problems urgently need to be solved.This article selects the seismic response of high rock slopes as the research topic,and selects mining slopes in Zhaotong City,Yunnan Province as the research object.Based on extensive literature review at home and abroad,numerical calculation and analysis methods are used to calculate and analyze the seismic response of the target slope under conditions such as static force,seismic fortification intensity,different intensities of seismic motion,different crack distribution conditions,and oblique seismic input,The main conclusions are as follows:(1)Under static force,the horizontal stress,vertical stress,and maximum principal stress in the rock mass of the target slope show stress concentration,and the slope is in a basically stable state.After slope cutting treatment,the internal force distribution of the slope rock mass tends to ease,enhancing the stability of the target slope.(2)Under horizontal seismic action equivalent to the basic fortification intensity,the target slope can maintain basic stability,and the seismic response of the slope rock mass increases with the increase of input seismic intensity,which is also related to the characteristics of input seismic waves.(3)The enhanced seismic response of fractured rock masses to horizontal acceleration of slopes is stronger than that of intact rock masses.Cracks containing weak soil have a certain strengthening effect on the seismic response of the slope surface.Under the action of horizontal seismic motion,the seismic response at the foot and top of the slope near the slope surface is relatively large.The horizontal acceleration seismic response of the rock mass at the top of the slope and inside the slope is affected differently by the distribution of cracks.The distribution characteristics of cracks have little effect on the maximum principal stress seismic response of the rock mass near the slope.Within the slope,the seismic response of the rock mass within a certain range around the crack is strengthened to a certain extent.(4)Under the condition of oblique incidence of seismic motion,the horizontal seismic response at the foot of the slope will be affected by the distribution of cracks within the slope,resulting in a decrease in seismic response(short crack distribution,medium long crack distribution)and an increase in seismic response(multi crack distribution,long crack distribution);At the top of the slope near the slope surface,the influence of oblique incidence on the horizontal acceleration seismic response is smaller than that of horizontal incidence.Under the two input conditions,the overall difference in seismic response to the maximum principal stress is relatively small,and specific analysis is needed for individual crack distribution conditions.The seismic response at the top and inside of the slope is greatly affected by the distribution of cracks.According to the results of disaster investigation and calculation analysis,separate calculation and analysis should be conducted based on the specific situation of each project.The research results of this article have certain reference significance for the study of seismic response of high rock slopes,providing reference for engineering practice and related research,and have good research significance and engineering value.