Research On Dynamic Response Law Of Slowly Inclined Slope Under Traffic Load

With the rapid development of the transportation industry,large-scale road and bridge projects have been constructed and operated,and the increasing traffic flow,driving speed and vehicle weight have increased the vibration intensity of the surrounding environment caused by traffic loads.The rock-soil vibration caused by traffic load has attracted more and more attention from experts and scholars.Widely distributed gently inclined bedding slopes will cause a large number of such slopes to be affected by traffic loads for a long time.Once the slope becomes unstable,the destructive force is huge.Therefore,it is of great significance to carry out research on the dynamic response of gently inclined bedding slopes under traffic load.This paper summarizes the research results of the domestic and international slope dynamic response,traffic load model,weak interlayer dynamic response and the factors affecting the gentle slope slope,using a combination of theoretical analysis,on-site collected data analysis and numerical simulation.The dynamic response law of gently inclined bedding slope under traffic load was studied,and the following results and conclusions were obtained:(1)Sort out typical slow-dipping bedding slope cases,and analyze the geological environment characteristics of this slope from the aspects of slope geometry,stratigraphic lithology and lithology combination,geological structure and hydrogeology;and take the statistical results as The geological conceptual model of gently inclined bedding slope is established,which provides a foundation for the establishment of dynamic numerical model.(2)On-site collection of slope rock vibration data caused by traffic load,qualitative analysis of useful signal frequency domain and noise signal frequency,complete complete empirical modal decomposition method to decompose—reconstruct vibration data,and achieve signal-to-noise separation reduction The purpose of noise is to provide guarantee for accurate analysis of vibration data characteristics.(3)The probability and mathematical statistics method and the fast Fourier transform method are used to analyze the time-frequency characteristics of the vibration data to obtain the vibration intensity and frequency of the rock and soil caused by traffic loads,and the attenuation characteristics of the vibration intensity are fitted and analyzed.(4)Combined with the current status of dynamic load model research,based on the collected vibration data analysis results,the equivalent traffic load models of sine wave,half sine wave and measured irregular wave were established.Combining qualitative analysis and numerical simulation quantitative calculation,it is determined that the measured irregular wave is used as the load model for numerical simulation calculation.(5)The finite element numerical dynamic model was established according to the geological conceptual model,and the dynamic responses of homogeneous slope,homogeneous bridge foundation slope and bridge foundation slope with weak interlayer were calculated.From acceleration,stress,displacement response law and Four aspects of the dynamic change of slope stability are analyzed,and the traffic dynamic response law of gently inclined bedding slope is analyzed.(6)Compare the dynamic calculation results of the slope with or without bridge foundation,analyze the influence law of the bridge foundation on the dynamic response;The influence law of slope dynamic response.By comparing the dynamic calculation results of the slope with or without interlayer,the influence of interlayer on the dynamic response of the slope is analyzed.The dynamic response of the interlayer parameters was calculated from two aspects: the thickness of the interlayer,and the influence of the interlayer parameters on the dynamic response of the slope was analyzed.Calculate the dynamic response of the bridge base and the interlayer relative position,and analyze the dynamic response of the bridge base above and below the interlayer and the bridge base crossing the interlayer.