1. College of Geological Engineering and Geomatics, Chang'an University, Xi'an Shaanxi 710054, China;
2. Open Research Laboratory of Geotechnical Engineering, MLR, Xi'an Shaanxi 710054, China;
3. Key Laboratory for Geo-Hazards in Loess Area, MLR, Xi'an Shaanxi 710054, China
Dynamic Response of Loess Stepped Slopes Subjected to Vehicle Vibration
LI Peng1,2,3, GUO Min2, LIU Shi-jie2, XU Ji-wei1,3
1. College of Geological Engineering and Geomatics, Chang'an University, Xi'an Shaanxi 710054, China;
2. Open Research Laboratory of Geotechnical Engineering, MLR, Xi'an Shaanxi 710054, China;
3. Key Laboratory for Geo-Hazards in Loess Area, MLR, Xi'an Shaanxi 710054, China
摘要This work aims to provide theoretical support for the study of structural loess degradation and slope disaster mechanism under automobile vibration. The research on the dynamic response law of loess stepped slopes under the action of automobile vibration is currently insufficient. Thus, this study takes the loess stepped slope located in Anzi road as the research object and summarizes its deformation modes, failure modes, and characteristics. Vehicle vibration signals of different types, speeds, and positions are obtained by field investigation and monitoring. The following conclusions are derived on the basis of the statistical analysis of the monitoring signals. (1) The vibration response of the slope increases with the increase of vehicle load. As the vehicle load increases, the area with strong vibration response gradually migrates from the second-to the first-grade slope. (2) The amplification effect of the vibration wave is strong when the vehicle load is small and weak when the vehicle load is large. Moreover, the Z-direction wave appears as a vibration attenuation. (3) The X-direction wave's frequency distribution presents a single peak, and the main frequency is concentrated in 17-65 Hz. The Z-direction wave's frequency distribution presents multiple peaks, and the main frequency is concentrated in 22-185 Hz. (4) The frequency variation is not greatly relevant to the type, speed, and position of the vehicle but is determined by the slope itself. (5) The stress state of the loess stepped slope changes under vehicle vibration. In the design of loess stepped slopes, the slope gradient should not be considerably large, and the first-and second-grade slopes should not be extremely high. Furthermore, slope protection should be focused on the first-and second-grade slopes. This research reveals the dynamic response of loess stepped slopes subjected to vehicle vibration, and the results may help establish theoretical and practical methods to protect this slope type.
Abstract：This work aims to provide theoretical support for the study of structural loess degradation and slope disaster mechanism under automobile vibration. The research on the dynamic response law of loess stepped slopes under the action of automobile vibration is currently insufficient. Thus, this study takes the loess stepped slope located in Anzi road as the research object and summarizes its deformation modes, failure modes, and characteristics. Vehicle vibration signals of different types, speeds, and positions are obtained by field investigation and monitoring. The following conclusions are derived on the basis of the statistical analysis of the monitoring signals. (1) The vibration response of the slope increases with the increase of vehicle load. As the vehicle load increases, the area with strong vibration response gradually migrates from the second-to the first-grade slope. (2) The amplification effect of the vibration wave is strong when the vehicle load is small and weak when the vehicle load is large. Moreover, the Z-direction wave appears as a vibration attenuation. (3) The X-direction wave's frequency distribution presents a single peak, and the main frequency is concentrated in 17-65 Hz. The Z-direction wave's frequency distribution presents multiple peaks, and the main frequency is concentrated in 22-185 Hz. (4) The frequency variation is not greatly relevant to the type, speed, and position of the vehicle but is determined by the slope itself. (5) The stress state of the loess stepped slope changes under vehicle vibration. In the design of loess stepped slopes, the slope gradient should not be considerably large, and the first-and second-grade slopes should not be extremely high. Furthermore, slope protection should be focused on the first-and second-grade slopes. This research reveals the dynamic response of loess stepped slopes subjected to vehicle vibration, and the results may help establish theoretical and practical methods to protect this slope type.
基金资助:Supported by the Open Fund Project of Key Laboratory for Geo-Hazards in Loess Area, MLR(No.KLGLAMLR201506)
通讯作者:
LI Peng
E-mail: lipeng198782@163.com
引用本文:
李鹏, 郭敏, 刘世杰, 徐继维. 汽车振动作用下黄土阶状坡动力响应规律[J]. Journal of Highway and Transportation Research and Development, 2019, 13(3): 33-43.
LI Peng, GUO Min, LIU Shi-jie, XU Ji-wei. Dynamic Response of Loess Stepped Slopes Subjected to Vehicle Vibration. Journal of Highway and Transportation Research and Development, 2019, 13(3): 33-43.
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2019, Vol. 13 
