Zhou Yuanyuan, Zhao Fei, Shi Zhenming
College of Transportation Engineering, Nanjing Tech University, Nanjing 211816, China.
Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China.
Materials (Basel). 2024 Dec 4;17(23):5939. doi: 10.3390/ma17235939.
The issue of slope stability in earthquakes has become increasingly prominent with the construction of many infrastructure projects such as highways, bridges, and tunnels. To explore the dynamic response characteristics of bedding rock slopes in an earthquake, the three-dimensional dynamic finite-difference method (TDD-FDM) in this study is used to establish simplified rock slope models, taking a bedding rock slope with alternatively distributed soft and hard rock layers in Yunnan, China as a prototype. The dynamic response mechanism of layered rock slopes containing different thicknesses, locations, and quantities of soft rock layers was studied under different excitation directions of seismic waves. The main findings are that the propagation of seismic waves at different rock layer structures has directionality, which causes the strongest seismic response to be all located in the upper or middle parts of the slope; the influence of rock structures on seismic response in layered rock slopes is in the order of thickness > quantity > location; the acceleration amplification effect of a slope under multi-directional seismic wave excitation exhibits the phenomena of differential amplification and coupling amplification; and the acceleration amplification factors of a slope with increasing peak ground acceleration from 0.05 g to 0.20 g show two trends: increasing-decreasing and continuous increasing. The findings of this study can be a reference for studying the dynamic response of rock slopes in strong earthquakes.
随着公路、桥梁和隧道等众多基础设施项目的建设，地震作用下边坡稳定性问题日益突出。为探究顺层岩质边坡在地震中的动力响应特性，本研究采用三维动力有限差分法（TDD - FDM）建立简化岩质边坡模型，以我国云南某软硬岩层交替分布的顺层岩质边坡为原型。研究了含不同厚度、位置及数量软岩层的层状岩质边坡在地震波不同激励方向下的动力响应机制。主要研究结果表明：地震波在不同岩层结构中的传播具有方向性，致使最强地震响应均位于边坡上部或中部；岩层结构对层状岩质边坡地震响应的影响程度依次为厚度＞数量＞位置；边坡在多向地震波激励下的加速度放大效应呈现出差异放大和耦合放大现象；边坡的加速度放大系数随地震峰值加速度从0.05g增加到0.20g呈现出先增大后减小和持续增大两种趋势。本研究成果可为强震作用下岩质边坡动力响应研究提供参考。
