摘要
【目的】岩质高边坡在地震动作用下发生失稳破坏会导致严重的经济损失和人员伤亡,开展考虑行波效应的地震动作用下岩质高边坡动力响应规律及其稳定性的研究具有重要的工程应用价值。【方法】采用数值仿真的方法,地震荷载类型为天然地震动,分析一致激励和行波激励作用下岩质高边坡的动力响应规律。【结果】结果显示:(1)两种激励方式下,滑动面是坡体内的剪切破坏区和坡顶一定竖向深度的拉伸破坏区贯通而成;(2)一致激励作用下,边坡的加速度、速度和位移的地形放大效应较为显著,但行波激励下,这种地形的放大效应仅在靠近坡面时明显;(3)一致激励条件下坡肩和靠近坡面中部位置的水平和竖向永久位移要远大于行波激励的水平和竖向永久位移,一致激励永久位移是行波激励的4.85~5.34倍。【结论】结果表明:(1)激励方式的不同不会影响地震动作用下边坡的破坏模式,滑动面的形成是渐进的;(2)一致激励相比行波激励的模拟结果偏保守;(3)行波激励条件下,地震波在坡体内和自由面附近的传播特征发生了显著的变化。研究成果揭示了地震波的行波效应对岩质高边坡动力响应的影响,可为边坡工程设计和施工提供有价值的参考。
[Objective]Under the action of seismic forces,unstable failure of rock slopes can lead to significant economic losses and casualties. Conducting research on the dynamic response and stability of rock slopes under seismic forces, considering theeffects of seismic waves, holds important engineering applications. [Methods]This paper employs numerical simulation method,with natural seismic loads, to analyze the dynamic response patterns of rock slopes under both uniform excitation and travelingwave excitation. [Results](1) Under both excitation method, the sliding surface is formed by the shear slip zone inside theslope and a certain vertical depth of tensile failure zone at the slope top. (2) Concerning the dynamic response of the slope, underuniform excitation, there is a significant topographic amplification effect on the slope′s acceleration, velocity, and displacement.However, under traveling wave excitation, this elevation amplification effect is only evident near the slope surface. (3) Underuniform excitation conditions, the horizontal and vertical permanent displacements at the slope shoulder and near the middle ofthe slope surface are much larger than the horizontal and vertical permanent displacements under traveling wave excitation. The permanentdisplacement under uniform excitation is 4. 85 to 5. 34 times that of traveling wave excitation. [Conclusion](1) The differentexcitation method do not affect the failure mode of the slope under seismic action, and the formation of the sliding surface isgradual. (2) The simulation result under uniform excitation are more conservative compared to those under traveling wave excitation.(3) Under the conditions of a traveling wave excitation, the propagation characteristics of seismic waves within the slope andnear the free surface undergo significant changes. The research findings in this paper reveal the impact of seismic wave travelingwave effects on the dynamic response of rock slopes, providing valuable references for engineering design and construction.
作者
杨卿
陈志亮
李国锋
李宁
YANG Qing;CHEN Zhiliang;LI Guofeng;LI Ning(School of Civil and Architectural Engineering,Xi′an University of Technology,Xi′an 710048,Shaanxi,China;State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China,Xi′an University of Technology,Xi′an 710048,Shaanxi,China)
出处
《水利水电技术（中英文）》
北大核心
2024年第9期164-177,共14页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(52179111,52309144)。
关键词
岩质高边坡
行波激励
一致激励
地形放大效应
动力响应
数值模拟
high rock slope
uniform excitation
traveling-wave excitation
topographic amplification effect
dynamic response
numerical simulation
