摘要
多级格构式框架锚杆支护结构常被用于西部地震频发山区铁路交通生命线沿线的边坡治理。但现有研究多集中于单级边坡,对于多级边坡的研究较少。依托实体工程,基于FLAC3D建立三级格构式框架锚杆支护边坡的三维数值模型,施加不同峰值加速度的Landers地震波,分析三级格构式框架锚杆支护边坡的地震动力特性。通过对比数值模拟结果与振动台试验结果,验证了数值模型的正确性。结果表明:水平加速度放大系数与垂直加速度放大系数总体随边坡高度增大而增大,同时在平台处加速度放大系数急剧减小;Landers地震波激励时轴向应力响应分为3个阶段,总体依然呈现下部锚杆需要更高的抗拉强度的规律;各级框架梁在地震激励下均呈现“平动+转动”的复合变位模式。
Multi-stage lattice frame anchor bolt support structures are often used for slope treatment along the railway transportation lifeline in mountainous areas with frequent earthquakes in China’s western region.However,most of the existing studies focus on single-stage slopes,while there are relatively fewer studies on multi-stage ones.Relying on a physical project,a three-dimensional numerical model of the three-stage lattice frame anchor bolt supported slope was established based on FLAC3D.The seismic dynamic characteristics of the three-stage lattice frame anchor bolt supported slope were analyzed by applying Landers seismic waves with different peak accelerations.The correctness of the numerical model was verified by comparing the results of the numerical simulation with those of the vibrating stand test.The results show that the horizontal acceleration amplification coefficient and the vertical acceleration amplification coefficient generally increase with the increase of slope height,while the acceleration amplification coefficient decreases sharply at the platform.The axial stress response of under Landers seismic wave excitation is divided into three stages,and overall,it still shows the rule that the lower anchor rods need higher tensile strength.All stages of frame beams exhibit a composite displacement mode of“translational+rotational”under seismic excitation.
作者
郑阳岗
鲁立
周应华
朱鹏宇
林宇亮
ZHENG Yanggang;LU Li;ZHOU Yinghua;ZHU Pengyu;LIN Yuliang(China Railway No.2 Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China;National Engineering Research Center of High Speed Railway Construction Technology,Central South University,Changsha Hunan 410075,China;School of Civil Engineering,Central South University,Changsha Hunan 410075,China)
出处
《中国铁路》
北大核心
2025年第10期31-38,共8页
China Railway
基金
中国中铁股份有限公司科技研发项目(2022-重大-03)
国家自然科学基金面上基金项目(51878667)。
关键词
高速铁路
地震动力特性
数值仿真
三级格构式框架锚杆
地震波激励
锚杆支护边坡
high-speed railway
seismic dynamic characteristics
numerical simulation
three-stage lattice frame anchor bolt
earthquake excitation
seismic wave excitation
anchor bolt supported slope
