地震作用下锚固边坡的动力响应试验与数值分析  

Dynamic response test and numerical analysis of anchored slope under earthquake action

作　　者：张妙芝 李楠[2] 周运锋 ZHANG Miaozhi;LI Nan;ZHOU Yunfeng(Shaanxi Railway Institute,Weinan,Shaanxi 714000,China;Chang’an University,Xi’an 710054,China;Yanliang track maintenance division of China railway Xi’an group Co.,Ltd.,Yanliang,Shaanxi 711799,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000 [2]长安大学,西安710054 [3]中国铁路西安局集团公司阎良工务段,陕西阎良711799

出　　处：《自动化与仪器仪表》2024年第3期67-71,共5页Automation & Instrumentation

基　　金：国家自然科学基金(41440021,41572261,4197070600);渭南市基础研究科研课题项目(ZDYF-JCYJ-301);陕西铁路工程职业技术学院科研基金项目(2023KYYB-24)。

摘　　要：为了探究在地震作用下锚固土质边坡的动力响应规律,采用1∶7缩尺模型振动台试验,分别以Kobe波、汶川波和El Centro波作为输入波,监测坡体加速度,以此来研究锚固边坡加速度的响应规律和地震动参数(地震波类型、地震波幅值)对坡体加速度的影响,用数值模拟手段对试验结果进行了验证。结果表明:在地震作用下,随着边坡的高度上升,PGA放大系数随之增大,且在坡肩处达到峰值,即动力加速度响应最为强烈的位置在边坡顶部;在水平方向上,坡体的PGA放大系数无明显变化。当对于同一测点输入不同地震波时,Kobe波作用下的锚固坡体动力加速度响应最大,汶川波最小;对于同一种地震波而言,各测点处的PGA放大系数随着地震波幅值的逐渐增大,呈现出“先减小、后增大”的趋势,且边坡顶部的变化趋势更明显。The 1∶7 scale model shaking table test is adopted to explore the dynamic response law of the anchored soil slope under dynamic action.Inputting Kobe wave,Wenchuan wave and El Centro wave in the test and monitoring the slope acceleration to study the response law of the anchored slope acceleration and the effect of ground motion parameters(the seismic wave type and the seismic wave amplitude)on the slope acceleration.The experimental results were validated using numerical simulation methods.The results show that under the dynamic action,the anchored slope has obvious amplification effect in the vertical direction,and the dynamic response is the strongest at the top of the slope,while the amplification effect of the slope in the horizontal direction is not obvious.When different types of seismic wave are input,the dynamic acceleration response of the anchored slope under the action of Kobe wave is the highest,while the Wenchuan wave is the lowest.For the same seismic wave,with the increase of seismic wave intensity,the amplification coefficient of PGA at each measuring point shows a trend of“decreasing first and then increasing”,and the trend of change at the top of the slope is more obvious.

关 键 词：土质边坡 锚固系统 地震作用 振动台试验 数值模拟 

分 类 号：TP202[自动化与计算机技术—检测技术与自动化装置] P642[自动化与计算机技术—控制科学与工程]