堆积层斜坡地震响应规律的虚拟试验分析

发布时间：2018-07-21 20:14

【摘要】：运用平面快速拉格朗日有限差分计算方法,研究了地震作用下攀田高速公路望江岭隧道出口堆积层斜坡的动力响应规律,就地震加速度幅值、频谱特性等相关参数对斜坡动力系统的影响进行了敏感性讨论,并进一步将虚拟试验计算结果与原型现场实测数据进行对比分析。结果表明:(1)输入地震加速度幅值特别是峰值强度的提高不仅对堆积体累积塑性变形具显著影响,且于堆积体稳定状态具有较强的扰动效应;(2)不同地震波动激励下,堆积层斜坡水平位移变化规律较大程度上依赖于所输入动载荷的固有属性;(3)峰值强度为0.49m/s2的Loma Prieta水平地震加速度作用20s末,数值虚拟试验结果与现场测斜同震相对位移在量值与分布趋势方面均较为接近。
[Abstract]:By using the plane fast Lagrangian finite difference method, the dynamic response law of the accumulation layer of Wangjiangling Tunnel exit of the Pantian Expressway under earthquake action is studied. The amplitude of the seismic acceleration is obtained. The sensitivity of frequency spectrum and other related parameters to the slope dynamic system is discussed, and the simulation results of virtual test are compared with the field measured data of the prototype. The results show that: (1) the increase of the amplitude of the input seismic acceleration, especially the peak strength, not only has a significant effect on the cumulative plastic deformation of the accumulation body, but also has a strong disturbance effect on the stable state of the accumulation body, and (2) under the different earthquake wave excitation, The variation of horizontal displacement of the accumulative slope depends largely on the inherent properties of the input dynamic load. (3) the acceleration of the Loma Prieta horizontal earthquake with the peak strength of 0.49m/s2 is at the end of 20s. The numerical simulation results are close to those of the in-situ oblique coseismic relative displacement in terms of magnitude and distribution trend.
【作者单位】：四川省交通运输厅交通勘察设计研究院公路工程咨询部;西南交通大学土木工程学院;
【基金】：国家重点基础研究发展计划(973)项目,项目编号2008CB425802
【分类号】：U412.22

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