2.5维有限元分析高铁荷载下准饱和横观各向同性地基振动特性

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (15) : 298-308.

论文

高广运1,2，耿建龙1,2，张其唯3，张璐璐1,2，司志鹏4

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25D finite element analysis for vibration characteristics of quasi-saturated transversely isotropic foundation under high-speed railway load

GAO Guangyun1,2, GENG Jianlong1,2, ZHANG Qiwei3, ZHANG Lulu1,2, SI Zhipeng4

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摘要

为分析高铁荷载下准饱和横观各向同性地基振动特性，本文推导了准饱和横观各向同性地基2.5维有限元控制方程，建立了列车-轨道-准饱和横观各向同性地基2.5维有限元模型，对比研究了不同车速下饱和与准饱和横观各向同性地基的振动特性，分析了准饱和横观各向同性地基土体参数对振动特性的影响。研究结果表明：准饱和横观各向同性地基表面产生的向上和向下位移均大于饱和地基。不同车速下准饱和地基振动位移均大于饱和地基，但超静孔压远小于饱和地基；车速越高，饱和与准饱和地基表面振动位移越大而衰减越慢，超静孔压越大且衰减越快，轨道中心处准饱和与饱和地基位移相差越大。准饱和地基竖向振动位移和超静孔压随水平弹性模量和垂直弹性模量的增加而减小，随水平泊松比增加而增大，随垂直泊松比增加而减小，随垂直剪切模量增加而减小。垂直弹性模量较水平弹性模量对地面竖向振动位移影响更大。与水平泊松比相比，垂直泊松比对准饱和横观各向同性地基竖向振动位移峰值和超静孔压影响更大。

Abstract

To analyze the ground vibration due to high-speed train moving on quasi-saturated transversely isotropic foundation, the 2.5-dimensional finite element (2.5D FE) control equations of quasi-saturated transversely isotropic soil were proposed. A 2.5D FE model involving train, track, quasi-saturated transversely isotropic foundation was established. The ground vibration of saturated and quasi-saturated transversely isotropic foundations were compared at different train speeds. The influence of soil parameters on vibration characteristics of quasi-saturated transversely isotropic foundations were analyzed. The results show that the upward and downward ground displacements of the quasi-saturated transversely isotropic foundation are larger than those of the saturated once. The displacement of quasi-saturated foundation is larger than that of saturated foundation at different train speeds, but the excess pore water pressure is much smaller than that of saturated foundation. The higher the train speed, the larger ground vibration displacement of saturated and quasi-saturated foundations but the slower attenuation, the larger excess pore pressure in the two types of foundations and faster the attenuation, the greater displacement difference between the quasi-saturated foundation and the saturated once. The vertical vibration displacement and excess static pore pressure of the quasi-saturated foundation decrease with increasing horizontal elastic modulus and vertical once, increasing with increasing horizontal Poisson's ratio, decreasing with increasing vertical Poisson's ratio, decreasing with increasing shear modulus. The vertical elastic modulus has a greater influence on the vertical vibration displacement than horizontal elastic modulus. Compared with the horizontal Poisson's ratio, the vertical once has a greater influence on the vertical vibration displacement peak and excess static pore pressure.

导出引用

高广运1,2，耿建龙1,2，张其唯3，张璐璐1,2，司志鹏4. 2.5维有限元分析高铁荷载下准饱和横观各向同性地基振动特性[J]. 振动与冲击, 2023, 42(15): 298-308

GAO Guangyun1,2, GENG Jianlong1,2, ZHANG Qiwei3, ZHANG Lulu1,2, SI Zhipeng4. 25D finite element analysis for vibration characteristics of quasi-saturated transversely isotropic foundation under high-speed railway load[J]. Journal of Vibration and Shock, 2023, 42(15): 298-308

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