列车运行引起的CFG桩复合路基动力响应分析

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (24) : 135-143.

论文

高广运1,2，李绍毅1,2

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Dynamic response of CFG pile composite subgrade induced by moving train loadings

GAO Guanyun1,2，LI Shaoyi1,2

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文章历史 +

摘要

结合上部列车-轨道模型与下部有限元路基模型，建立了列车-轨道-路基整体动力分析模型，分析了CFG复合路基对地面振动的影响。列车采用多质点弹簧-阻尼器模拟，钢轨采用欧拉梁模拟并考虑了钢轨随机不平顺影响，列车-轨道体系采用振型分解法求解；铁路路基经有限元离散后采用2.5维有限元方法求解，采用粘滞阻尼吸波边界减小边界反射，CFG桩采用等代模量桩墙模拟。分析了CFG桩复合路基对地面振动衰减和振动频谱的影响。结果表明：CFG桩复合路基对地面振动的影响分为CFG桩体的影响和垫层影响；CFG桩体对路基中的高频振动有波导作用，可减小远离路堤的高频振动；复合路基垫层可降低中低频振动。CFG复合路基减小了路堤边缘的高频振动，提高了路堤边坡的动力稳定性。

Abstract

The train-track-subgrade numerical model is established including the upper train-track model and the under subgrade FE model to analyze the ground vibration of the CFG pile composite subgrade. The train is simulated by the multiple mass-spring-damper model. The track is modeled by Euler beam with consideration of random rail irregularities. The train-track model is solved by the modal analysis method. The railway subgrade is discretized and solved by 2.5D FEM with a viscous damping absorbing boundary to reduce the reflection wave. The CFG pile is modeled by pile wall with modified elastic modulus. The influences of the CFG pile composite subgrade on ground vibration attenuation and vibration frequency spectrum are discussed. The results show that The influence of CFG pile composite subgrade on the ground vibration is comprised of the influence of CFG pile and the influence of cushion. The CFG pile has the waveguide effect on the high frequency vibration and reduces the high frequency vibration from the embankment; the cushion of the composite subgrade affects the ground vibration by reducing the low and medium frequency vibration. Besides the composite subgrade reduces the high frequency vibration at the edge of embankment, that improves the dynamic stability of the slope of embankment.

导出引用

高广运1,2，李绍毅1,2. 列车运行引起的CFG桩复合路基动力响应分析[J]. 振动与冲击, 2015, 34(24): 135-143

GAO Guanyun1,2，LI Shaoyi1,2 . Dynamic response of CFG pile composite subgrade induced by moving train loadings[J]. Journal of Vibration and Shock, 2015, 34(24): 135-143

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