软土地铁盾构隧道垂向随机振动分析模型
发布时间：2019-07-21 20:37
【摘要】：针对我国地铁盾构隧道与长枕埋入式整体道床的常用形式,基于车辆-轨道耦合动力学理论,并通过引入软土动刚度与应变的非线性关系表达式,建立了软土地铁盾构隧道垂向随机振动分析模型,用以研究非线性变化的软土动刚度对地铁盾构隧道随机振动的影响规律。研究结果表明:当软土动刚度随应变频响非线性变化时,盾构隧道随机振动在10Hz以上的中高频段呈下降趋势,与此同时10Hz以下隧道低频振动不降反升,其上升幅度明显高于隧道中高频振动的下降幅度;此外,从地基反力幅频曲线的变化来看,非线性变化的软土动刚度既影响地基反力频域幅值大小,还会导致反力幅值在频域内的重分布,特别是10Hz以下的低频段。
[Abstract]:Aiming at the common forms of shield tunnel and long pillow embedded integral track bed in China, based on the theory of vehicle-track coupling dynamics, and by introducing the nonlinear expression of dynamic stiffness and strain of soft soil, the vertical random vibration analysis model of soft soil iron shield tunnel is established to study the influence of nonlinear dynamic stiffness of soft soil on random vibration of subway shield tunnel. The results show that when the dynamic stiffness of soft soil varies linearly with strain frequency response, the random vibration of shield tunnel decreases in the middle and high frequency band above 10Hz, while the low frequency vibration of tunnel below 10Hz does not decrease but rises, and the amplitude of rise is obviously higher than that of high frequency vibration in tunnel. In addition, from the change of amplitude-frequency curve of foundation reaction force, the nonlinear dynamic stiffness of soft soil not only affects the amplitude of foundation reaction force in frequency domain, but also leads to the redistribution of reaction amplitude in frequency domain, especially in the low frequency section below 10Hz.
【作者单位】： 西南交通大学牵引动力国家重点实验室;南京工业大学交通学院;
【基金】：国家自然科学基金青年科学基金项目(51008257,51008158) 中国博士后科学基金特别资助项目(201104699) 四川省科技支撑计划项目(2011GZ0088)
【分类号】：U455.43;U231
，
本文编号：2517400
[Abstract]:Aiming at the common forms of shield tunnel and long pillow embedded integral track bed in China, based on the theory of vehicle-track coupling dynamics, and by introducing the nonlinear expression of dynamic stiffness and strain of soft soil, the vertical random vibration analysis model of soft soil iron shield tunnel is established to study the influence of nonlinear dynamic stiffness of soft soil on random vibration of subway shield tunnel. The results show that when the dynamic stiffness of soft soil varies linearly with strain frequency response, the random vibration of shield tunnel decreases in the middle and high frequency band above 10Hz, while the low frequency vibration of tunnel below 10Hz does not decrease but rises, and the amplitude of rise is obviously higher than that of high frequency vibration in tunnel. In addition, from the change of amplitude-frequency curve of foundation reaction force, the nonlinear dynamic stiffness of soft soil not only affects the amplitude of foundation reaction force in frequency domain, but also leads to the redistribution of reaction amplitude in frequency domain, especially in the low frequency section below 10Hz.
【作者单位】： 西南交通大学牵引动力国家重点实验室;南京工业大学交通学院;
【基金】：国家自然科学基金青年科学基金项目(51008257,51008158) 中国博士后科学基金特别资助项目(201104699) 四川省科技支撑计划项目(2011GZ0088)
【分类号】：U455.43;U231
，
本文编号：2517400
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