饱和土体中衬砌隧道在移动荷载下的动力响应

发布时间：2018-03-21 15:30

本文选题：衬砌隧道　切入点：移动点荷载　出处：《浙江大学学报(工学版)》2015年03期 　论文类型：期刊论文

【摘要】：为了研究移动点荷载作用下饱和土体全空间中圆形衬砌隧道的三维动力响应,采用解析方法进行求解.用无限长圆柱壳模拟衬砌,用Biot饱和多孔介质模型模拟土体.引入两类势函数表示土骨架和孔隙水的位移,在不同环向模态下利用修正Bessel方程求解各势函数.结合边界条件,得到频率-波数域内衬砌和土骨架位移、孔隙水压力的解答.对各模态下的解答求和,并进行双重Fourier逆变换得到时间-空间域内的动力响应.通过算例分析荷载速度、土体渗透性等对位移及土体孔压的影响.结果表明:饱和土体中衬砌隧道系统存在临界速度,该速度与土体剪切波波速很接近;位移场和孔压场分布受荷载速度、土体渗透性影响较大;随着土体渗透性增大,土体孔压减小;高速荷载时的位移响应频谱与低速荷载时的差别很大.
[Abstract]:In order to study the effect of three-dimensional dynamic saturated soil under moving point load in full space tunnel response by analytical method. The simulation for lining the infinite cylindrical shell, using Biot to simulate the soil saturated porous media model. We introduce two kinds of displacement potential function representation of soil skeleton and pore water, under different circumferential modes by using the modified Bessel equation of the potential function. Combined with the boundary conditions, get the frequency wavenumber domain lining and soil skeleton displacements, pore water pressure on the answer. The answer of modal summation, and double Fourier inverse transform time - space domain dynamic response. Through the example analysis of load speed, soil influence of permeability of displacement and pore pressure. The results show that there is a critical velocity system of tunnel lining in saturated soil, the speed and shear wave velocity is very close to the displacement field and the pore water pressure distribution; The pore pressure of soil decreases with the increase of soil permeability, and the spectrum of displacement response at high speed is quite different from that of low speed load.

【作者单位】：浙江大学滨海和城市岩土工程研究中心;浙江大学软弱土与环境土工教育部重点实验室;温州大学建筑与土木工程学院;
【基金】：国家杰出青年科学基金资助项目(51025827) 国家自然科学基金青年科学基金资助项目(51108414,51208460) 高等学校博士学科点专项科研基金资助项目(20110101120034,20130101110028)
【分类号】：U451;U455.91

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