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将液化流动的土体视为流体,运用流体力学原理,基于矢量符号运算法进行液化场地的动力场分析,求解出动力场解析解。采用ABAQUS/CFD进行液化场地流体动力学有限元分析,根据流动基本控制方程,计算出动力场的数值解。分析结果表明,液化土体横向流动时,隧道结构周围的应力场既包括由表面压力引起的压力阻力,也包括由剪应力引起的摩擦阻力;隧道结构周围的液化土体流动速度很小,但在隧道结构下方存在流动速度加强区;理论计算的动力场解析解大于有限元计算的数值解,但总体的分布变化趋势基本一致;隧道结构附近的应力场变化较为密集,所受到的应力主要分布在液化土体流动的迎面位置。
The liquefied soil is regarded as fluid. The fluid mechanics principle is used to analyze the dynamic field of the liquefied site based on the vector symbol method. The analytical solution of the dynamic field is obtained. The ABAQUS / CFD hydrodynamic finite element analysis of the liquefied site was used. According to the basic flow control equation, the numerical solution of the dynamic field was calculated. The results show that the stress field around the tunnel structure includes both the pressure resistance caused by the surface pressure and the frictional resistance caused by the shear stress when the liquefied soil flows laterally. The flow velocity of the liquefied soil around the tunnel structure is very small, Under the tunnel structure, the flow velocity enhancement zone exists. The analytical solution of the theoretical dynamic field is larger than the numerical solution of the finite element calculation. However, the overall trend of the distribution changes is basically the same. The stress field near the tunnel structure changes more intensively and the stress is mainly distributed Liquefied soil in the flow of the oncoming position.