摘要
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。
According to the theory of fluid mechanics, considering liquefied soils as fluid, which analyzed the dynamic field by vector symbolic operation method and solved the analytical solution of dynamic field. It is used to analyze hydrodynamic characteristics of liquefied site by finite element method of ABAQUS/CFD; and the numerical solution of the dynamic field is calculated by the basic flow control equation. The results show that underground structure suffers pressure drag caused by surface pressure and frictional resistance caused by shear stress when liquefied soils flow in lateral. The flow velocity of liquefied soils around the tunnel is very small; but there is a velocity strengthening region below the tunnel structure. The analytical solution of the theoretical calculation is greater than the numerical solution of the finite element method; but the distribution of the overall trend is basically the same. The stress field near the tunnel structure is more intensive; and the stress distribution is mainly distributed in head position of liquefied soils.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2016年第S1期557-562,共6页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51408281)
江苏省自然科学基金(No.BK20140108
No.BK20141090)~~
关键词
隧道结构
液化场地
速度场
应力场
tunnel structure
liquefied site
velocity field
stress field
