EI、Scopus 收录
中文核心期刊

流体饱和多孔介质黏弹性动力人工边界

Viscous-spring dynamical artificial boundary for saturated porous media

  • 摘要: 基于Biot流体饱和多孔介质本构方程,分别考察具有辐射阻尼性质的外行柱面波和球面波在圆柱面和球面人工边界上引起的法向、切向应力的表达式. 在应力表达形式上,固相介质和孔隙流体的法向和切向应力都是由两项组成,它们分别与质点的位移和速度成正比,因此,可在人工边界的法向和切向设置连续分布的并联弹簧------黏滞阻尼器,用来模拟人工边界以外的无限域介质对来自有限计算域的外行波动的能量吸收作用,从而形成了流体饱和多孔介质的黏弹性动力人工边界. 流体饱和多孔介质的黏弹性动力人工边界可方便地与大型通用软件结合,用于分析饱和土中复杂的结构-地基动力相互作用问题. 算例表明流体饱和多孔介质黏弹性动力人工边界具有较好的精度和稳定性.

     

    Abstract: In the dynamic finite element analysis of saturated porous media in unbounded space or half-space, a finite region is usually selected for computing ,so how to deal with the boundries of this finite region is the key procedure for stimulating and analysing the open system. Based on Biot's dynamic theory about saturated porous media,the normal and tangent stress formulaes are deduced for cylindrical waves and spherical waves propagating outward in unbounded saturated porous media.According to the formulaes , the viscous-spring dynamical artificial boundary is developed in this paper on which continuely distributing physical components such as viscous damping or parallel connecting spring and viscous damping are placed on the artificial boundaries to stimulate the affection of unbounded media..The exemples show that the viscous-spring dynamical artificial boundaries have fine accuracy and stability.Key word: saturated porous media, Viscous-spring dynamical artificial boundary, wave motion

     

/

返回文章
返回