摘要
采用上覆弹性层饱和地基土模型描述水位于地表以下的地基动力响应问题,利用改变弹性层厚度模拟土体中水位的变化。基于Biot饱和多孔介质动力方程和层间连续性条件,求解出上覆弹性层饱和半空间频域波数内位移场表达式,通过Fourier逆变换得到3维空间域的结果,研究了水位变化对于土体动力响应的影响。数值计算结果表明,水位的变化会对地基中波的传播产生一定影响。当水位离地面较深时,地面竖向位移值与弹性半空间情况类似;随着水位上升,弹性层和饱和半空间界面上的反射波会对地面竖向位移产生影响,导致地表位移值较弹性半空间下的结果有所增大,当水位接近地表时,位移值变化类似于饱和地基土。
Here,a saturated foundation soil model with an overlying elastic layer was used to describe dynamic response of foundation with water located below surface,and water level change in soil body was simulated by changing thickness of elastic layer.Based on Biot saturated porous medium dynamic equation and interlayer continuity conditions,the displacement field expression in frequency domain wavenumber of saturated half space of overlying elastic layer was solved,and the results in 3D space domain were obtained through inverse Fourier transform.Effects of water level change on dynamic response of soil body were studied.Numerical calculation results showed that change of water level can have a certain impact on propagation of waves in foundation;when water level is deeper from ground,vertical displacement values of ground are similar to those in elastic half space situation;with increase in water level,reflected waves on interface between elastic layer and saturated half space can have an impact on vertical displacements of ground to cause increase in surface displacement values compared to the results under elastic half space;when water level approaches ground surface,displacement value changes are similar to those of saturated foundation soil.
作者
姚锦宝
董隆华
YAO Jinbao;DONG Longhua(Key Laboratory of Technoloigy on Intelligent Transportation Sysetms,Mininstry of Transport,Beijing 100088,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第21期272-277,共6页
Journal of Vibration and Shock
基金
智能交通技术交通运输行业重点实验室开放课题。
关键词
水位变化
饱和土
移动荷载
动力响应
water level change
saturated soil
moving load
dynamic response
