摘要
为了分析沥青混凝土路面在循环车辆荷载作用下的孔隙水压力反应,针对饱水情况,利用变温粘弹性理论和Biot动力固结理论,由Galerkin加权余量法,形成以节点位移及节点孔隙水压力为状态参数的有效应力有限元格式;并选取常用的双圆荷载计算模型,对饱水沥青路面孔隙水压力的空间和时间分布进行计算。计算结果表明:有效应力及孔隙水压力均与外荷载具有相似的波形,只是在不同空间位置出现不同的峰值大小和相位滞后。通过分析可以得出:渗透系数和加载速率是影响孔隙水压力峰值的2个关键参数,它们对后者具有负指数影响效果。
In order to analyze dynamical response of pore water pressure in asphalt concrete pavement under the cyclical vehicle load, a dynamic finite element method （FEM） was derived by Galerkin weighted residual method based on Biot＇s consolidation theory and viscoelastic incremental constitutive equations, whose variable parameter was given including displacement as well as water pressure. Furthermore, an instance of double disk load model was adopted to numerate the spatial and time distribution of pore water pressure. As a result, effective stress and pore water pressure show the same waveform as the cyclical load, except their different peak values and lagged phases in different locations. So, it can be proved with these results that permeability coefficient and loading speed are two key parameters to influence the maximal pore water pressure, and they all work with the rule of negative exponent.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第5期1100-1104,共5页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(50578031)
关键词
沥青路面
动水压力
有限元
Biot动力固结理论
asphalt concrete pavement
dynamical pore water pressure
finite element method
Biot＇s consolidation theory
