摘要
引入双屈服面弹塑性本构模型,将土骨架的变位和孔隙水作为变量进行流、固耦合分析,通过瞬态波动有限元程序模拟冲击荷载作用下层状地基土体的动态响应特征。计算结果表明,土体的应力峰值、孔压峰值和位移峰值随土层深度和距锤底中心的径向距离的增大而逐渐滞后,通过不同位置土体的动态响应分析,表明应力波是以竖向的椭球面形状在土体中传播的,而且衰减很快。数值计算结果与现场测试结果两者之间较为吻合,为实现有限元模拟分析现场实际提供了可靠的依据。
The double yield surface elastic-plasticity constitutive model and the loading-unloading criterion are considered in this paper. The deformation of soil skeleton and the pore water pressure are also analyzed as the coupling variable. The procedure of single-point and single-time impacting is simulated by using the finite dynamic element program DCFEM which is suited to stratified soft soil foundation, The results of calculation show that the peak stress, peak pore water pressure and peak deformation are delay with the increasing of depth and radial distance to center of the hammer bottom. The stress wave transmits in ground according to erect elliptical spherical surface; and its attenuation is very quick. The consistency between the computation results and the data measured in-situ is obtained. The effective means simulating in-situ project of soft clay foundation which was treated by dynamic consolidation and drainage method is provided.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2006年第1期23-28,共6页
Rock and Soil Mechanics
基金
湖北省自然科学基金(No.2004ABA024)
中国科学院武汉岩土力学研究所博士科研启动基金资助项目(No.Q220302)
关键词
强夯法
动态有限元法
孔压
应力
变形
dynamic consolidation
finite dynamic element method
pore water pressure
stress
displacement
作者简介
孟庆山，男，1974年生，博士，主要从事岩土力学计算和软基加固处理研究。E-mail：mqs749720@yahoo．com．cn
