论文部分内容阅读
根据土体的Biot固结有限元方程和修正的Burgers蠕变方程,推导土体非线性弹性黏性固结蠕变有限元方程。利用有限元方程对某软黏土地基固结和蠕变耦合问题进行了分析。该软黏土地基竖向和水平向位移随时间的变化规律是:软黏土地基竖向和水平向位移在加载阶段增加较多,在加载结束后很长一段时间内,还有一定的发展,但增加比较平缓,至后期基本上趋于稳定。反映软黏土蠕变作用的影响较明显。随着深度的增加,软黏土地基超静孔隙水压力消散得越来越慢;随着时间的增加,超静孔隙水压力呈下降的趋势,等加载完毕后,超静孔隙水压力慢慢消散,最后基本消散为零。但加载期间超静孔隙水压力消散得慢,加载间歇时间段内超静孔隙水压力消散得快。工程例子表明,土体固结蠕变有限元方程可以用于软黏土地基变形分析,其变形计算结果符合实测情况。
According to the soil Biot consolidation finite element equation and the modified Burgers creep equation, the nonlinear elastic viscous consolidation creep finite element equation of soil is derived. The finite element equation is used to analyze the consolidation and creep coupling problems of a soft clay foundation. The vertical and horizontal displacements of the soft clay foundation with time are as follows: the vertical and horizontal displacements of the soft clay foundation increase more during the loading phase, but there is still a certain development after a long period of loading, Increase relatively flat, basically stabilized to the late. Reflects the effect of creep of soft clay is more obvious. As the depth increases, the excess pore water pressure dissipates more and more slowly on the soft clay foundation. With the increase of time, the pore water pressure of the excessively static pore water tends to decrease. After the loading, the pressure of excess pore water gradually dissipates , Finally dissipated to zero. However, the excess pore water pressure dissipated slowly during loading, and the excess pore water pressure dissipated rapidly during the loading intermittent period. The engineering examples show that the soil consolidation creep finite element equation can be used to analyze the deformation of soft clay foundation. The deformation calculation results are in accordance with the actual situation.