考虑蠕变的堆载预压软土路基固结度数值分析

摘要

结合某高速公路软土路基处理工程实例,考虑软土蠕变特性,采用有限元软件ABAQUS对堆载预压软土路基固结度进行计算,并与三维固结理论计算及根据实测孔隙水压力推算软基固结度进行对比,对比分析表明：考虑蠕变的模型计算的固结度与根据实测孔隙水压力计算的固结度更加吻合,其准确性更高;考虑蠕变模型进行固结度计算,超静孔隙水压力消散时间受土体蠕变的影响,在后期有增大的趋势,必然延长了软土的固结时间,这更接近工程实际,所以考虑蠕变的数值计算方法简便,结果也更精确。%This paper calculates the consolidation degree by using ABAQUS which consider the characteristics of soft soil creep on the basis of a highway soft soil subgrade project,and calculating consolidation degrees of soft foundation in accordance with three-dimensional consolidation theory and measured pore pressure,and comparison them.The results of comparative analysis as follow that the consolidation degree of considering creep is more consistent with measured pore pressure,which has a higher degree of accuracy,if considering creep,the excess pore water pressure dissipation time become longer and deformation of soft clay foundation will increase accordingly because of soft soil creep,thereby prolonging the time of consolidation.This is actually comply with the project,so the numerical method is more simple,and the results is more accurate.