摘要
Asaoka法是以土体固结系数保持不变为前提推导而来,而工程中压缩模量和渗透系数的改变会引起固结系数的变化。借助ABAQUS软件,研究预压时效和渗透系数变化对Asaoka法预测精度的影响,分析一般性粘土和软土在常规渗透系数和变渗透系数下预压时效对Asaoka法预测最终沉降的影响。结果表明:预压期越长,Asaoka法推算的最终沉降量越大,相对误差越小;变渗透系数下相同预压时间的Asaoka法预测精度明显小于常规渗透系数下的预测精度,其中以软土的差别最大;Asaoka法运用于渗透系数较小的软土中在较长的预压期内预测精度较高。
Asaoka’s method is based on the theory that the consolidation coefficient of soil keeps constant ,but in fact , the changes of compression modulus and the permeability coefficient can cause the change of consolidation coefficient .For studying the influence of preloading time-effect and variable permeability coefficient in the prediction of Asaoka ’s method by using ABAQUS software ,the influence of preloading time-effect of clay and soft soil on the settlement magnitude by using Asaoka’s method was analyzed in the case of constant permeability coefficient and variable permeability coefficient . The results show that the final settlement magnitude by using Asaoka ’ s method is large and the relative error is small when the preloading time is long .The prediction accuracy is significantly small in the case of variable permeability coeffi-cient ,especially in the soft soil .It needs longer preloading time when using Asaoka ’s method in the soft soil with small permeability coefficient so as to achieve the higher prediction accuracy .
出处
《水利与建筑工程学报》
2014年第1期67-71,111,共6页
Journal of Water Resources and Architectural Engineering
基金
教育部新教师基金(20110094120002)
广东省交通运输厅科技项目(科技-2013-02-023)
关键词
ASAOKA法
预压时效
软土地基
渗透系数变化
Asaoka’s method
preloading time effect
soft soil foundation
change of permeability coefficient
