摘要
增长曲线模型自身的特点决定了其能很好地预测地基沉降的发展趋势。先将该模型推广到多级填土荷载下的路堤沉降预测中,接着基于绝对时间坐标系下的软土次压缩计算式,提出了带软土流变项的新型增长曲线模型,并采用数学中的最优化技术,结合前期沉降实测资料对模型中待定参数进行反演。实例计算表明:该模型对沉降预测精度高,能合理地反映出土颗粒骨架的蠕变过程,且能较准确地给出不同时刻的次压缩量,具有一定的工程参考价值。
The logistic model can well predict the developing trend of foundation settlement with its own virtues. Firstly, it is extended to settlement predication of embankment subjected to multistage loadings due to filled soil, and then one new type logistic model coupled with theological term of soft soil is put forward based on the secondary compression calculation formula under the absolute time coordinates. The relevant parameters are back-analyzed with the optimizing technology of mathematics according to filed measured settlements. It is seen that this new model has higher predicted accuracy and can reasonably reflect the creeping course of soft soil grain skeleton. Besides, the quantity of secondary compression at different times can also be accurately given. The results obtained in this paper may be useful in engineering.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2006年第9期1567-1570,共4页
Rock and Soil Mechanics
关键词
软土
流变特性
沉降预测
增长曲线模型
0.618法
soft soil
rheological property
settlement prediction
logistic model
0.618 method
