一个预测路堤沉降的新经验公式模型

大量工程实践验证表明，无论是一级荷载还是多级荷载下的指数曲线模型，均可对地基沉降进行较好地预测，但也存在不足之处。先基于绝对时间坐标系下的软土次压缩计算修正式子，提出耦合软土流变项的新型指数曲线模型，并采用数学中最优化技术，根据前期沉降实测资料对模型中参数进行反演。实例计算表明：该模型对沉降预测精度高，能较合理地反应出土颗粒骨架的蠕变过程，且能给出不同时刻的次压缩量，在实际工程上具有一定的参考价值。

A NEW EMPIRICAL FORMULA MODEL FOR SETTLEMENT PREDICTION OF EMBANKMENTS

Lots of engineering examples show that the exponential curve models,for either single-stage loading or multi-stage loadings,can well predict foundation settlement,but they have shortcomings. A new type of exponential curve model,coupled with rheological term for soft soils,is put forward based on the calculation formula of modified secondary compression under absolute time coordinates. The parameters are back-analyzed with the optimization technology according to the measured settlements. It is proved that the new model holds higher prediction accuracy and can reasonably reflect the creep course of soil framework. Hence,it has referential value to practical engineering.