软基路堤沉降历程预报的改进方法

Improvement of Settlement Prediction for the Embankment on Soft Soil

传统的沉降历程预报公式是按附加总应力为常数来制定的，因此无法考虑施工期间附加总应力的不断变化。本文采用分段函数表示沉降历程预报公式，可以考虑在施工期间按线性增长，在运营期为基本恒定的附加总应力这一较普遍的情况。这一改进方法在京津塘高速公路软基试验工程中得到验证，和传统方法比较更接近于实测沉降，使早期和中期沉降的计算精度都有所改善。

As in fact the total stress is variable during construction,a new method is developed in this paper to suit the common case in which the total stress is linearly increased inconstruction period and is constant in operation period. This new method has been apppliedsuccsessfully to the soft soil test field of Beijing-Tianjing-Tanggu freeway to replace the conventional method in which the total stress is kept constant. The settlements predicted by thenew method are closer to the measured value than by the conventional one,especially in ear-ly and middle stages of settlement.