桥台背路基沉降理论计算

根据台背路堤分层施工的实际情况，提出台背路基沉降计算理论和计算模型，该理论将路堤填土根据施工进度划分为数层，由于充分考虑了每层填土对地基的不同作用时间，计算模型更加符合施工进程。利用该理论，推导了梯形分布条形荷载作用下土中任意点处应力的计算公式。为验证理论计算的实用性，以广东惠州西林河大桥龙门台背路基沉降为例，将实测结果与计算结果进行了比较分析。结果表明：实测值与理论计算值具有很好的相关性；台背路基填筑时，压实度控制得越好，理论计算沉降与实际沉降就吻合得越好。

Calculating theory of settlement of bridge approach embankment

Based on an actual stratified embankment behind the bridge abutment, this paper puts forward the calculating theory and model for the settlement of subgrade. This theory stratifies the fill into several layers according to the construction progress. In this model, the affect of different layers on the subgrade at different time is taken into account, so this calculating model is good in accordance with construction procedure. With this theory, this paper deduces the formula to calculate the stress at any point of the earth under the trapezoidal distribution strip load. In order to verify the practicability of this theory, the back-abutment fill settlement of Xilin river bridge in Huizhou City is selected as the calculating case. By comparing the calculated value with the actual measured value, it shows great correlation between them. And it is also confirmed that the better the subgrade is compacted, the better the calculated value meet the actual measured value. 2 tabs; 5 figs; 7 refs.