It analyzes the settlement behavior of three types of pile foundation: end-bearing pile, end-bearing friction pile, friction pile based on the settlement data of one passenger dedicated line under construction according to the standard of 350 kilometers per hour. While constructing the main part of bridge, those three kinds pile would settle resulting from the construction load. The settlement of end-bearing pile is little and tends to be stable fast while the one of friction pile is relatively great and tend to be stable slowly. The settlement feature of end-bearing friction pile is between the both. Based on the settlement data, it predicts the settlement tendency of those three kinds of pile. It also researches the requirement of time and the reliability of prediction under the condition of intense duration. It implies some suggestion about the time requirement defined by the standard on the basis of reasonable data. Those conclusions provide some suggestion for the observation and prediction of settlement of high-speed railway.%利用某在建时速350 km客运专线桥梁区段的实测沉降资料,分析根据持力层不同划分的三种桩基端:承桩、端承摩擦桩、摩擦桩的沉降特性.在施工桥梁主体时,三种桩在施工荷栽下均会发生主沉降.承桩总沉降量很小,在主体完工后能迅速沉降稳定;摩擦桩总沉降量较大,沉降趋于稳定速率慢;端承摩擦桩的沉降特点介于上述两种桩之间.在沉降数据的基础上,对不同桩基础类型的预测评估分析、对比了各自特征,探讨在紧张工期下沉降预测评估对时间的要求和预测结果的可靠性.对规范规定的要求时间在合理依据下做出一些建议.这些结果对进行高速铁路客运专线桥梁沉降观测和预测分析有借鉴价值.
展开▼
