箱型框架桥顶进工作基坑的变形预测

既有铁路或公路下箱型框架顶进工作基坑的稳定性问题,具有不同于一般基坑的显著特征。依据变形预测理论,根据既有铁路下箱型框架顶进施工工作基坑的变形特征,建立了箱型框架桥顶进施工工作基坑的变形预测模型和方法。某既有铁路下箱型框架顶进工作基坑围护结构顶部与周边地下管线沉降和围护结构侧向水平位移的预测结果表明,所建立的箱型框架桥顶进工作基坑预测方法具有良好的预测效果,具有利用时间序列中的前一区间中的数据精确地预测随后区间的变形、并能及时地将预测进行修正的特点,可为类似于箱型框架桥顶进工作基坑这类施工工况特殊、周边环境复杂、变形量大且变形变化迅速的基坑施工提供即时预测。

Deformation Predication of Deep Foundation Ditch Used in the Jacking Construction of Box Frame Bridge

The stability of the deep foundation ditch used in the jacking construction of box frame structure for railways or highway is different from others. According to the deformation predication theory and on the basis of the deformation characteristics of the said foundation ditch the deformation predication model and method on the foundation ditch are established. The prediction results for the settlement of the top bracing structure and the surrounding underground pipelines and the lateral displacement at different deep position of the structure show that the method has the favorable predication effect and the feature of the precisely-predicating deformation at the behind section by means of the data from the front section in the time array, and the prediction could be duly modified, which could give the instant prediction for the similar construction with the particular construction states, the complicated surrounding environment and the fast-changing deformation.