考虑固结全过程的实用沉降预测方法  

Practical prediction method for settlement considering whole consolidation process

作　　者：陈凯 姚仰平[1] 朱丙龙 CHEN Kai;YAO Yangping;ZHU Binglong(College of Transportation Science and Engineering,Beihang University,Beijing 100083,China;China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100083 [2]中国铁道科学研究院集团有限公司,北京100081

出　　处：《岩土工程学报》2024年第S02期103-106,共4页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(52238007,12472401)。

摘　　要：中国大量交通基础设施修筑在软土地基上,建立能够适用深厚软土地基的沉降预测方法具有重要意义。在实际监测过程中,深厚软土的主固结时间漫长,实测数据包含了主固结变形与蠕变变形。大多数沉降预测模型基于瞬时加载,没有考虑非线性的固结全过程。考虑固结变形全过程,采用新的曲线表达式反映一维固结曲线在不同阶段的非线性,将瞬时变形和延时变形均按非线性处理,建立考虑固结全过程的实用沉降预测方法。以常用的3种曲线拟合方法作为参照对象,根据大阪关西国际机场的监测数据进行曲线拟合与预测对比。结果表明,扩展蠕变沉降算法能够更准确、更可靠地预测软土地基的沉降。The construction of transportation infrastructure above soft soil foundation is prevalent in China,making it imperative to establish a prediction method for settlement applicable to deep soft soil foundations.During field monitoring processes,the primary consolidation deformation and creep deformation are both observed as the main consolidation of deep soft soils takes considerable time.Most prediction models for settlement are based on instantaneous loading and do not consider the whole process of nonlinear consolidation.This study considers the whole process of consolidation deformation and introduces a novel curve expression to account for the nonlinearity in one-dimensional consolidation curves at different stages.Both the instantaneous deformation and delayed deformation are treated as nonlinearities,resulting in an extended creep settlement algorithm that offers a practical approach considering the whole consolidation process.To validate its effectiveness,the curve fitting and prediction comparisons are conducted using the monitoring data from the Osaka Kansai International Airport against three commonly used curve fitting methods as the reference benchmarks.The results demonstrate that the extended creep settlement algorithm provides more accurate and reliable predictions for settlements in soft soil foundations.

关 键 词：沉降预测 固结 蠕变 软土 

分 类 号：TU432[建筑科学—岩土工程]