基坑支撑轴力时空变化规律及其预测模型  

Spatiotemporal Variation and Prediction Model of Supporting Axial Force in Foundation Pit

作　　者：张鹏 毛徐飞 于洋[2] 石博 陈欣蔚 薛博阳 Zhang Peng;Mao Xufei;Yu Yang;Shi Bo;Chen Xinwei;Xue Boyang(Beijing Municipal Road&Bridge Group Co.,Ltd.,Beijing 100088,China;Ocean College,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]北京市政路桥股份有限公司,北京100088 [2]浙江大学海洋学院,浙江舟山316021

出　　处：《市政技术》2023年第1期66-71,77,共7页Journal of Municipal Technology

摘　　要：支撑是基坑支护结构的重要组成部分,合理地计算支撑轴力不仅有利于提高支护结构的经济性,还便于实时评估基坑开挖过程中支撑的安全性能。因此,详细介绍了绍兴市地铁1号线阳和路站基坑支撑轴力监测布置,分析了基坑开挖过程中支撑轴力演变与空间分布规律,探讨了现有支撑轴力计算模型在该工程中的适用性。研究发现,每层钢支撑的作用会使首层混凝土支撑轴力降低;支撑水平间距和刚度越大,其承担的轴力就越大;支撑轴力分布的不均匀性主要由地层分布的不均匀性引起;用一些学者提出的粗粒土模型以及硬黏土上限模型能很好地预测该工程钢支撑的最大轴力。该研究成果可为分层软土基坑支撑轴力的计算和预测提供参考。Brace is an important part of foundation pit. Reasonable calculation of brace axial force is not only conducive to improve economy of the brace structure, but also convenient for real-time evaluation of brace safety during the process of foundation pit excavation. Therefore, the monitoring layout of the brace axial force of Yanghe Road Station of Shaoxing Metro Line 1 is introduced in detail, the evolution and spatial distribution of the brace axial force and discuss is analyzedthe applicability of the existing calculation model of the brace axial force. It is found that each layer of steel brace will reduce the brace axial force at the first layer of concrete brace;The greater the horizontal spacing and stiffness of the support, the greater the axial force;The uneven distribution of the brace axial force is mainly caused by the uneven distribution of the stratum;The maximum axial force of the steel brace can be well predicted by the coarse-grained soil model and the upper limit model of hard clay. The research results provide a reference for the calculation and prediction of the axial force of the foundation pit brace in layered soft soil.

关 键 词：软土 基坑 支撑 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]