复合地基褥垫层工作性能的混合试验研究  

Hybrid test study of working performance of composite foundation cushion

作　　者：芮瑞[1] 郑晓敏 郑筱彦 谷金林 田子衿 RUI Rui;ZHENG Xiaomin;ZHENG Xiaoyan;GU Jinlin;TIAN Zijin(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;China Railway Construction Group Co.,Ltd.,Beijing 100040,China;China Construction Third Engineering Bureau,Installation Engineering Co.,Ltd.,Wuhan 430075,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]中铁建设集团有限公司,北京100040 [3]中建三局安装工程有限公司,武汉430075

出　　处：《建筑结构》2023年第9期128-132,52,共6页Building Structure

基　　金：国家自然科学基金(51208403,51708438)。

摘　　要：褥垫层是影响复合地基工作性能的关键影响因素。由于研究手段的欠缺,目前对复合地基褥垫层工作性能的认识还有待深入。采用开发的混合试验装置及数据交互系统开展混合试验,建立了褥垫层与上部加载的物理模型与桩土地基数值模型相结合的全组件参与的试验方法,大大缩减了模型试验工作量。利用该试验方法开展了3组不同褥褥垫层厚度的混合试验,分析了复合地基褥垫层的工作性能,揭示了桩土荷载传递规律、沉降规律及桩侧摩阻力的分布。随着褥垫层厚度的增加,桩间土承担的荷载以及桩土相对位移增加;当褥垫层厚度超过200mm时,桩土荷载分担比趋于稳定。Cushion is the key influencing factor to the working performance of composite foundation.Due to the lack of research techniques,the understanding of the working performance of composite foundation cushion needs to be deeply investigated.The hybrid tests was carried out by using the developed hybrid test device and data interaction system,and the whole-component participating test method combining the physical model of the cushion and upper loading with the numerical model of pile-soil foundation was established,which greatly reduced the work of model tests.Using this test method,three groups of hybrid tests with different thickness of cushion were carried out,the working performance of cushion on composite foundation was analyzed,and the mechanism of load transfer,settlement and distribution of friction resistance on pile side were revealed.With the increase of cushion thickness,the load bearing by soil between piles and the relative displacement of piles to soil increased.When the cushion thickness exceeded 200 mm,the pile-soil load bearing ratio tended to be stable.

关 键 词：复合地基 混合试验 工作性能 褥垫层 桩土荷载分担比 

分 类 号：TU443[建筑科学—岩土工程]