(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)

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.

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

中图分类号:TU443 文献标志码:A 文章编号:1002-848X(2023)09-0128-05

DOI:10. 19701 / j. jzjg. 20211309

Hybrid test study of working performance of composite foundation cushion

RUI Rui1, ZHENG Xiaomin1, ZHENG Xiaoyan2, GU Jinlin3, TIAN Zijin1

(1 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;2 China Railway Construction Group Co. , Ltd. , Beijing 100040, China; 3 China ConstructionThird Engineering Bureau, Installation Engineering Co. , Ltd. , Wuhan 430075, China)

Abstract: Cushion is the key influencing factor to the working performance of composite foundation. Due to the lack ofresearch techniques, the understanding of the working performance of composite foundation cushion needs to be deeplyinvestigated. The hybrid tests was carried out by using the developed hybrid test device and data interaction system, andthe whole-component participating test method combining the physical model of the cushion and upper loading with thenumerical model of pile-soil foundation was established, which greatly reduced the work of model tests. Using this testmethod, three groups of hybrid tests with different thickness of cushion were carried out, the working performance ofcushion on composite foundation was analyzed, and the mechanism of load transfer, settlement and distribution of frictionresistance on pile side were revealed. With the increase of cushion thickness, the load bearing by soil between piles and therelative displacement of piles to soil increased. When the cushion thickness exceeded 200 mm, the pile-soil load bearingratio tended to be stable.

Keywords:composite foundation; hybrid test; working performance; cushion; pile-soil load bearing ratio

∗国家自然科学基金(51208403,51708438).

第一作者:芮瑞,教授,博士,博士生导师,主要从事地基处理、岩土工程加固技术方面的研究与教学工作,Email: r. rui@ whut.edu. cn.

[引用本文] 芮瑞,郑晓敏,郑筱彦,等. 复合地基褥垫层工作性能的混合试验研究[ J]. 建筑结构,2023,53(9):128-132,52. RUI Rui,ZHENG Xiaomin,ZHENG Xiaoyan,et al. Hybrid test study of working performance of compositefoundation cushion[J]. Building Structure,2023,53(9):128-132,52.