拱形与直线形双排桩支护结构变形特性离心模型试验对比  

Research on Centrifugal Model Test of Different Arrangement of Double-row Piles Retaining Structures

作　　者：廖志坚 吕琦 吴越 LIAO Zhijian;Lü Qi;WU Yue(Shanghai Geological Engineering Exploration(Group)Co.,Ltd,Shanghai 200072,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]上海市地矿工程勘察(集团)有限公司,上海200072 [2]同济大学地下建筑与工程系,上海200092

出　　处：《结构工程师》2022年第6期111-118,共8页Structural Engineers

基　　金：上海市地矿工程勘察院资助项目。

摘　　要：拱形双排桩支护结构利用了拱形的受力特性,将其受到的外部荷载转化为自身轴力,充分发挥了混凝土材料的抗压性能,在工程实践中得到了应用。但其受力变形规律较为复杂,国内外的相关研究滞后于工程实践的需求。以某实际基坑工程为背景,采用离心模型试验对比研究了直线和拱形双排桩支护结构的受力变形特性。试验结果表明:两者在桩身弯矩规律、水平变形规律和桩后土体沉降规律上基本一致,但拱形双排桩支护结构更有利于基坑的变形控制,在基坑中心处双排桩的最大弯矩值和水平变形均大于拱脚处的双排桩。研究成果可为类似工程设计及理论研究提供试验参考。Due to its unique mechanical characteristics, the arched double-row pile supporting structure can convert the external load it receives into its own axial force, thereby giving full play to the compressive performance of concrete materials. This new type of supporting system is gradually being promoted and applied in engineering practice. However, the mechanism of arched double-row piles is much complicated, and the relevant researches are lags far behind engineering practice. Based on the actual foundation pit engineering, the centrifugal model test is used to compare the force and deformation laws of the straight and arched doublerow piles retaining structures. The test results show that the two are more consistent in the law of bending moment of the pile, the law of horizontal deformation and the law of settlement of the soil behind the pile, but the arched double-row piles retaining structures are more conducive to the deformation control of the foundation pit;The maximum positive and negative bending moment and horizontal deformation of the doublerow piles at the center are larger than those of the double-row piles at the arch foot. The results can provide experimental reference for similar engineering design and theoretical research.

关 键 词：离心模型试验 双排桩 拱形双排桩 支护结构 

分 类 号：TU473.1[建筑科学—结构工程]