桩承式土工袋垫层加筋地基二维模型试验  

2D model tests on pile supported foundation reinforced with soilbags cushion

作　　者：刘斯宏[1] 韩雪蕾 李博文 鲁洋[1] LIU Sihong;HAN Xuelei;LI Bowen;LU Yang(School of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,南京210098

出　　处：《东南大学学报(自然科学版)》2025年第1期117-123,共7页Journal of Southeast University:Natural Science Edition

基　　金：国家自然科学基金资助项目(52479099,52109123);国家重点研发计划资助项目(2017YFE0128900)。

摘　　要：在地基加固中,土工袋与桩基础均可起到提高地基承载力,减小不均匀沉降的作用,但将两者联合用于地基处理缺乏深入研究。设计了可模拟桩承式地基差异性沉降的试验装置,开展了一系列二维模型试验。通过数字图像相关技术(DIC)获取了模型地基位移场,利用称重传感器精确地测量了地基荷载变化,分析了土工袋垫层厚度、桩顶埋深、桩间距和地基表面荷载对地基变形模式及荷载传递规律的影响。结果表明:桩顶土工袋可扩大桩体作用范围,土工袋长度与桩宽的较优比例为2∶1;相较于桩承式地基,土工袋垫层可起到协调地基内部变形的作用;土工袋垫层厚度及桩顶埋深的增加对减小地基表面不均匀沉降有利;在地基表面施加荷载的过程中,土工袋垫层可使更多荷载传递至桩顶。Both soilbags and pile foundations are applied to reinforce the foundation with improving bearing capacity and reducing uneven settlement.However,seldom studies are made on soilbags cushion in combina-tion with piles for treating foundation.A testing apparatus that could simulate differential settlement of pile-supported foundation was developed.A series of two-dimensional model tests were conducted on the model foundation to investigate the influencing factors of the thickness of soilbags cushion,the embedded depth of the pile top and the pile spacing as well as the surface pressure on the deformation patterns and load transfer law.The digital image correlation(DIC)technology was adopted to achieve the displacement field and load cells were used to measure the load variations of the model foundation.The test results show that the soilbag on the pile top acts equivalently as the expansion of effective range of the pile,and the relative optimum ratio of the length of the soilbag on the pile top to the pile width is 2∶1.Compared with pile-supported foundation,the soilbags cushion shows better deformation coordination performance in the foundation.The increase of soilbags cushion thickness and the embedded depth of the pile top are beneficial to reduce the differential settle-ment near the foundation surface.Most of the upper load is transferred to piles through the soilbags cushion during the process of applying pressure on the surface of the foundation.

关 键 词：土工袋垫层 模型试验 变形模式 荷载传递 

分 类 号：TU472[建筑科学—结构工程]