地下工程开挖卸荷既有桩基承载响应物理模拟及新进展

刘松玉; 李洪江; 童立元; 张明飞; 周志宏

doi:10.11779/CJGE201907018

地下工程开挖卸荷既有桩基承载响应物理模拟及新进展 English Version

1. 东南大学岩土工程研究所,江苏南京 210096;
2. 郑州航空工业管理学院土木建筑工程学院,河南郑州450046;
3. 江苏省建设工程设计施工图审核中心,江苏南京 210036

基金项目: 国家重点研发计划项目（2016YFC0800201）; 江苏省建设系统科技项目（2014ZD66）; 国家自然科学基金项目（51578146,51878157）; 江苏省自然科学基金项目（BK20181282）.

详细信息

作者简介:
刘松玉(1963— ),男,江苏靖江人,教授,博士生导师,主要从事土力学与岩土工程教学与科研工作。E-mail: liusy@seu.edu.cn。

通讯作者:
李洪江，E-mail：lihongjiang55@126.com

中图分类号: TU473
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出版历程
- 收稿日期: 2018-07-11
- 发布日期: 2019-07-24

Model tests and new progress of pile response due to underground excavations

1. Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China;
2. Civil Engineering and Architecture Institute, Zhengzhou University of Aeronautics, Zhengzhou 450046, China;
3. Jiangsu Provincial Construction Drawing Examination & Verification Center, Nanjing 210036, China

摘要

摘要: 地下工程开挖卸荷引起的灾变问题一直是社会高度关注的问题之一,近年来中国多地发生了由基坑开挖或隧道建设诱发的地面变形、桩基倾斜偏位及建筑物垮塌等灾害事故,威胁人们的生命和财产安全。简要介绍传统地下工程开挖卸荷物理模拟存在的不足,对比概述了近20 a间国内外有关基坑、隧道开挖对桩基影响的典型试验方法和试验装置（小比尺模型试验和离心机试验）。重点设计提出了一种地下工程开挖卸荷既有桩基承载响应室内综合模拟试验装置,并对模型设计原理及技术特点进行了分析,同时开展了邻近基坑开挖对既有工程桩水平承载力影响及工程阻隔物对地下水阻挡作用影响两类问题试验研究。最后,对卸荷桩未来的研究方向提出了一些建议和展望。
- 地下工程开挖 /
- 桩基 /
- 模型试验 /
- 气压加载 /
- 卸荷桩
Abstract: The disaster from the unloading effects induced by underground excavations has always been one of the high-concern issues. In recent years, a series of ground deformation, pile foundation tilt, or building collapse cases have taken place in China, and sometimes they even threaten people's lives and property. The imperfection of the conventional model tests for simulating underground excavations is introduced, and the typical experimental test methods and test devices including small-scale and centrifuge models corresponding to excavation of foundation pit and tunneling in the past two decades are briefly compared. In this study, a new testing apparatus for pile load response undergoing underground excavations is proposed, and its design principles and technical characteristics are analyzed. Using the test boxes, the studies on the lateral pile response to adjacent excavation and the blocking effect of a barrier on the flow of groundwater are conducted. Finally, some suggestions and prospects about the future study on unloading piles are put forward.
- underground excavation /
- pile foundation /
- model test /
- pneumatic loading /
- unloading pile

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