基坑斜-直交替支护桩工作机理分析

郑刚; 何晓佩; 周海祚; 王恩钰; 杨石飞; 魏建华

doi:10.11779/CJGE2019S1025

基坑斜-直交替支护桩工作机理分析 English Version

郑刚^{1, 2},
何晓佩^{1, 2},
周海祚^1,2, ,,
王恩钰^{1, 2},
杨石飞³,
魏建华³

1. 天津大学滨海土木工程结构与安全教育部重点实验室,天津 300072;
2. 天津大学土木工程系,天津 300072;
3. 上海勘察设计研究院（集团）有限公司,天津 300072

基金项目: 国家自然科学基金项目（51708405; 41630641）; 国家重点研发计划（2017YFC0805407）; 天津市科技计划项目（16YDLJSF00040）

详细信息

作者简介:
郑刚(1967—),男,博士,教授,博士生导师,从事土力学及岩土工程教学与科研工作。E-mail:zhenggang1967@163.com。

通讯作者:
周海祚，E-mail：zhzrobby@163.com

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出版历程
- 收稿日期: 2019-04-29
- 发布日期: 2019-07-14

Working mechanism of inclined-vertical retaining piles in excavations

ZHENG Gang^{1, 2},
HE Xiao-pei^{1, 2},
ZHOU Hai-zuo^1,2, ,,
WANG En-yu^{1, 2},
YANG Shi-fei³,
WEI Jian-hua³

1. Key Laboratory of Coast Civil Structure Safety (Tianjin University), Ministry of Education, Tianjin 300072, China;
2. School of CivilEngineering, Tianjin University, Tianjin 300072, China;
3. SGIDI Engineering Consulting (Group) Co., Ltd., Tianjin 300072, China

摘要

摘要: 在基坑工程中,可将部分竖直悬臂支护桩倾斜一定角度后形成倾斜桩,利用冠梁连接交替布置的竖直悬臂桩与倾斜桩可形成基坑斜-直交替支护体系。已有工程实测表明,基坑斜-直交替支护桩具备良好的抗倾覆和变形控制能力;然而,目前尚缺乏对其工作机理的认识。提出了基坑斜-直交替支护桩的3个工作机理效应,即：刚架效应、斜撑效应和重力效应。以支护结构变形和坑外土体沉降为评价标准,对3项效应进行分析。结果表明：①由于冠梁的连接作用,斜桩与直桩形成一个整体刚架体系,可有效减小桩身和土体变形;②斜桩侧壁摩擦是斜桩对直桩支撑力发挥的关键因素,若斜桩侧壁光滑,基坑斜-直交替支护桩的支护能力与悬臂直桩几乎相同;③斜直桩桩间土与支护体系形成一个整体,可一定程度提高支护体系抵抗基坑变形的能力。
- 斜-直交替支护桩 /
- 机理分析 /
- 刚架效应 /
- 斜撑效应 /
- 重力效应
Abstract: In excavation engineering, an inclined-vertical retaining pile system can be formed by connecting the cantilever piles and the inclined piles. The previous case histories indicate that the inclined-vertical retaining piles have the advantage in overturning resistance and deformation control. However, the insight into the working mechanism of inclined-vertical retaining piles is limited. Three mechanisms are proposed in this investigation, that is, frame effect, supporting effect, and gravity effect. Taking the deformation of retaining structures and the ground settlement as the criteria, the contribution of these work mechanisms is analyzed. The results indicate that (1) The formed frame system can significantly decrease the structural deformation and ground settlement. (2) the side friction in inclined piles is vital to the supporting effect on the cantilever piles. (3) the soil between the inclined and vertical piles has a limited effect on the structural deformation.
- inclined-vertical pile /
- mechanism analysis /
- frame effect /
- supporting effect /
- gravity effect

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参考文献(11)

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