降雨影响下残积土层中深基坑变形特性测试及分析

doi:10.16183/j.cnki.jsjtu.2019.012

上海交通大学学报 ›› 2020, Vol. 54 ›› Issue (8): 873-880.doi: 10.16183/j.cnki.jsjtu.2019.012

• • 上一篇

降雨影响下残积土层中深基坑变形特性测试及分析

肖朝昀¹, 李明广²(), 王大发², 陈锦剑²

1.华侨大学土木工程学院, 福建厦门 361021
2.上海交通大学土木工程系, 上海 200240

收稿日期:2019-01-08 出版日期:2020-08-28 发布日期:2020-08-18
通讯作者: 李明广 E-mail:lmg20066028@sjtu.edu.cn
作者简介:肖朝昀(1979-),男,江西省吉安市人,教授,主要从事地下工程方面的研究
基金资助:
国家自然科学基金面上项目(41977216);上海市青年科技启明星项目(19QC1400800);福建省交通运输科技发展项目(201627)

Test and Analysis of Deformation Characteristics of Deep Foundation Pit in Residual Soil Under Rainfall

XIAO Zhaoyun¹, LI Mingguang²(), WANG Dafa², CHEN Jinjian²

1. College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China
2. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2019-01-08 Online:2020-08-28 Published:2020-08-18
Contact: LI Mingguang E-mail:lmg20066028@sjtu.edu.cn

摘要/Abstract

摘要：

残积土水稳性差,强度参数随饱和度和应变水平变化而变化.为了研究深厚残积土层中的基坑变形特性受降雨的影响,依托厦门某残积土深基坑工程开展围护桩变形和坑外地面沉降的监测;结合开挖工况和降雨数据,探讨降雨条件下残积土结构弱化对基坑支护结构和土层环境变形响应的影响.结果表明:基坑围护结构和土体的变形在连续降雨阶段较小,在雨停后的排水清淤阶段开始缓慢增大;排水清淤后继续开挖,基坑变形急剧增大.开挖结束后,基坑围护桩的最大侧向变形量约为无降雨影响下的1.5倍,坑外地表沉降的影响范围从开挖深度的1.5倍增至2.5倍.研究结果对受降雨影响的残积土基坑的工程应用具有一定的参考意义.

关键词: 基坑变形, 地表沉降, 残积土, 降雨

Abstract:

Residual soil has a poor water stability, whose strength varies with the changes of saturation and deformation. To study the deformation response of foundation pit in deep residual soil affected by rainfall, the deformation of retaining pile and ground surface settlement outside the pit was monitored based on a deep residual soil foundation pit project in Xiamen. Combining the excavation steps with rainfall data, the influence of the strength weakness of residual soil caused by rainfall on the deformation of retaining piles and soil was discussed. The results show that the deformation of retaining piles and soil settlements remains stable during rainfall, and increases slowly in the stage of drainage. However, as the excavation continues after drainage, the deformation increases significantly. The maximum lateral deformation affected by rainfall is about 1.5 times of that without rainfall. The influence range of the ground surface settlement on excavation depth increases from 1.5 to 2.5 times due to rainfall. The results have a certain reference significance for the engineering application of residual soil foundation pit affected by rainfall.

Key words: foundation pit deformation, ground surface settlement, residual soil, rainfall

中图分类号:

TU473.2

肖朝昀, 李明广, 王大发, 陈锦剑. 降雨影响下残积土层中深基坑变形特性测试及分析[J]. 上海交通大学学报, 2020, 54(8): 873-880.

XIAO Zhaoyun, LI Mingguang, WANG Dafa, CHEN Jinjian. Test and Analysis of Deformation Characteristics of Deep Foundation Pit in Residual Soil Under Rainfall[J]. Journal of Shanghai Jiaotong University, 2020, 54(8): 873-880.

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土层名称	γ/(kN·m^-3)	c/kPa	φ/(°)	E_s/MPa	σ₀/kPa	ν
杂填土	18.0	12	15	5.0	100	0.30
粉质黏土	19.0	30	13	5.5	200	0.28
残积砾质黏性土	19.4	25	22	6.0	230	0.26
全风化花岗岩	18.9	26	25	6.5	280	0.24
砂砾状强风化花岗岩	21.0	30	27	10.0	400	0.24
块状强风化花岗岩	22.0	50	28	—	800	0.22

降雨影响下残积土层中深基坑变形特性测试及分析

Test and Analysis of Deformation Characteristics of Deep Foundation Pit in Residual Soil Under Rainfall

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