窄基坑围护墙插入深度优化解析及离心试验研究

doi:10.13722/j.cnki.jrme.2019.0963

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (2032 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract Compared with the wide foundation pit，the stability of the retaining wall of the narrow foundation pit is greatly improved due to its small excavation width. For narrow excavation engineering with a longitudinal length of several kilometers，optimization of the insertion depth of the retaining structure maybe bring significant economic benefits. Based on the narrow excavation of a cable tunnel in a city of Fujian province，the optimization of the insertion depth of the narrow excavation retaining structure was studied. The force and deformation characteristics of the retaining wall with different excavation widths were compared analytically. It is shown that with decreasing the excavation width，the horizontal additional load acting on the retaining wall，the internal force and deformation of the wall are greatly reduced. A new method for calculating the safety factor of anti-uplift stability of narrow excavation pits was put forward to improve the method proposed in the current specifications. The calculation results indicate that the safety factor obtained by the improved method is larger than that calculated by the current specification and that the insertion depth of the retaining wall calculated by the improved method can be reduced by 25%. For verification，centrifugal model tests were carried out. The test results show that，for narrow excavation pits，the calculation method of the critical insertion depth of the retaining structure provided by the code is indeed too conservative. Therefore，it is necessary to optimize the insertion depth of the retaining structure when designing a narrow excavation pit. The research can provide a theoretical basis for the optimal design of the retaining wall insertion depth of the narrow excavation pits.

Key words： soil mechanics narrow excavation excavation width insertion depth safety factor optimal design centrifugal model test

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LIU Yangbin1
	XIA Caichu1
	XU Chen1
	CHEN Xiaoxiang2

Cite this article:

LIU Yangbin1,XIA Caichu1,XU Chen1, et al. Analytical solution and centrifugal test for the optimization of retaining wall insertion depth in narrow foundation pits[J]. , 2020, 39(3): 593-607.

URL:

http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0963 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I3/593

[17]	MINDLIN R D. Force at a point in the interior of a semi-infinite solid[J]. Physics，1936，7(2)：195-202.
[8]	中华人民共和国行业标准编写组. JGJ 120-2012 建筑基坑支护技术规程[S] 北京：中国建筑工业出版社，2012.(The Professional Standards Compilation Group of Peoples Republic of China. JGJ 120-20l2 Technical specification for retaining and protection ofbuilding foundation excavations[S]. Beijing：China Architecture and Building Press，2012.(in Chinese))
[10]	陈孝湘，赵金飞，唐自强，等. 基于强度折减法的狭长基坑坑底抗隆起稳定研究[J]. 地下空间与工程学报，2015，11(增1)：59-64.(CHEN Xiaoxiang，ZHAO Jinfei，TANG Ziqiang，et al. Strength reduction approach for analyzing safety against basal heave of long narrow and deep excavation[J]. Chinese Journal of Underground Space and Engineering，2015，11(Supp.1)：59-64.(in Chinese))
[13]	王洪新. 考虑基坑形状和平面尺寸的抗隆起稳定安全系数及异形基坑的稳定性分析[J]. 岩石力学与工程学报，2015，34(12)：2 559- 2 571.(WANG Hongxin. A coefficient of heave-resistant stability considering shapes and plane sizes and its application to the stability analysis of shaped excavations[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(12)：2 559-2 571.(in Chinese))
[9]	中华人民共和国行业标准编写组. GB 50007—2012，建筑地基基础设计规范[S]. 北京：中国建筑工业出版社，2012.(The Professional Standards Compilation Group of Peoples Republic of China. GB 50007—2012 Code for design of building foundation[S]. Beijing：China Architecture and Building Press，2012.(in Chinese)
[2]	XU K J，POULOS H G. General elastic analysis of piles and pile groups[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2000，24(15)：1 109-1 138.
[3]	张陈蓉，黄茂松. 基坑开挖引起的邻近建筑物桩基变形受力响[J]. 岩土工程学报，2012，34(增1)：564-571.(ZHANG Chenrong，HUANG Maosong. Behavior of pile foundation due to excavation- induced lateral soil movement[J]. Chinese Journal of Geotechnical Engineering，2012，34(Supp.1)：564-571.(in Chinese))
[5]	张治国，赵其华，徐晨，等. 基于影像源法的基坑开挖对邻近单桩影响简化分析[J]. 岩土力学，2016，37(7)：2 011-2 020.(ZHANG Zhiguo，ZHAO Qihua，XU Chen，et al. Simplified analysis of adjacent single-pile response subjected to foundation pit excavation based on virtual image technique[J]. Rock and Soil Mechanics，2016，37(7)：2 011-2 020.(in Chinese))
[7]	ZHANG Z，HUANG M，XU C，et al. Simplified solution for tunnel-soil-pile interaction in Pasternaks foundation model[J]. Tunnelling and Underground Space Technology，2018，78(8)：146-158.
[1]	王洪新. 基坑宽度对围护结构稳定性的影响[J]. 土木工程学报，2011，44(6)：120-126.(WANG Hongxin. Influence of excavation width on enclosure-structure stability of foundation pits[J]. China Civil Engineering Journal，2011，44(6)：120-126.(in Chinese))
[11]	张飞，李镜培，孙长安，等. 软土狭长深基坑抗隆起破坏模式试验研究[J]. 岩土力学，2016，37(10)：2 825-2 832.(ZHANG Fei，LI Jingpei，SUN Changan，et al. Experimental study on basal heave failure mode of narrow-deep excavation in soft clay [J]. Rock and Soil Mechanics，2016，37(10)：2 825-2 832.(in Chinese))
[15]	俞建霖，龙岩，夏霄，等. 狭长型基坑工程坑底抗隆起稳定性分析[J]. 浙江大学学报：工学版，2017，51(11)：78-87.(YU Jianlin，LONG Yan，XIA Xiao，et al. Basal stability for narrow foundation pit[J]. Journal of Zhejiang University：Engineering Science，2017，51(11)：78-87.(in Chinese))
[18]	VESIC A B. Bending of beams resting on isotropic elastic solid[J]. Journal of the Engineering Mechanics Division，1961，87(2)：35-54.
[6]	ZHANG Z，ZHANG C，JIANG K，et al. Analytical prediction for tunnel-soil-pile interaction mechanics based on Kerr foundation model[J]. KSCE Journal of Civil Engineering，2019，23(6)：2 756- 2 771.
[16]	应宏伟，王小刚，张金红. 考虑基坑宽度影响的基坑抗隆起稳定分析[J]. 工程力学，2018，35(5)：118-124.(YING Hongwei，WANG Xiaogang，ZHANG Jinhong. Analysis on heave-resistant stability considering the effect of excavation width[J] Engineering Mechanics，2018，35(5)：118-124.(in Chinese))
[4]	ZHANG Z G，HUANG M S，WANG W D. Evaluation of deformation response for adjacent tunnels due to soil unloading in excavation engineering[J]. Tunnelling and Underground Space Technology，2013，38(9)：244-253.
[12]	朱东风，王国敏，刘文世. 基坑宽度对整体稳定性的影响分析[J]. 水运工程，2013，(12)：188-191.(ZHU Dongfeng，WANG Guomin，LIU Wenshi. Influence of excavation width on overall stability of pits[J]. Port and Waterway Engineering，2013，(12)：188-191.(in Chinese))
[14]	ZHAO S，CHEN Z，HUANG G. Effects of foundation pit width on the anti-overturn stability of its support structure under ground load[C]// GeoShanghai International Conference. Singapore：Springer，2018.