深基坑内支撑拆除时支护结构水平位移计算方法

doi:10.13722/j.cnki.jrme.2021.0474

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

Download: PDF (881 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract The dismantling of the inner support in deep foundation pit caused the deformation of the retaining structures，which has a significant impact on the surrounding environment. The space curve differential equations for retaining structures within each independent coor-dinnates system were proposed by applying the Winkler elastic foundation beam theory. And the non-limit equilibrium state of soil pressure of retaining structures was considered，and the reduction coefficient μ was uesd to quantitatively describe load reduction in horizontal direction during the transformation of basement structural plate and inner support. Then the deformation of retaining structures by this numerical method were solved. And taking the deep excavation project of Xiaguangli building of Chaoyang District and Shenzhen Pingan building as a background，the horizontal deformation of the retaining structures in different stages of the dismantling inner support was calculated，and the influence of the process of the dismantling inner support on the horizontal displacement of the retaining structures was analyzed. The results show that the calculated values of this method are close to the site monitoring date. During the process of dismantling inner support，the horizontal displacement of the retaining structures is approximately a parabola like curve with the maximum point moving upward. The increment of horizontal displacement is mainly concentrated above 1/2H depth of retaining structures. The value range of reduction coefficient from 0.1 to 0.3 is reasonable. The influence of value on the deformation of retaining structures decreases with the increase of depth. The horizontal displacement of retaining structures below excavation depth is not affected by value.

Key words： foundation pit engineering deep foundation elastic foundation beam inner support demolition horizontal displacement field monitoring

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LI Tao1
	YANG Yiwei1
	ZHOU Yuqi2
	LIU Bo1
	3
	ZHENG Qun2
	ZHENG Yixue1

Cite this article:

LI Tao1,YANG Yiwei1,ZHOU Yuqi2, et al. Analytical solution of horizontal displacement of retaining structures in deep foundation pit during dismantling inner support[J]. , 2022, 41(S1): 3021-3032.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0474 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/3021

[1] 顾拥武. 深基坑钢支撑拆除后围护墙稳定性影响分析[J]. 铁道标准设计，2007，41(6)：125–127.(GU Yongwu. Analysis of the influence of the stability of retaining piles after the removal of steel braces in deep foundation pits[J]. Railway Standard Design，2007，41(6)：125–127.(in Chinese))
[2] CUI X Y，YE M G，ZHUANG Y，et al. Performance of a foundation pit supported by bored piles and steel struts：A case study[J]. Soils and Foundations，2018，58(4)：1 016–1 027.
[3] 李涛，江永华，朱连华，等. 桩–土相互作用支护桩受力变形   计算方法[J]. 西南交通大学学报，2016，51(1)：14–21.(LI Tao，JIANG Yonghua，ZHU Lianhua，et al. A novel method for calculating stress and deformation of supporting pile considering pile-soil interaction[J]. Journal of Southwest Jiaotong University，2016，51(1)：14–21.(in Chinese))
[4] 李涛，朱连华，李彬如，等. 深基坑开挖土拱效应影响因素研究[J]. 中国矿业大学学报，2017，46(1)：58–65.(LI Tao，ZHU Lianhua，LI Binru，et al. Study of the influencing factors of soil arching effect for deep foundation pit excavation[J]. Journal of China University of Mining and Technology，2017，46(1)：58–65.(in Chinese))
[5] 杨光华. 深基坑支护结构的实用计算方法及其应用[J]. 岩土力学，2004，25(12)：1 885–1 896.(YANG Guanghua. Practical calculation method of retaining structures for deep excavations and its application[J]. Rock and Soil Mechanics，2004，25(12)：1 885–      1 896.(in Chinese))
[6] 盛棋楸，唐忠德. 支撑拆除对基坑周边环境影响的分析与计算[J]. 建筑施工，1998，20(6)：41–43.(SHENG Qiqiu，TANG Zhongde. Analysis and calculation of the influence of support demolition on the surrounding environment of foundation pit[J]. Architectural Construction，1998，20(6)：41–43.(in Chinese))
[7] 刘波，刘清楠，赵一燕. 超深基坑内支撑拆除过程中基坑变形规律研究[J]. 河北工程大学学报：自然科学版，2014，31(3)：17–21. (LIU Bo，LIU Qingnan，ZHAO Yiyan. The study of deformation law of a super deep foundation pit in the process of dismantling inner support[J]. Journal of Hebei University of Engineering：Natural Science，2014，31(3)：17–21.(in Chinese))
[8] 张忠苗，房凯，刘兴旺，等. 粉砂土地铁深基坑支撑轴力监测分析[J]. 岩土工程学报，2010，32(增1)：426–429.(ZHANG Zhongmiao，FANG Kai，LIU Xingwang，et al. Monitoring analysis of axial forces of strut for deep foundation pits of subway station in silty sand[J]. Chinese Journal of Geotechnical Engineering，2010，32(Supp.1)： 426–429.(in Chinese))
[9] 周予启，任耀辉，刘卫未，等. 深圳平安金融中心超深基坑混凝土支撑拆除关键技术[J]. 施工技术，2015，44(1)：32–36.(ZHOU Yuqi，REN Yaohui，LIU Weiwei，et al. The key technology of demolition for super deep foundation excavation concrete support of Shenzhen Ping?an Financial Center[J]. Construction Technology，2015，44(1)：32–36.(in Chinese))
[10] 朱小军. 软土深基坑工程控制拆撑变形的换撑设计方法[J]. 岩土工程学报，2010，32(增1)：256–260.(ZHU Xiaojun. Design of support replacement for controlling deformation caused by support dismantling of deep foundation pits in soft ground[J]. Chinese Journal of Geotechnical Engineering，2010，32(Supp.1)：256–260.(in Chinese))
[11] 刘燕，刘俊岩，辛振宇，等. 排墙+斜撑组合支撑系统的换撑技术研究[J]. 岩土工程学报，2010，32(增1)：306–311.(LIU Yan，LIU Junyan，XIN Zhenyu，et al. Support replacement technology of bracing system with oblique bracing+piles in row[J]. Chinese Journal of Geotechnical Engineering，2010，32(Supp.1)：306–311.(in Chinese))
[12] 刘向科，许世雄，张林，等. 苏州某地下空间工程深基坑混凝土支撑拆除工序优化技术[J]. 施工技术，2017，46(5)：25–28.(LIU Xiangke，XU Shixiong，ZHANG Lin，et al. Process optimizing technology of concrete support demolition for deep foundation excavation of some underground space engineering in Suzhou[J]. Construction Technology，2017，46(5)：25–28.(in Chinese))
[13] 刘伟，董超，徐岗，等. 临地铁超深基坑复杂混凝土内支撑拆除施工技术[J]. 施工技术，2017，46(6)：8–11.(LIU Wei，DONG Chao，XU Gang，et al. Demolition construction of the complex concrete internal bracingin deep foundation excavation adjacent to the subway[J]，2017，46(6)：8–11.(in Chinese))
[14] 刘学增，朱合华. 支撑拆除过程对墙体变形与内力的影响分析[J]. 地下空间，2000，20(1)：47–50.(LIU Xuezheng，ZHU Hehua. Analysis on the influence of support removing on the deformation of wall and the internal force[J]. Underground Space，2000，20(1)：47–50.(in Chinese))
[15] 崔奕，李养平，王波，等. 基坑支护支撑拆除过程的弹塑性有限元分析[J]. 地铁与轻轨，2002，15(1)：14–15.(CUI Yi，LI Yangping，WANG Bo，et al. Elastoplastic finite element analysis of removal process of foundation pit support[J]. Metro and Light Rail，2002，15(1)：14–15.(in Chinese))
[16] 刘国彬，王卫东. 基坑工程手册[M]. 北京：中国建筑工业出版社，2009：608–615.(LIU Guobin，WANG Weidong. Handbook of foundation pit engineering[M]. Beijing：China Construction Industry Press，2009：608–615.(in Chinese))
[17] 曹忠民，王奇松，杨一炯. 地铁基坑钢支撑架设与拆除安全监控[J].建筑技术，2012，43(6)：493–496.(CAO Zhongmin，WANG Qisong，YANG Yijiong. Safety monitoring on installation and dismantlement of steel support in subway foundation pit[J]. Architectural Technology，2012，43(6)：493–496.(in Chinese))
[18] 李涛，邵文，郑力蜚，等. 岩–土复合地层深基坑支护桩变形计算方法[J]. 中国矿业大学学报，2019，48(3)：511–519.(LI Tao，SHAO Wen，ZHENG Lifei，et al. Analytical solution of retaining pile?s deformation for deep soil-stone composite foundation[J]. Journal of China University of Mining and Technology，2019，48(3)：511–519.(in Chinese))
[19] 梅国雄，宰金珉. 考虑变形的朗肯土压力模型[J]. 岩石力学与工程学报，2001，20(6)：851–854.(MEI Guoxiong，ZAI Jinmin. Rankine earth pressure model considering deformation[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(6)：851–854.(in Chinese))
[20] CASPE M S. Surface settlement adjacent to braced opencuts[J]. Journal of the Soil Mechanics and Foundation，1966，92(4)：51–59.
[21] 刘兴旺，益德清，施祖元. 基坑开挖地表沉陷理论分析[J]. 土木工程学报，2000，33(4)：51–55.(LIU Xingwang，YI Deqing，SHI Zuyuan. Theoretical analysis of surface settlement during excavation[J]. China Civil Engineering Journal，2000，33(4)：51–55.(in Chinese))
[22] 李超，卫龙武. 主动极限位移规律与主动土压力位移探讨[J]. 岩石力学，2008，29(11)：3 165–3 169.(LI Chao，WEI Longwu. Rule of active limiting displacement and calculation method of active   earth pressure[J]. Rock Mechanics，2008，29(11)：3 165–3 169.(in Chinese))
[23] 吴恒立. 计算推力桩的综合刚度原理和双参数法[M]. 北京：人民交通出版社，2000：4–21.(WU Hengli. Principle of comprehensive stiffness and two parameter method for calculating thrust pile[M]. Beijing：People?s Communications Press，2000：4–21.(in Chinese))