考虑既有地铁车站阻隔效应的基坑抽水致沉模型试验研究

doi:10.13722/j.cnki.jrme.2022.1101

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Abstract In urban environment，the existing underground structures could exert a barrier effect on groundwater seepage and soil movement. According to current research results，this barrier effect would either aggravate or diminish the ground settlement，while the specific characteristics of ground deformation is associated with the types and spatial distribution of the underground structures. In this paper，laboratory-scale model tests were conducted to investigate the mechanism of dewatering-induced deformations when a foundation pit is adjacent to a pre-existing metro station. With installing deformation and stress sensors in the physical model of pit-strata-station，the variations of groundwater level outside the pit，ground surface settlements，wall deflections and lateral pressure on both sides of the enclosure wall were monitored in real time during dewatering. All the monitored results were compared with those from another model test without a subway station outside the pit under the same pumping conditions；based on the comparison，the impact mechanism of the barrier effect incurred by metro station on the dewatering-induced foundation pit deformation is revealed. Results show that as to the case with metro station outside the pit，the same dewatering operation as the case without metro station would induce smaller water yield of the pit，smaller enclosure wall deflection but greater ground surface settlement and greater groundwater drawdown on both sides of the enclosure wall. In foundation pit design，engineers could consider reducing the number of pumping wells to achieve the same pumping effect，and should evaluate the barrier effect of adjacent underground structures on foundation pit deformation to provide a more reasonable supporting scheme.

Key words： foundation engineering foundation pit dewatering barrier effect metro station groundwater drawdown foundation pit deformation laboratory-scale model test

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	Articles by authors
	ZENG Chaofeng1
	2
	CAI Gang1
	2
	ZHU Long1
	2
	ZHANG Zuhao1
	2
	CHEN Hongbo1
	2
	XUE Xiuli2
	LONG Sichun3
	LUO Guijun4

Cite this article:

ZENG Chaofeng1,2,CAI Gang1, et al. Laboratory-scale model test on settlement incurred by foundation pit dewatering considering the barrier effect of pre-existing metro station[J]. , 2023, 42(10): 2566-2577.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1101 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I10/2566

[1]	王志杰，周飞聪，周平，等. 基于强近接大型基坑单侧开挖卸载既有车站变形理论研究[J]. 岩石力学与工程学报，2020，39(10)：2 131-2 147.(WANG Zhijie，ZHOU Feicong，ZHOU Ping，et al. Research on deformation theory of existing stations based on single side excavation and unloading of large foundation pits with strong close connection[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(10)：2 131-2 147.(in Chinese))
[2]	曾超峰，王硕，宋伟炜，等. 内隔墙对开挖前抽水引发软土区地铁深基坑变形的控制效果[J]. 岩石力学与工程学报，2021，40(6)：1 277-1 286.(ZENG Chaofeng，WANG Shuo，SONG Weiwei，et al. Characteristics of ground deformation induced by pre-excavation dewatering considering blocking effect of adjacent structure[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(6)：1 277-1 286. (in Chinese))
[3]	李涛，杨依伟，贾奥运，等. 空间效应下狭长深基坑地表三维变形预测[J]. 中国矿业大学学报，2020，49(6)：1 101-1 110.(LI Tao，YANG Yiwei，JIA Aoyun，et al. Prediction of three-dimensional surface deformation of long and narrow deep foundation pit under spatial effect[J]. Journal of China University of Mining and Technology，2020，49(6)：1 101-1 110.(in Chinese))
[4]	曾超峰，白宁，袁志成，等. 邻近结构埋深对开挖前抽水引发基坑变形影响[J]. 中国矿业大学学报，2022，51(2)：283-292.(ZENG Chaofeng，BAI Ning，YUAN Zhicheng，et al. Effect of buried depth of adjacent structure on the foundation pit deformation during pre-excavation dewatering[J]. Journal of China University of Mining and Technology，2022，51(2)：283-292.(in Chinese))
[5]	张鑫海，魏纲，林心蓓. 考虑纵向变形影响的基坑下方盾构隧道横向受力变化研究[J]. 岩石力学与工程学报，2020，39(11)：2 351-2 364.(ZHANG Xinhai，WEI Gang，LIN Xinbei. Research on transverse force and deformation of shield tunnels below foundation pits considering influence of longitudinal deformation[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(11)：2 351-2 364.(in Chinese))
[6]	康成，叶超，梁荣柱，等. 基坑开挖诱发下卧盾构隧道纵向非线性变形研究[J]. 岩石力学与工程学报，2020，39(11)：2 341-2 350.(KANG Cheng，YE Chao，LIANG Rongzhu，et al. Nonlinear longitudinal deformation of underlying shield tunnels induced by foundation excavation[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(11)：2 341-2 350.(in Chinese))
[7]	徐长节，成守泽，蔡袁强，等. 非对称开挖条件下基坑变形性状分析[J]. 岩土力学，2014，35(7)：1 929-1 934.(XU Changjie，CHENG Shouze，CAI Yuanqiang，et al. Deformation characteristic analysis of foundation pit under asymmetric excavation condition[J]. Rock and Soil Mechanics，2014，35(7)：1 929-1 934.(in Chinese))
[8]	梁发云，袁强，李家平，等. 堆载作用下土体分层特性对地铁隧道纵向变形的影响研究[J]. 岩土工程学报，2020，42(1)：63-71.(LIANG Fayun，YUAN Qiang，LI Jiaping，et al. Influences of soil characteristics on longitudinal deformation of shield tunnels induced by surface surcharge[J]. Chinese Journal of Geotechnical Engineering，2020，42(1)：63-71.(in Chinese))
[9]	应宏伟，杨永文. 杭州深厚软黏土中某深大基坑的性状研究[J]. 岩土工程学报，2011，33(12)：1 838-1 846.(YING Hongwei，YANG Yongwen. Characteristics of a large and deep soft clay excavation in Hangzhou[J]. Chinese Journal of Geotechnical Engineering，2011，33(12)：1 838-1 846.(in Chinese))
[10]	丁洲祥，朱合华，丁文其，等. 地基沉降大变形有限元分析的几何刚度效应[J]. 岩土力学，2009，30(5)：1 275-1 280.(DING Zhouxiang，ZHU Hehua，DING Wenqi，et al. Effects of geometrical stiffness on foundation settlement by finite-strain finite element analysis[J]. Rock and Soil Mechanics，2009，30(5)：1 275-1 280.(in Chinese))
[11]	郑刚，曹剑然，程雪松，等. 考虑承压含水层间越流的地下水回灌现场试验研究[J]. 岩土工程学报，2019，41(9)：1 609-1 618. (ZHENG Gang，CAO Jianran，CHENG Xuesong，et al. Field tests on groundwater recharge considering leakage between semiconfined aquifers[J]. Chinese Journal of Geotechnical Engineering，2019，41(9)：1 609-1 618.(in Chinese))
[12]	刘祥勇，宋享桦，谭勇，等. 南通富水砂性地层地铁深基坑抽水回灌现场试验研究[J]. 岩土工程学报，2020，42(7)：1 331-1 340. (LIU Xiangyong，SONG Xianghua，TAN Yong，et al. Field tests on groundwater recharge of deep excavations in Nantong water-rich sandy stratum[J]. Chinese Journal of Geotechnical Engineering，2020，42(7)：1 331-1 340.(in Chinese))
[13]	杨清源，赵伯明. 潜水层基坑降水引起地表沉降试验与理论研究[J]. 岩石力学与工程学报，2018，37(6)：1 506-1 519.(YANG Qingyuan，ZHAO Boming. Experimental and theoretical study on the surface subsidence by dewatering of foundation pit in phreatic aquifer[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(6)：1 506-1 519.(in Chinese))
[14]	张兴胜，卢耀如，王建秀，等. 上海悬挂式地下连续墙基坑渗流侵蚀引起的沉降研究[J]. 岩土工程学报，2014，36(增2)：284-290.(ZHANG Xingsheng，LU Yaoru，WANG Jianxiu，et al. Land subsidence caused by pits seepage erosion of deep foundation with suspended diaphragm walls in Shanghai[J]. Chinese Journal of Geotechnical Engineering，2014，36(Supp.2)：284-290.(in Chinese))
[15]	王建秀，吴林高，朱雁飞，等. 地铁车站深基坑降水诱发沉降机制及计算方法[J]. 岩石力学与工程学报，2009，28(5)：1 010-1 019. (WANG Jianxiu，WU Lingao，ZHU Yanfei，et al. Mechanism of dewatering-induced ground subsidence in deep subway station pit and calculation method[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(5)：1 010-1 019.(in Chinese))
[16]	汪旭玮，杨天亮，许烨霜，等. 基坑降水效应的室内试验研究[J]. 中南大学学报：自然科学版，2019，50(11)：2 823-2 830.(WANG Xuwei，YANG Tianliang，XU Yeshuang，et al. Laboratory test on the effect of foundation pit dewatering[J]. Journal of Central South University：Science and Technology，2019，50(11)：2 823-2 830.(in Chinese))
[17]	许烨霜，沈水龙，马磊. 地下构筑物对地下水渗流的阻挡效应[J]. 浙江大学学报：工学版，2010，44(10)：1 902-1 906.(XU Yeshuang，SHEN Shuilong，MA Lei. Cutoff effect of groundwater seepage due to existence of underground structure[J]. Journal of Zhejiang University：Engineering Science，2010，44(10)：1 902-1 906.(in Chinese))
[18]	曹依雯，黄润秋，沈水龙，等. 基桩对含水层渗流阻挡作用效应研究[J]. 岩土力学，2014，35(6)：1 617-1 622.(CAO Yiwen，HUANG Runqiu，SHEN Shuilong，et al. Investigation of blocking effect on groundwater seepage of piles in aquifer[J]. Rock and Soil Mechanics，2014，35(6)：1 617-1 622.(in Chinese))
[19]	薛秀丽，廖欢，曾超峰，等. 既有地下结构水-土阻隔效应对基坑抽水引发地层变形影响机制[J/OL]. 岩土工程学报，http://kns.cnki.net/kcms/detail/32.1124.TU.20220217.1111.002.html. (XUE Xiuli，LIAO Huan，ZENG Chaofeng，et al. Barrier effect of existing underground structure on strata deformation induced by foundation pit dewatering[J/OL]. Chinese Journal of Geotechnical Engineering，https://kns.cnki.net/kcms/detail/32.1124.TU.20220217. 1111.002.(in Chinese))
[20]	曾超峰，张祖浩，高文华，等. 坑外群桩阻隔效应对基坑内抽水引发变形影响机制[J/OL]. 岩土工程学报，http://kns.cnki.net/kcms/detail/ 32.1124. TU.20220708.0948.002. html.(ZENG Chaofeng，ZHANG Zuhao，GAO Wenhua，et al. Barrier effect of surrounding group pile foundation on pit deformation induced by dewatering inside an excavation[J/OL]. Chinese Journal of Geotechnical Engineering，http://kns.cnki.net/kcms/detail/32.1124.TU.20220708.0948.002.(in Chinese))
[21]	郑刚，曾超峰. 基坑开挖前潜水降水引起的地下连续墙侧移研究[J]. 岩土工程学报，2013，35(12)：2 153-2 163.(ZHENG Gang，ZENG Chaofeng. Lateral displacement of diaphragm wall by dewatering of phreatic water before excavation[J]. Chinese Journal of Geotechnical Engineering，2013，35(12)：2 153-2 163.(in Chinese))
[22]	LIAO S M，WEI S F，SHEN S L. Structural responses of existing metro stations to adjacent deep excavations in Suzhou，China[J]. Journal of Performance of Constructed Facilities，2016，30(4)：04015089.
[23]	TAN Y，LI X，KANG Z，et al. Zoned excavation of an oversized pit close to an existing metro line in stiff clay：Case study[J]. Journal of Performance of Constructed Facilities，2015，29(6)：04014158.
[24]	XU Y S，YAN X X，SHEN S L，et al. Experimental investigation on the blocking of groundwater seepage from a waterproof curtain during pumped dewatering in an excavation[J]. Hydrogeology Journal，2019，27：2 659-2 672.