Abstract
The number of pit-in-pit foundation pit is increasing quickly because of the continuous utilization of underground spaces in urban areas. Based on the co-construction project of Shanghai Museum of Natural History foundation pit and Shanghai Metro Line 13 foundation pit in Shanghai, China, the deformation characteristics of pit-in-pit foundation pit are researched by field observation and centrifugal model tests. The lateral wall displacement of inner foundation pit includes global deformation caused by the outer foundation pit excavation and deflection caused by the excavation of itself. The effect of inner foundation pit excavation on the lateral wall displacement of outer foundation pit and ground-surface settlement is smaller. The two factors affecting the deformation characteristics of pit-in-pit foundation pit, the distance between inner and outer foundation pits (D) and the excavation width of inner foundation pit (Win), are analyzed by centrifugal model tests. The result shows that the maximum lateral wall displacements of inner and outer foundation pits decrease nearly linearly with the increase of D, but increase with the increase of Win.
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Chen RP, Meng FY, Li ZC, Ye YH, Ye JN (2016) Investigation of response of metro tunnels due to adjacent large excavation and protective measures in soft soils. Tunnelling and Underground Space Technology 58(9): 224–235, DOI: https://doi.org/10.1016/j.tust.2016.06.002
Finno R, Blackburn JT, Roboski JF (2007) Three-dimensional effects for supported excavations in clay. Journal of Geotechnical and Geoenvironmental Engineering 133(1):30–36, DOI: https://doi.org/10.1061/(asce)1090-0241(2007)133:1(30)
Gong XN (2005) Considerations on foundation pit engineering. China Civil Engineering Journal 38(9):99–102+108 (in Chinese)
Hsieh PG, Ou CY (1998) Shape of ground surface settlement profiles caused by excavation. Canadian Geotechnical Journal 35(6):1004–1017, DOI: https://doi.org/10.1139/t98-056
Huo JS, Gong QM, Chen J (2011) Analysis of the deformation of retaining structure of pit-in-pit excavation. Journal of Civil, Architectural & Environmental Engineering 33(sup.1):139–142, DOI: CNKI:SUN:JIAN.0.2011-S1-035 (in Chinese)
Ji X, Ni P, Zhao W, Yu H (2019) Top-down excavation of an underpass linking two large-scale basements in sandy soil. Arabian Journal of Geosciences 12(10):314–324, DOI: https://doi.org/10.1007/s12517-019-4493-y
JSA (1998) Guideline of design and construction of deep excavation. Japanese Society of Architecture, Tokyo, Japan
Kammoun Z, Fourati M, Smaoui H (2019) Direct limit analysis based topology optimization of foundations. Soils and Foundations 59(4): 1063–1072, DOI: https://doi.org/10.1016/j.sandf.2019.05.003
Li EP, Zhuang XY, Zheng WB, Cai YC (2014) Effect of graph generation on slope stability analysis based on graph theory. Journal of Rock Mechanics and Geotechnical Engineering 6(4):380–386, DOI: https://doi.org/10.1016/j.jrmge.2014.05.003
Liu JH, Liu GB, Fan YQ (1999) The theory and its practice by using the rule of time-space-effect in soft soil excavation. Undergrourd Engineering and Tunmels 1993(3):7–12, DOI: https://doi.org/10.13547/j.cnki.dxgcysd.1999.03.002 (in Chinese)
Ou CY, Hsieh PG, Chiou DC (1993) Characteristics of ground surface settlement during excavation. Canadian Geotechnical Journal 30(5):758–767, DOI: https://doi.org/10.1139/t93-068
Peck RB (1969) Deep excavations and tunneling in soft ground. In: 7th international conference on soil mechanics and foundation engineering, Mexico City, Mexico, 225–290
PSCG (2000) Specification for excavation in Shanghai metro construction. Professional Standards Compilation Group, Shanghai, China
Sun YY (2016) Experimental and theoretical investigation on the stability of deep excavations against confined aquifers in Shanghai, China. KSCE Journal of Civil Engineering 20(11):2746–2754, DOI: https://doi.org/10.1007/s12205-016-0488-3
Sun YY, Zhou SS, Luo Z (2017) Basal-heave analysis of pit-in-pit foundation pits in soft clays. Computers and Geotechnics 81(1): 294–306, DOI: https://doi.org/10.1016/j.compgeo.2016.09.003
Tan Y, Wang DL (2013a) Characteristics of a large-scale deep foundation pit excavated by the central-island technique in Shanghai soft clay I: Bottom-up construction of the central cylindrical shaft. Journal of Geotechnical and Geoenvironmental Engineering 139(11):1875–1893, DOI: https://doi.org/10.1061/(ASCE)GT.1943-5606.0000928
Tan Y, Wang DL (2013b) Characteristics of a large-scale deep foundation pit excavated by the central-island technique in Shanghai soft clay II: Top-down construction of the peripheral rectangular pit. Journal of Geotechnical and Geoenvironmental Engineering 139(11):1894–1910, DOI: https://doi.org/10.1061/(ASCE)GT.1943-5606.0000929
Tan Y, Wei B, Diao YP, Zhou X (2014) Spatial corner effects of long and narrow multi-propped deep excavations in Shanghai soft clay. Journal of Performance of Constructed Facilities 28(4):04014015-1–17
TGS (2001) Design specifications for the foundation of buildings. Taiwan Geotechnical Society, Taipei, Taiwan
Wang JH, Xu ZH, Wang WD (2010) Wall and ground movements due to deep excavations in Shanghai soft soils. Journal of Geotechnical and Geoenvironmental Engineering 136(7):985–994, DOI: https://doi.org/10.1061/(ASCE)GT.1943-5606.0000299
Xiao HJ, Zhou SS, Sun YY (2019) Wall deflection and ground surface settlement due to excavation width and foundation pit classification. KSCE Journal of Civil Engineering 23(4):1537–1547, DOI: https://doi.org/10.1007/s12205-019-1712-8
Xu YZ, Liao SM, Zhou XH, Shen ML (2012) A computation method of equivalent depth for pit-in-pit excavation structural design in soft ground of Shanghai. Rock and Soil Mechanics 33(9):2736–2762, DOI: CNKI:SUN:YTLX.0.2012-09-032 (in Chinese)
Yang X, Liu GB (2017) Performance of a large-scale metro interchange station excavation in Shanghai soft clay. Journal of Geotechnical and Geoenvironmental Engineering 143(6):05017003.1–05017003.11, DOI: https://doi.org/10.1061/(ASCE)GT.1943-5606.0001681
Zhang DW, Shu JC, Sun JP (2017) Observed deformation characteristics of a deep excavation for the spring area in Jinan, China. Journal of Mountain Science 14(3):581–594, DOI: https://doi.org/10.1007/s11629-016-4038-8
Zhang YM, Zhuang XY, Lackner R (2018) Stability analysis of shotcrete supported crown of NATM tunnels with discontinuity layout optimization. International Journal for Numerical and Analytical Methods in Geomechanics 42(11):1199–1216, DOI: https://doi.org/10.1002/nag.2775
Zhou SW, Zhuang XY, Rabczuk T (2018a) A phase-field modeling approach of fracture propagation in poroelastic media. Engineering Geology 240(5):189–203, DOI: https://doi.org/10.1016/j.enggeo.2018.04.008
Zhou SW, Zhuang XY, Rabczuk T (2019) Phase field modeling of brittle compressive-shear fractures in rock-like materials: A new driving force and a hybrid formulation. Computer Methods in Applied Mechanics and Engineering 355(1):729–752, DOI: https://doi.org/10.1016/j.cma.2019.06.021
Zhou SW, Zhuang XY, Zhu HH, Rabczuk T (2018b) Phase field modeling of crack propagation, branching and coalescence in rocks. Theoretical and Applied Fracture Mechanics 96:174–192, DOI: https://doi.org/10.1016/j.tafmec.2018.04.011
Zhu HH, Zhuang XY, Cai YC, Ma GW (2011) High rock slope stability analysis using the enriched meshless shepard and least squares method. International Journal of Computational Methods 8(2):209–228, DOI: https://doi.org/10.1142/S0219876211002551
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The financial support received from the Anhui Provincial Top-notch Talent Plan (No. gxbjZD40), Anhui Provincial University Scientific Research Foundation (No. KJ2019A0705) and Anhui Provincial Outstanding Young Talents Major Plan (No. gxyqZD2019074), are gratefully acknowledged.
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Sun, Y., Xiao, H. Wall Displacement and Ground-Surface Settlement Caused by Pit-in-Pit Foundation Pit in Soft Clays. KSCE J Civ Eng 25, 1262–1275 (2021). https://doi.org/10.1007/s12205-021-1120-8
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DOI: https://doi.org/10.1007/s12205-021-1120-8