Responses of a short column-supported highrise tower to adjacent deep excavations in water-rich sandy strata and dynamic optimization of protection plans

Abstract

A highrise tower atop short columns in Nantong, China was threatened by excavation of a subway station nearby. Although an elaborate protection plan composed of isolation piles, artificial recharge and underpinning was executed throughout the excavations, the tower underwent unacceptable settlements and notable inclinations. In combination of field measurements and numerical simulations, this paper investigates the tower’s responses to the adjacent excavations, examines the effects of adopted protection plans and explores potential effective protection plans. First, the responses of the tower and the effectiveness of the three implemented measures were examined, and the contributory factors triggering intolerable tower deformations were identified; then, the effects of primary protection parameters were quantified, including the length, stiffness and layout of isolation piles, the water level surrounding recharge wells after recharging and the depth and location of wells, and the length of underpinning piles. It reveals that the underpinning plan had the best protection effect, followed by isolation piles and recharging wells. Construction timing of protection measures and termination manners of recharging are two critical factors in restraining tower deformations. Moreover, underpinning the tower with 36-m long steel pipe piles solely before implementation of adjacent excavations could be another optimal protection scheme.

Graphical abstract

Keywords

highrise tower / excavation / piled-raft footing / protection / field performance / numerical simulation

References

[1] Liu W, Wu X, Zhang L, Zheng J, Teng J. Global sensitivity analysis of tunnel-induced building movements by a precise metamodel. Journal of Computing in Civil Engineering, 2017, 31(5): 04017037

[2] Guo Y, Zheng J, Liu H. An early warning method for tunneling-induced ground surface settlement considering accident precursors and consequences. Tunnelling and Underground Space Technology, 2023, 140: 105214

[3] Liu J C, Tan Y. Review of through-wall leaking incidents during excavation of the subway stations of Nantong metro line 1 in thick water-rich sandy strata. Tunnelling and Underground Space Technology, 2023, 135: 105056

[4] Tan Y, Fan D, Lu Y. Statistical analyses on a database of deep excavations in Shanghai soft clays in China from 1995–2018. Practice Periodical on Structural Design and Construction, 2022, 27(1): 04021067

[5] Tan Y, Lu Y, Wang D. Catastrophic failure of Shanghai metro line 4 in July 2003: Postaccident rehabilitation. Journal of Performance of Constructed Facilities, 2023, 37(2): 04023006

[6] Liu J C, Tan Y. Hydraulic fracture failure during excavation of a working shaft for subway station: Forensic diagnosis and postfailure rehabilitation. Engineering Failure Analysis, 2024, 155: 107750

[7] Wang X W, Yang T L, Xu Y S, Shen S L. Evaluation of optimized depth of waterproof curtain to mitigate negative impacts during dewatering. Journal of Hydrolog, 2019, 577: 123969

[8] Xu Y S, Yan X X, Shen S L, Zhou A N. Experimental investigation on the blocking of groundwater seepage from a waterproof curtain during pumped dewatering in an excavation. Hydrogeology Journal, 2019, 27(7): 2659–2672

[9] Bolton M D, Lam S Y, Vardanega P J, Ng C W W, Ma X. Ground movements due to deep excavations in Shanghai: Design charts. Frontiers of Structural and Civil Engineering, 2014, 8(3): 201–236

[10] Xu G, Zhang J, Liu H, Ren C. Shanghai center project excavation induced ground surface movements and deformations. Frontiers of Structural and Civil Engineering, 2018, 12(1): 26–43

[11] Lyu H M, Shen S L, Wu Y X, Zhou A N. Calculation of groundwater head distribution with a close barrier during excavation dewatering in confined aquifer. Geoscience Frontiers, 2021, 12(2): 791–803

[12] Lin S S, Zhou A, Shen S L. Safety assessment of excavation system via TOPSIS-based MCDM modelling in fuzzy environment. Applied Soft Computing, 2023, 138: 110206

[13] Liu J C, Tan Y, Liao S M. Protection of a 193.5-m high concrete tube-shape TV tower close to subway excavations. Journal of Performance of Constructed Facilities, 2023, 37(5): 04023043

[14] Tan Y, Lu Y, Wang D. Interactive behaviors of four closely spaced mega excavations in soft clays: Case study on an excavation group in Shanghai, China. Tunnelling and Underground Space Technology, 2023, 138: 105186

[15] Fan D, Tan Y, Tang Y, Wang D. Evaluation of dewatering-induced hydraulic and ground responses of thick multi-aquifer sandy strata without aquitards. Environmental Earth Sciences, 2024, 83(1): 3

[16] Boone S J. Ground-movement-related building damage. Journal of Geotechnical Engineering, 1996, 122(11): 886–896

[17] CordingE JLongJ LSonMLaeferDGhahremanB. Assessment of excavation-induced building damage. In: 2010 Earth Retention Conference (ER2010). Washington, D.C.: ASCE Library, 2010, 101–120

[18] Liao S M, Wei S F, Shen S L. Structural responses of existing metro stations to adjacent deep excavations in Suzhou, China. Journal of Performance of Constructed Facilities, 2016, 30(4): 04015089

[19] Tan Y, Wei B. Observed behaviors of a long and deep excavation constructed by cut-and-cover technique in Shanghai soft clay. Journal of Geotechnical and Geoenvironmental Engineering, 2012, 138(1): 69–88

[20] Zhang R, Zheng J, Yu S. Responses of piles subjected to excavation-induced vertical soil movement considering unloading effect and interfacial slip characteristics. Tunnelling and Underground Space Technology, 2013, 36: 66–79

[21] Yang T, Tong L, Pan H, Wang Z, Chen X, Li H. Effect of excavation sequence on uplift deformation of underlying existing metro tunnel. Journal of Performance of Constructed Facilities, 2021, 35(2): 04021003

[22] Wan X, Ding J, Jiao N, Sun S, Liu J, Guo Q. Observed performance of long-zoned excavation with suspended waterproof curtain in Yangtze river floodplain. Journal of Performance of Constructed Facilities, 2022, 36(3): 04022018

[23] Liang R, Wu W, Yu F, Jiang G, Liu J. Simplified method for evaluating shield tunnel deformation due to adjacent excavation. Tunnelling and Underground Space Technology, 2018, 71: 94–105

[24] Feng S, Lei H, Wan Y, Jin H, Han J. Influencing factors and control measures of excavation on adjacent bridge foundation based on analytic hierarchy process and finite element method. Frontiers of Structural and Civil Engineering, 2021, 15(2): 461–477

[25] Shen S L, Lin S S, Zhou A. A cloud model-based approach for risk analysis of excavation system. Reliability Engineering & System Safety, 2023, 231: 108984

[26] Lin S S, Zhou A, Shen S L. Multi-status Bayesian network for analyzing collapse risk of excavation construction. Automation in Construction, 2024, 158: 105193

[27] Li J, Xie X, Zhang Q, Fang P, Wang W. Distress evaluation and remediation for a highrise building with pile-raft foundation. Journal of Performance of Constructed Facilities, 2014, 28(4): 04014005

[28] Li H, Tang Y, Liao S, Shen M. Structural response and preservation of historic buildings adjacent to oversized deep excavation. Journal of Performance of Constructed Facilities, 2021, 35(6): 04021095

[29] Mullins G. Construction QA/QC methods for postgrouting drilled shafts. Journal of Performance of Constructed Facilities, 2016, 30(4): 04015085

[30] Tan Y, Wang D. Structural behaviors of large underground earth-retaining systems in Shanghai. I: Unpropped circular diaphragm wall. Journal of Performance of Constructed Facilities, 2015, 29(2): 04014058

[31] Tan Y, Huang R, Kang Z, Bin W. Covered semi-top-down excavation of subway station surrounded by closely spaced buildings in downtown Shanghai: Building response. Journal of Performance of Constructed Facilities, 2016, 30(6): 04016040

[32] Zeng C F, Zheng G, Xue X L, Mei G X. Combined recharge: A method to prevent ground settlement induced by redevelopment of recharge wells. Journal of Hydrology, 2019, 568: 1–11

[33] Zhang L, Wu X, Skibniewski M J, Fang W, Deng Q. Conservation of historical buildings in tunneling environments: Case study of Wuhan metro construction in China. Construction and Building Materials, 2015, 82: 310–322

[34] Zhang Y Q, Li M G, Wang J H, Chen J J, Zhu Y F. Field tests of pumping-recharge technology for deep confined aquifers and its application to a deep excavation. Engineering Geology, 2017, 228: 249–259

[35] Zheng G, Pan J, Cheng X, Bai R, Du Y, Diao Y, Ng C W W. Use of grouting to control horizontal tunnel deformation induced by adjacent excavation. Journal of Geotechnical and Geoenvironmental Engineering, 2020, 146(7): 05020004

[36] Shen S L, Lyu H M, Zhou A, Lu L H, Li G, Hu B B. Automatic control of groundwater balance to combat dewatering during construction of a metro system. Automation in Construction, 2021, 123: 103536

[37] Feng S J, Lu S F. Failure of a retaining structure in a metro station excavation in Nanchang city, China. Journal of Performance of Constructed Facilities, 2016, 30(4): 04015097

[38] Jiang W, Tan Y. Heavy rainfall-related excavation failures in China during 1994 to 2018: An overview. Engineering Failure Analysis, 2021, 129: 105695

[39] Long Y Y, Tan Y. Soil arching due to leaking of tunnel buried in water-rich sand. Tunnelling and Underground Space Technology, 2020, 95: 103158

[40] Tan Y, Lu Y. Forensic diagnosis of a leaking accident during excavation. Journal of Performance of Constructed Facilities, 2017, 31(5): 04017061

[41] Jiang W, Tan Y. Overview on failures of urban underground infrastructures in complex geological conditions due to heavy rainfall in China during 1994–2018. Sustainable Cities and Society, 2022, 76: 103509

[42] Hsieh P G, Ou C Y. Shape of ground surface settlement profiles caused by excavation. Canadian Geotechnical Journal, 1998, 35(6): 1004–1017

[43] Oztoprak S, Cinicioglu S F, Oztorun N K, Alhan C. Impact of neighbouring deep excavation on high-rise sun plaza building and its surrounding. Engineering Failure Analysis, 2020, 111: 104495

[44] Tan Y, Lu Y. Parametric studies of DDC-induced deflections of sheet pile walls in soft soils. Computers and Geotechnics, 2009, 36(5): 902–910

[45] Tan Y, Lu Y, Xu C, Wang D. Investigation on performance of a large circular pit-in-pit excavation in clay-gravel-cobble mixed strata. Tunnelling and Underground Space Technology, 2018, 79: 356–374

[46] TanYWeiBLuYYangB. Is basal reinforcement essential for long and narrow subway excavation bottoming out in Shanghai soft clay? Journal of Geotechnical and Geoenvironmental Engineering, 2019, 145(5): 05019002

[47] Zeng C F, Chen H B, Liao H, Xue X L, Chen Q N, Diao Y. Behaviours of groundwater and strata during dewatering of large-scale excavations with a nearby underground barrier. Journal of Hydrology, 2023, 620: 129400

[48] Zheng G, He X, Zhou H, Diao Y, Li Z, Liu X. Performance of inclined-vertical framed retaining wall for excavation in clay. Tunnelling and Underground Space Technology, 2022, 130: 104767

[49] Yang T, Tong L, Hesham El Naggar M, Yan X. Hydraulic head difference at two sides of suspended waterproof curtain during multi-grade dewatering of excavation. Underground Space, 2023, 10: 137–149

[50] Zhang M, Zhang Z, Li Z, Li P. Axisymmetric arc sliding method of basal heave stability analysis for braced circular excavations. Symmetry, 2018, 10(5): 179

[51] Dong Y, Burd H, Houlsby G, Hou Y. Advanced finite element analysis of a complex deep excavation case history in Shanghai. Frontiers of Structural and Civil Engineering, 2014, 8(1): 93–100

[52] Ong D E L, Jong S C, Cheng W C. Ground and groundwater responses due to shaft excavation in organic soils. Journal of Geotechnical and Geoenvironmental Engineering, 2022, 148(8): 05022003

[53] SchanzTVermeerP ABonnierP G. The hardening soil model: Formulation and verification. In: Beyond 2000 in Computational Geotechnics. London: Taylor & Francis Group, 1999, 16

[54] Kang Y, Geng Z, Chen L, Zhu Y, Li K, Liu B. Ground reinforcement method for closely spaced overlapping tunnels passing beneath high-speed railway bridge. Journal of Geotechnical and Geoenvironmental Engineering, 2022, 148(12): 05022007

[55] Wu Y X, Shen S L, Xu Y S, Yin Z Y. Characteristics of groundwater seepage with cut-off wall in gravel aquifer. I: Field observations. Canadian Geotechnical Journal, 2015, 52(10): 1526–1538

[56] Wu Y X, Shen S L, Yuan D J. Characteristics of dewatering induced drawdown curve under blocking effect of retaining wall in aquifer. Journal of Hydrology, 2016, 539: 554–566

[57] Zheng G, Ha D, Zeng C, Cheng X, Zhou H, Cao J. Influence of the opening timing of recharge wells on settlement caused by dewatering in excavations. Journal of Hydrology, 2019, 573: 534–545

[58] Feng Q, Yuan X, Zhan H. Flow to a partially penetrating well with variable discharge in an anisotropic two-layer aquifer system. Journal of Hydrology, 2019, 578: 124027

[59] Zheng G, Cao J R, Cheng X S, Ha D, Wang F J. Experimental study on the artificial recharge of semiconfined aquifers involved in deep excavation engineering. Journal of Hydrology, 2018, 557: 868–877

[60] Liu N W, Peng C X, Li M G, Chen J J. Hydro-mechanical behavior of a deep excavation with dewatering and recharge in soft deposits. Engineering Geology, 2022, 307: 106780

[61] Zhang Y Q, Wang J H, Chen J J, Li M G. Numerical study on the responses of groundwater and strata to pumping and recharge in a deep confined aquifer. Journal of Hydrology, 2017, 548: 342–352

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