Effects of Overconsolidation and Structural Behaviors of Shanghai Clay on Deformation Caused by Deep Excavation
Publication: International Journal of Geomechanics
Volume 24, Issue 7
Abstract
Shanghai clay exhibits overconsolidation, soil structural, and small-strain characteristics. While there have been several studies on the effects of small-strain characteristics on the deformation caused by deep excavation, the effects of overconsolidation and structural behaviors on this deformation remain unexplored. Therefore, in this study, a constitutive model considering the aforementioned three characteristics is developed and then implemented in the commercial software program FLAC3D (version 7.00) to investigate the effects of overconsolidation and structural behaviors. Initially, validation and parametric study of the constitutive model are conducted based on a cylindrical numerical model. Subsequently, the constitutive model is validated by a well-documented case history of a deep excavation in Shanghai. Thereafter, the effects of overconsolidation and structural behaviors on wall deflection and ground settlement induced by deep excavation are investigated. It is observed that overconsolidation has a significant effect on the deformation induced by deep excavation, while the effect of soil structure is negligible. With an increase in excavation depth, the effect of overconsolidation on the deformation increases, and its effect on ground settlement is more significant than that on wall deflection. According to the results of the parametric study, it is revealed that by the time the shear strain induced by deep excavation reaches a maximum value, overconsolidation has partially degraded while soil structure has not yet collapsed, which accounts for the magnitude of the aforementioned effects induced by deep excavation.
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Data Availability Statement
All data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
We gratefully acknowledge the financial support from the National Natural Science Foundation of China (NSFC Grant No. 41727802), the Science and Technology Commission of Shanghai Municipality (No. 21DZ1204300), and the Program of Shanghai Academic Research Leader (No. 20XD1422100).
References
Asaoka, A., M. Nakano, and T. Noda. 1998. “Super loading yield surface concept for the saturated structured soils.” In Proc., 4th European Conf. on Numerical Methods in Geotechnical Engineering, 232–242. Berlin, Germany: Springer.
Asaoka, A., M. Nakano, and T. Noda. 2000a. “Superloading yield surface concept for highly structured soil behavior.” Soils Found. 40 (2): 99–110. https://doi.org/10.3208/sandf.40.2_99.
Asaoka, A., M. Nakano, T. Noda, and K. Kaneda. 2000b. “Delayed compression/consolidation of natural clay due to degradation of soil structure.” Soils Found. 40 (3): 75–85. https://doi.org/10.3208/sandf.40.3_75.
Asaoka, A., T. Noda, E. Yamada, K. Kaneda, and M. Nakano. 2002. “An elasto-plastic description of two distinct volume change mechanisms of soils.” Soils Found. 42 (5): 47–57. https://doi.org/10.3208/sandf.42.5_47.
Baudet, B., and S. Stallebrass. 2004. “A constitutive model for structured clays.” Géotechnique 54 (4): 269–278. https://doi.org/10.1680/geot.2004.54.4.269.
Bian, X., Z.-S. Hong, and J.-W. Ding. 2016. “Evaluating the effect of soil structure on the ground response during shield tunnelling in Shanghai soft clay.” Tunnelling Underground Space Technol. 58: 120–132. https://doi.org/10.1016/j.tust.2016.05.003.
Callisto, L., and S. Rampello. 2002. “Shear strength and small-strain stiffness of a natural clay under general stress conditions.” Géotechnique 52 (8): 547–560. https://doi.org/10.1680/geot.2002.52.8.547.
Chanmee, N., J. Chai, T. Hino, and J. Wang. 2017. “Methods for evaluating overconsolidation ratio from piezocone sounding results.” Underground Space 2: 182–194. https://doi.org/10.1016/j.undsp.2017.05.004.
Chen, C. B. 2017. “Depositional history, mechanical properties and constitutive modeling of Ningbo soft clay.” [In Chinese.] Master’s thesis, Dept. of Civil Engineering, Shanghai Jiao Tong Univ.
Dafalias, Y. F. 1986. “Bounding surface plasticity. I: Mathematical foundation and hypoplasticity.” J. Eng. Mech. 112 (9): 966–987. https://doi.org/10.1061/(ASCE)0733-9399(1986)112:9(966).
Dafalias, Y. F., and L. R. Herrmann. 1986. “Bounding surface plasticity. II: Application to isotropic cohesive soils.” J. Eng. Mech. 112 (12): 1263–1291. https://doi.org/10.1061/(ASCE)0733-9399(1986)112:12(1263).
Dassargues, A., P. Biver, and A. Monjoie. 1991. “Geotechnical properties of the Quaternary sediments in Shanghai.” Eng. Geol. 31: 71–90. https://doi.org/10.1016/0013-7952(91)90058-S.
DeGroot, D. J., M. E. Landon, and S. E. Poirier. 2019. “Geology and engineering properties of sensitive Boston Blue Clay at Newbury, Massachusetts.” AIMS Geosci. 5 (3): 412–447. https://doi.org/10.3934/geosci.2019.3.412.
Dong, Y., H. J. Burd, and G. T. Houlsby. 2017. “Finite element study of deep excavation construction processes.” Soils Found. 57: 965–979. https://doi.org/10.1016/j.sandf.2017.08.024.
Dong, Y. P., H. J. Burd, and G. T. Houlsby. 2016. “Finite-element analysis of a deep excavation case history.” Géotechnique 66 (1): 1–15. https://doi.org/10.1680/jgeot.14.P.234.
Hashiguchi, K. 1989. “Subloading surface model in unconventional plasticity.” Int. J. Solids Struct. 25 (8): 917–945. https://doi.org/10.1016/0020-7683(89)90038-3.
Hashiguchi, K., and M. Ueno. 1977. “Elastoplastic constitutive laws of granular material, Constitutive Equations of Soils.” In Proc., 9th Int. Conf. on Soil Mechanics and Foundation Engineering. Spec Ses 9, 73–82. Tokyo, Japan: JSSMFE.
Horpibulsuk, S., S. Shibuya, K. Fuenkajorn, and W. Katkan. 2007. “Assessment of engineering properties of Bangkok clay.” Can. Geotech. J. 44: 173–187. https://doi.org/10.1139/t06-101.
Hou, Y. M., J. H. Wang, and L. L. Zhang. 2009. “Finite-element modeling of a complex deep excavation in Shanghai.” Acta Geotech. 4: 7–16. https://doi.org/10.1007/s11440-008-0062-3.
Hu, Z. F., Z. Q. Yue, J. Zhou, and L. G. Tham. 2003. “Design and construction of a deep excavation in soft soils adjacent to the Shanghai Metro tunnels.” Can. Geotech. J. 40: 933–948. https://doi.org/10.1139/t03-041.
Kim, T. C., and M. Novak. 1981. “Dynamic properties of some cohesive soils of Ontario.” Can. Geotech. J. 18: 371–389. https://doi.org/10.1139/t81-044.
Li, Q., C. W. W. Ng, and G. B. Liu. 2012. “Determination of small-strain stiffness of Shanghai clay on prismatic soil specimen.” Can. Geotech. J. 49: 986–993. https://doi.org/10.1139/t2012-050.
Liu, M. D., and J. P. Carter. 2002. “A structured Cam Clay model.” Can. Geotech. J. 39: 1313–1332. https://doi.org/10.1139/t02-069.
Liu, G. B., R. J. Jiang, C. W. W. Ng, and Y. Hong. 2011. “Deformation characteristics of a 38m deep excavation in soft clay.” Can. Geotech. J. 48: 1817–1828. https://doi.org/10.1139/t11-075.
Liu, J.-X., J. Yang, Y.-J. Liu, S. Zhu, and F. Laouafa. 2022. “Numerical investigation of tunnelling effects on existing piles in structured clay.” Eur. J. Environ. Civ. Eng. 26 (16): 8502–8525. https://doi.org/10.1080/19648189.2022.2028192.
Mayne, P. W. 1988. “Determining OCR in clays from laboratory strength.” J. Geotech. Eng. 114 (1): 76–92. https://doi.org/10.1061/(ASCE)0733-9410(1988)114:1(76).
Meng, F., R. Chen, M. A. Mooney, H. Wu, and Q. Jia. 2022. “Evaluation of shield tunneling-induced soil disturbance in typical structured clays.” Bull. Eng. Geol. Environ. 81: 133. https://doi.org/10.1007/s10064-022-02625-y.
Mi, N. V. A., S. Thongchart, and W. Mairaing. 2023. “Geological and geotechnical properties of Mekong Delta Clay as comparison with Bangkok Clay.” Int. J. GEOMATE 24 (101): 22–32. https://doi.org/10.21660/2023.101.3601.
Nakai, T., and M. Hinokio. 2004. “A simple elastoplastic model for normally and over consolidated soils with unified material parameters.” Soils Found. 44 (2): 53–70. https://doi.org/10.3208/sandf.44.2_53.
Ng, C. W. W., B. Simpson, M. L. Lings, and D. F. T. Nash. 1998. “Numerical analysis of a multipropped excavation in stiff clay.” Can. Geotech. J. 35: 115–130. https://doi.org/10.1139/t97-074.
Ng, C. W. W., G. Zheng, J. Ni, and C. Zhou. 2020. “Use of unsaturated small-strain soil stiffness to the design of wall deflection and ground movement adjacent to deep excavation.” Comput. Geotech. 119: 103375. https://doi.org/10.1016/j.compgeo.2019.103375.
Peng, C. X. 2022. “Study on deformation characteristics of ultra-deep excavations considering the coupled hydro-mechanical effect due to dewatering in confined aquifers.” [In Chinese.] Master’s thesis, Dept. of Civil Engineering, Shanghai Jiao Tong Univ.
Peng, C.-X., N.-W. Liu, M.-G. Li, L. Zhen, and J.-J. Chen. 2022. “Hydro-mechanical coupled analyses on wall deformations caused by deep excavations and dewatering in a confined aquifer.” Acta Geotech. 17: 2465–2479. https://doi.org/10.1007/s11440-021-01408-1.
Soga, K. 1994. “Mechanical behavior and constitutive modelling of natural structured soils.” Ph.D. thesis, Dept. of Civil Engineering, Univ. of California.
Sun, D. A., and B. Chen. 2010. “Mechanical behavior of remolded overconsolidated Shanghai soft clay and its elastoplastic simulation.” [In Chinese.] Rock Soil Mech. 31 (6): 1739–1743+1751. https://doi.org/10.16285/j.rsm.2010.06.037.
Tanoli, A. Y., B. Yan, Y.-l. Xiong, G.-l. Ye, U. Khalid, and Z.-h. Xu. 2022. “Numerical analysis on zone-divided deep excavation in soft clays using a new small strain elasto–plastic constitutive model.” Underground Space 7: 19–36. https://doi.org/10.1016/j.undsp.2021.04.004.
Teng, F.-C., C.-Y. Ou, and P.-G. Hsieh. 2014. “Measurements and numerical simulations of inherent stiffness anisotropy in soft Taipei clay.” J. Geotech. Geoenviron. Eng. 140 (1): 237–250. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001010.
Wang, W. D., J. H. Wang, Q. Li, and Z. H. Xu. 2015. “Design and performance of large excavations for Shanghai Hongqiao International Airport Transport Hub using combined retaining structures.” J. Aerosp. Eng. 28 (6): A4014002. https://doi.org/10.1061/(ASCE)AS.1943-5525.0000435.
Wu, C.-j., G.-l. Ye, L.-l. Zhang, D. Bishop, and J.-h. Wang. 2015. “Depositional environment and geotechnical properties of Shanghai clay: A comparison with Ariake and Bangkok clays.” Bull. Eng. Geol. Environ. 74: 717–732. https://doi.org/10.1007/s10064-014-0670-0.
Yang, J., Z.-Y. Yin, X.-F. Liu, and F.-P. Gao. 2020. “Numerical analysis for the role of soil properties to the load transfer in clay foundation due to the traffic load of the metro tunnel.” Transp. Geotech. 23: 100336. https://doi.org/10.1016/j.trgeo.2020.100336.
Yao, Y.-P., W. Hou, and A.-N. Zhou. 2009. “UH model: Three-dimensional unified hardening model for overconsolidated clays.” Géotechnique 59 (5): 451–469. https://doi.org/10.1680/geot.2007.00029.
Ye, G.-l., and B. Ye. 2016. “Investigation of the overconsolidation and structural behavior of Shanghai clays by element testing and constitutive modeling.” Underground Space 1: 62–77. https://doi.org/10.1016/j.undsp.2016.08.001.
Yimsiri, S., and K. Soga. 2011. “Cross-anisotropic elastic parameters of two natural stiff clays.” Géotechnique 61 (9): 809–814. https://doi.org/10.1680/geot.9.P.072.
Yu, Y. L. 2015. “Mechanical properties and constitutive modeling of Shanghai 4th clay under different stress path.” [In Chinese.] Master’s thesis, Dept. of Civil Engineering, Shanghai Jiao Tong Univ.
Zhang, F., B. Ye, T. Noda, M. Nakano, and K. Nakai. 2007. “Explanation of cyclic mobility of soils: Approach by stress-induced anisotropy.” Soils Found. 47 (4): 635–648. https://doi.org/10.3208/sandf.47.635.
Zhang, F., B. Ye, and G. Ye. 2011. “Unified description of sand behavior.” Front. Archit. Civ. Eng. China 5 (2): 121–150. https://doi.org/10.1007/s11709-011-0104-z.
Zhang, S. 2019. “Small strain elasto-plastic model for over-consolidated and structural clay and its application.” [In Chinese.] Ph.D. thesis, Dept. of Civil Engineering, Shanghai Jiao Tong Univ.
Zhang, S., C. Liao, Q. Zhang, and L. Zhen. 2019. “Elastoplastic model for soils considering structure and overconsolidation.” J. Shanghai Jiaotong Univ. 24 (2): 196–203. https://doi.org/10.1007/s12204-019-2050-1.
Zhang, S., G. Ye, C. Liao, and J. Wang. 2018a. “Elasto-plastic model of structured marine clay under general loading conditions.” Appl. Ocean Res. 76: 211–220. https://doi.org/10.1016/j.apor.2018.04.011.
Zhang, S., G. Ye, and J. Wang. 2018b. “Elastoplastic model for overconsolidated clays with focus on volume change under general loading conditions.” Int. J. Geomech. 18 (3): 04018005. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001101.
Zhu, Y.-F., Y.-Z. Huang, Y.-P. Tan, and J.-J. Chen. 2015. “Stratified settlement characteristics of the soil strata in Shanghai due to dewatering.” J. Aerosp. Eng. 28 (6): A4014005. https://doi.org/10.1061/(ASCE)AS.1943-5525.0000453.
Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 24 • Issue 7 • July 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jun 1, 2023
Accepted: Feb 1, 2024
Published online: May 8, 2024
Published in print: Jul 1, 2024
Discussion open until: Oct 8, 2024
ASCE Technical Topics:
- Clays
- Consolidated soils
- Construction engineering
- Construction methods
- Continuum mechanics
- Deformation (mechanics)
- Engineering mechanics
- Excavation
- Geomechanics
- Geotechnical engineering
- Overconsolidated soils
- Soil deformation
- Soil mechanics
- Soil properties
- Soil structures
- Soils (by type)
- Solid mechanics
- Structural behavior
- Structural engineering
- Structural mechanics
- Structures (by type)
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