Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2024 , Vol. 58 >Issue 7: 1047 - 1056

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2022.468

Naval Architecture, Ocean and Civil Engineering

Analysis of Consolidated Bearing Capacity of Shallow Foundations Based on Characteristics Method

Expand
  • 1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2. Shanghai Key Laboratory for Digital Operation and Maintenance of Buildings and Infrastructure, Shanghai 200240, China

Received date: 2022-11-21

  Revised date: 2023-01-24

  Accepted date: 2023-03-09

  Online published: 2023-03-20

Fold

Abstract

To evaluate the bearing capacity evolution of subsea shallow foundations during operation, an undrained shear strength distribution of clay seabed following full consolidation due to preloading was deduced. The characteristics method was used to derive the stress characteristics equation and to evaluate the consolidated bearing capacity of shallow foundations. The influence of preloading ratio, soil inhomogeneity, effective internal friction angle, and foundation dimension on the consolidated bearing capacity of shallow foundations was investigated. The result shows that the relationship between the relative gain in the consolidated bearing capacity of shallow foundations and the preloading ratio is approximately linear. Meanwhile, the relative gain in consolidated bearing capacity is jointly determined by soil inhomogeneity and effective internal friction angle and is not affected by the foundation dimension individually. The accuracy and effectiveness of the proposed method were verified by comparing it with the results of soil-water coupled finite element analysis. Finally, possible errors between the characteristics solution and finite element model (FEM) results were analyzed. It was found that the discrepancy in the pore pressure calculation was the main reason for the disparity in the prediction of consolidated bearing capacity obtained by two methods. This characteristics solution can quickly and accurately predict the growth of consolidated bearing capacity of shallow foundations, which provides important reference for the optimal design of subsea shallow foundations.

Key words： clay seabed; shallow foundation; consolidated bearing capacity; characteristics method; preloading

Cite this article

LI Zhijian, LIAO Chencong, ZHANG Lulu, YE Guanlin . Analysis of Consolidated Bearing Capacity of Shallow Foundations Based on Characteristics Method[J]. Journal of Shanghai Jiaotong University, 2024 , 58(7) : 1047 -1056 . DOI: 10.16183/j.cnki.jsjtu.2022.468

References

[1] 谭越, 王春升, 陈国龙. 可移动生产储油平台的应用与发展[J]. 中国造船, 2011, 52 (Sup.1): 159-165.
  TAN Yue, WANG Chunsheng, CHEN Guolong. Recent development and application of mobile production storage platform[J]. Shipbuilding of China, 2011, 52 (Sup.1): 159-165.
[2] FENG X, GOURVENEC S. Consolidated undrained load-carrying capacity of subsea mudmats under combined loading in six degrees of freedom[J]. Géotechnique, 2015, 65(7): 563-575.
[3] KINOSHITA M, TOBIN H, ASHI J, et al. Data report:Permeability, compressibility, stress state, and grain size of shallow sediments from Sites C0004, C0006, C0007, and C0008 of the Nankai accretionary complex[C]//Proceedings of the Integrated Ocean Drilling Program. Netherlands: IODP, 2011: 1-11.
[4] TANIKAWA W, HIROSE T, HAMADA Y, et al. Porosity, permeability, and grain size of sediment cores from gas-hydrate-bearing sites and their implication for overpressure in shallow argillaceous formations: Results from the national gas hydrate program expedition 02, Krishna-Godavari Basin, India[J]. Marine and Petroleum Geology, 2019, 108: 332-347.
[5] 陈希有, 曾国熙, 龚晓南. 各向异性和非匀质地基上条形基础承载力的滑移场解法[J]. 浙江大学学报, 1988(3): 65-74.
  CHEN Xiyou, ZENG Guoxi, GONG Xiaonan. Characteristics solution for bearing capacity of strip foundation on anisotropic and non-homogeneous soil[J]. Journal of Zhejiang University, 1988(3): 65-74.
[6] 黄茂松, 秦会来, 郭院成. 非均质和各向异性黏土地基承载力的上限解[J]. 岩石力学与工程学报, 2008(3): 511-518.
  HUANG Maosong, QIN Huilai, GUO Yuancheng. Upper bound solution for bearing capacity of clay foundation anisotropic and non-homogeneous[J]. Chinese Journal of Rock Mechanics and Engineering, 2008(3): 511-518.
[7] 黄齐武, 黄茂松, 王贵和. 基于下限有限元法的条形浅基础极限承载力分析[J]. 岩土工程学报, 2007(4): 572-579.
  HUANG Qiwu, HUANG Maosong, WANG Guihe. Calculation of bearing capacity of strip footings using lower bound limit method[J]. Chinese Journal of Rock Mechanics and Engineering, 2007(4): 572-579.
[8] GOURVENEC S M, MANA D S K. Undrained vertical bearing capacity factors for shallow foundations[J]. Géotechnique Letters, 2011, 1(4): 101-108.
[9] 罗强, 王恒. 浅基础地基承载力与变形特性离心模型试验研究[J]. 大连理工大学学报, 2015, 55(3): 298-304.
  LUO Qiang, WANG Heng. Experimental study on centrifugal model of bearing capacity and deformation characteristics of shallow foundation[J]. Journal of Dalian University of Technology, 2015, 55(3): 298-304.
[10] BRANSBY M F. The undrained inclined load capacity of shallow foundations after consolidation under vertical loads[C]//8th International Symposium on Numerical Models in Geomechanics, NUMOG 2002. Itay: CRC Press, 2002: 431-437.
[11] ZDRAVKOVIC L, POTTS D M, JACKSON C. Numerical study of the effect of preloading on undrained bearing capacity[J]. International Journal of Geomechanics, 2003, 3(1): 1-10.
[12] GOURVENEC S M, VULPE C, MURTHY T G. A method for predicting the consolidated undrained bearing capacity of shallow foundations[J]. Géotechnique, 2014, 64(3): 215-225.
[13] FU D, GAUDIN C, TIAN C, et al. Effects of preloading with consolidation on undrained bearing capacity of skirted circular footings[J]. Géotechnique, 2015, 65(3): 231-246.
[14] GAONE F M, GOURVENEC S, DOHERTY J P. Large-scale shallow foundation load tests on soft clay—At the National Field Testing Facility (NFTF), Ballina, NSW, Australia[J]. Computers and Geotechnics, 2018, 93: 253-268.
[15] LEHANE B M, JARDINE R J. Effects of long-term pre-loading on the performance of a footing on clay[J]. Géotechnique, 2003, 53(8): 689-695.
[16] WROTH C P. The interpretation of in situ soil tests[J]. Géotechnique, 1984, 34(4): 449-489.
[17] MARTIN C M. Exact bearing capacity calculations using the method of characteristics[C] //Proceedings of 11th International Association for Computer Methods and Advances. Turin, Italy: IACMAG, 2005: 441-450.
[18] 韩冬冬, 谢新宇, 王忠瑾, 等. 条形粗糙基础极限承载力求解与误差分析[J]. 岩土工程学报, 2016, 38(10): 1789-1796.
  HAN Dongdong, XIE Xinyu, WANG Zhongjin, et al. Chinese Journal of Geotechnical Engineering[J], 2016, 38(10): 1789-1796.
[19] GOURVENEC S, RANDOLPH M. Effect of strength non-homogeneity on the shape of failure envelopes for combined loading of strip and circular foundations on clay[J]. Géotechnique, 2003, 53(6): 575-586.
[20] MARTIN C M. New software for rigorous bearing capacity calculations[C]//BGA International Conference on Foundations, Innovations, Observations, Design and Practice. Scotland, UK: Thomas Telford Publishing, 2003: 581-592.
[21] VULPE C, NEWMAN J J. Consolidated undrained capacity of shallow foundations subjected to self-weight and horizontal in-service loading[J]. Géotechnique, 2016, 66(12): 1028-1034.
[22] LI X J, TIAN Y H, GAUDIN C, et al. Comparative study of the compression and uplift of shallow foundations[J]. Computers and Geotechnics, 2015, 69: 38-45.
Options
Outlines

/

〈 〉