In order to investigate the settlement characteristics of piled raft foundation in layered clayey ground, based on the practical analysis model of piled raft foundation considering the interactions of pile-raft-soil, the settlement of piled raft foundation in typical double-layer clayey ground is analyzed for an example. The influences of 11 different conditions, including the ultimate bearing capacity of the natural ground, the depth of upper and lower layers and the corresponding strength of the soil, the ultimate bearing capacity of the pile shaft and pile end, the size of the pile foundation and the configuration parameters on the settlement characteristics of the piled raft foundation are analyzed via MATLAB programs. Based on the parametric analysis results, a normalized settlement analysis model for piled raft foundation is proposed, which takes into account the influence of the safety factor of the piled raft foundation. By comparing and analyzing the on-site measured data with a series of pile raft foundation engineering examples, the reliability of the proposed normalized model for pile raft foundation was verified. As the design safety factor increases, the discreteness between the calculated results and values gradually decreases. The proposed normalized settlement model can provide a reference for the analysis of piled raft foundation for the engineers.
Luo Ruping
,
Li Zhidan
,
Zhu Bitang
,
Ding Wenyun
. Normalized Analysis Method of Piled Raft Foundation Settlement in Layered Clay Foundation[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(4)
: 1363
-1372
.
DOI: 10.20174/j.JUSE.2025.04.28
[1] 中华人民共和国住房和城乡建设部. 建筑地基基础设计规范 (GB50007-2011) [S]. 北京: 中国建筑工业出版社, 2012. (Ministry of Housing and Urban-Rural Development of the People's Republic of China. GB50007-2011. National Standard of the People's Republic of China: Code for Design of Building Foundation (GB50007-2011) [S]. Beijing: China Architecture & Building Press, 2012. (in Chinese))
[2]吴海亮,邢琳,张戊晨, 等.非均匀地基变桩长沉降控制三维有限元协同分析[J].建筑结构,2022,52(8):124-130, 65. (Wu Hailiang, Xing Lin, Zhang Wucheng, et al. Three dimensional finite element cooperative analysis of settlement control of variable pile length in non-uniform foundation[J]. Building Structure, 2022, 52(8): 124-130, 65. (in Chinese))
[3]Modak R, Sing B. Numerical study on settlement-dependent variation of raft-soil-pile interactions for large piled raft in clay soil[J]. Ocean Engineering, 2023, 281: 115011.
[4]康承磊,谢淼,韦楷,等.跨座式单轨群桩基础沉降特性研究[J].地下空间与工程学报, 2021, 17(2):405-412. (Kang Chenglei, Xie Miao, Wei Kai, et al. Study on settlement characteristics of straddle monorail pile group foundation [J]. Chinese Journal of Underground Space and Engineering, 2021,17 (2): 405-412. (in Chinese))
[5]杨勇,杨春山,胡会勇,等.多向荷载作用下超大直径群桩基础方案评价[J].地下空间与工程学报, 2023, 19(3): 973-980. (Yang Yong, Yang Chunshan, Hu Huiyong, et al. Evaluation of super large diameter pile group foundation under multi-directional loads[J]. Chinese Journal of Underground Space and Engineering, 2023,19(3): 973-980. (in Chinese))
[6]Bhartiya P, Chakraboety T, Basu D. Settlement estimation of piled rafts for initial design[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2020, 146(2): 04019127.
[7]Basile F. Non-linear analysis of vertically loaded piled rafts[J]. Computers and Geotechnics, 2015,63:73-82.
[8]朱杰江,蔡海.土—桩—筏共同作用的混合分析法[J].地下空间与工程学报, 2009, 5(6):1151-1154, 1160. (Zhu Jiejiang,Cai Hai. A hybrid analytical method for soil-pile-raft interaction[J]. Chinese Journal of Underground Space and Engineering,2009,5(6): 1151-1154, 1160. (in Chinese))
[9]罗如平,杨敏,杨军.刚性筏板下群桩基础共同作用实用分析方法[J].湖南大学学报(自然科学版),2018,45(11):54-61. (Luo Ruoping, Yang Ming, Yang Jun. Practical analysis method on interaction of rigid piled raft foundation[J]. Journal of Hunan University (Natural Sciences),2018,45(11):54-61. (in Chinese))
[10]王凌,罗如平.均质地层中桩筏基础筏板荷载分担比的归一化分析方法[J].土木与环境工程学报(中英文),2020,42(6):38-45. (Wang Ling, Luo Ruoping. Normalized analysis for pile-raft load sharing ratio of piled raft foundation in homogeneous ground[J]. Journal of Civil and Environmental Engineering, 2020, 42(6): 38-45. (in Chinese))
[11]Horikoshi K, Randolph M F. On the definition of raft-soil stiffness ratio for rectangular rafts[J]. Géotechnique, 1997,47(5):1055-1061.
[12]Poulos H G. Piled raft foundations: Design and applications[J]. Geotechnique, 2001,51(2):95-113.
[13]Luo R P, Yang M, Li W C. Normalized settlement of piled raft in homogeneous clay[J]. Computers and Geotechnics, 2018, 103: 165-178.
[14]Kititodom P, Matsumoto T. A simplified analysis method for piled raft foundations in non-homogeneous soils[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2003,27(2):85-109.
[15]Koizumi Y, Ito K. Field tests with regard to pile driving and bearing capacity of piled foundations[J]. Soils and Foundations, 1967, 7(3): 30-53.
[16]Liu J, Huang Q, Li H, et al. Experimental research on bearing behaviour of pile groups in soft soil[A] // International conference on soil mechanics and foundation engineering[C]. 1994: 535-538.
[17]Han J, Ye S. A field study on the behavior of micropiles in clay under compression or tension[J]. Canadian Geotechnical Journal, 2006,43(1):19-29.
[18]江杰, 黄茂松, 李波, 等. 重复加卸载下桩筏基础沉降分析与离心模型试验[J]. 岩土工程学报, 2009,31(12):1811-1817. (Jiang Jie, Huang Maosong, Li Bo, et al. Analysis on settlement of piled raft foundations under repeated loading and verification by centrifugal model tests[J]. Chinese Journal of Geotechnical Engineering, 2009,31(12):1811-1817. (in Chinese))
[19]Alnuaim A M, El Naggar M H, El Naggar H. Performance of micropiled raft in clay subjected to vertical concentrated load: Centrifuge modeling[J]. Canadian Geotechnical Journal, 2015,52(12): 2017-2029.
[20]O'Neill M W. Field study of pile group action: final report, Report FHWA RD-81-002[R]. Washington, D.C: Federal Highway Administration,U.S. Department of Transportation, 1981.
[21]Cairo R,Conte E. Settlement analysis of pile groups in layered soils[J]. Canadian Geotechnical Journal, 2006,43(8):788-801.
[22]Sheil B B, McCabe B A. An analytical approach for the prediction of single pile and pile group behaviour in clay[J]. Computers and Geotechnics, 2016,75:145-158.
[23]Cooke R W. Piled raft foundations on stiff clays-a contribution to design philosophy[J]. Geotechnique, 1986, 36(2): 169-203.
