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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

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Front. Struct. Civ. Eng.    2016, Vol. 10 Issue (1) : 103-111    https://doi.org/10.1007/s11709-015-0328-4
RESEARCH ARTICLE
A simplified method for the determination of vertically loaded pile-soil interface parameters in layered soil based on FLAC3D
Jiu-jiang WU1,2,Yan LI2,Qian-gong CHENG2,*(),Hua WEN1,Xin LIANG2,3
1. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China
2. Department of Geological Engineering, Southwest Jiaotong University, Chengdu 610031, China
3. Faculty of Civil Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China
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Abstract

The numerical analysis of pile-soil interaction commonly requires a lot of trial works to determine the interface parameters and the accuracy cannot be ensured normally. Considering this, this paper first conducts a sensitivity analysis to figure out the influence of interface parameters on the bearing behavior of a single pile in sand. Then, a simplified method for the determination of pile-soil interface parameters in layered soil is proposed based on the parameter studies. Finally, a filed loading test is used for the validation of the simplified method, and the calculated results agree well with the monitoring data. In general, the simplified method proposed in this paper works with higher accuracy and consumes less time compared with the traditional trial works, especially on the determinations of interfacial cohesive and interfacial friction angle.
Keywords determination of interface parameters      pile-soil interaction      FLAC3D      sensitivity analysis      layered soil     
Corresponding Author(s): Qian-gong CHENG   
Online First Date: 18 December 2015    Issue Date: 19 January 2016
 Cite this article:   
Qian-gong CHENG,Hua WEN,Xin LIANG, et al. A simplified method for the determination of vertically loaded pile-soil interface parameters in layered soil based on FLAC3D[J]. Front. Struct. Civ. Eng., 2016, 10(1): 103-111.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-015-0328-4
https://academic.hep.com.cn/fsce/EN/Y2016/V10/I1/103
Fig.1  Numerical model and interface element. (a) Numerical model; (b) interface element
items ρ/ (kg·m−3) E/MPa K/MPa G/MPa c (kPa) φ/ (°) μ
fine sand Q3al 1900 33 27.5 12.69 2 35 0.2
pile Q3al 2500 3 × 104 1670 1250 − − 0.3
Tab.1  Parameters of pile and soil
Fig.2  Varying curves of f-Δs with different kn. (a) Position of 2-m depth; (b) position of 7-m depth
Fig.3  Varying curves of f-Δs with different ks. (a) Position of 2-m depth; (b) position of 7-m depth
Fig.4  Varying curves of f-Δs with different cc. (a) Position of 2-m depth; (b) position of 7-m depth
Fig.5  Relationship between the ultimate skin friction and the soil pressure under different cc
Fig.6  Varying curves of f-Δs with different φc. (a) Position of 2-m depth; (b) position of 7-m depth
Fig.7  Relationship between the ultimate skin friction and the soil pressure under different φc
Fig.8  The flow chart for the determination of pile-soil interface parameters
Fig.9  Profile of soil layers and test pile
items Poisson’s ratio bulk modulus /MPa shear modulus /MPa cohesive /kPa internal friction angle /(°) density /(kg·m-3)
mucky clay 0.3 5.33 2.46 14 11.5 1670
silty clay 0.4 60.00 12.86 15 22 1980
sandy silt 0.3 35.00 16.15 3 32.5 1870
fine sand 0.3 41.67 19.23 1 33.5 1920
silty sand 0.3 166.67 76.92 2 34 1910
coarse sand 0.3 333.33 153.85 5 32 2020
C50 concrete(pile body) 0.2 19166 14375 − − 2400
Tab.2  Parameters for soil and pile
Fig.10  Distribution of the soil pressure around pile body
items cc/kPa φc/(°)
mucky clay 0 0
silty clay 4 6
sandy silt 1 12
fine sand 1 19
silty sand 1 24
coarse sand 3 23
Tab.3  Initial values of cc and φc in each soil layer
items kn/kPa ks/kPa cc/kPa φc/(°)
mucky clay 246 2.46 0 0
silty clay 1286 30 3.8 6
sandy silt 1615 32.3 1.1 12
fine sand 1923 57.7 1 19.5
silty sand 7692 215 1.45 25
coarse sand 15385 308 3.75 24.5
Tab.4  Determinate values of interface parameters in each soil layer
Fig.11  Comparison of measured and calculated Q-s curves
Fig.12  Measured and calculated f-Δs curves. (a) Measured data; (b) calculated data
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