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NUMERICAL ANALYSIS OF THE RESPONSE OF PILE-RAFT SYSTEMS CONSIDERING THE APPLICATION OF CEMENT AND POLYPROPYLENE FIBER TREATMENT

Ali HASANZADEH
Ali HASANZADEH
   | 18. Okt. 2019
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Article Category: research-article
Online veröffentlicht: 18. Okt. 2019
Seitenbereich: 81 - 92
Eingereicht: 20. Feb. 2018
Akzeptiert: 22. Mai 2019
DOI: https://doi.org/10.21307/acee-2019-038
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© 2019 Ali HASANZADEH et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Stabilized soil blocks division
Stabilized soil blocks division

Figure 2.

Typical 3D FE mesh of the one-quarter model
Typical 3D FE mesh of the one-quarter model

Figure 3.

Soil, pile-raft material properties and load configuration for validation [30]
Soil, pile-raft material properties and load configuration for validation [30]

Figure 4.

Comparison of the load-settlement curves from different analysis methods
Comparison of the load-settlement curves from different analysis methods

Figure 5.

The variation of maximum settlement of pile-raft with the width of reinforced block
The variation of maximum settlement of pile-raft with the width of reinforced block

Figure 6.

The variation of maximum settlement of pile-raft with the width of stabilized block
The variation of maximum settlement of pile-raft with the width of stabilized block

Figure 7.

The variation of maximum settlement of pile-raft with the depth of reinforced block
The variation of maximum settlement of pile-raft with the depth of reinforced block

Figure 8.

The effect of pile spacing on the differential settlement (between the corner and center of raft) of pile-raft system
The effect of pile spacing on the differential settlement (between the corner and center of raft) of pile-raft system

Figure 9.

The effect of the number of piles on the maximum bending moment of the foundation for various amounts of cement content
The effect of the number of piles on the maximum bending moment of the foundation for various amounts of cement content

Figure 10.

The influence of pile length and reinforced soil block dimensions on the resulting maximum bending moment at the center of raft surface
The influence of pile length and reinforced soil block dimensions on the resulting maximum bending moment at the center of raft surface

Figure 11.

The variation of pile-raft maximum settlement with cement content for various pile lengths and block sizes
The variation of pile-raft maximum settlement with cement content for various pile lengths and block sizes

Figure 12.

The relationship between the (a) maximum (b) differential settlement (between the corner and center of the raft) of pile-raft and fiber content
The relationship between the (a) maximum (b) differential settlement (between the corner and center of the raft) of pile-raft and fiber content

Figure 13.

The combined effect of adding fibers and cement on the maximum and differential settlement (between the corner and center of the raft) of the foundation for (a) 5% cement and (b) 8% cement
The combined effect of adding fibers and cement on the maximum and differential settlement (between the corner and center of the raft) of the foundation for (a) 5% cement and (b) 8% cement

Material properties of different cases considered in this study [18]

Sample no. Cement content (%) Fiber content (%) Modulus of elasticity E (MPa) Poisson’s ratio Unit weight (kN/m3) Cohesion c (kPa) Angle of internal friction ϕ (degrees)
1 0 0 5.8 0.2 16.7 75.1 27.3
2 0 0.05 5.6 0.2 16.7 95.3 28.2
3 0 0.15 5.5 0.2 16.7 102.5 30.1
4 0 0.25 5.3 0.2 16.7 114.3 31.6
5 5 0 39.5 0.3 16.7 152.1 34.2
6 8 0 50.7 0.3 16.7 171.8 35.3
7 5 0.05 39.2 0.3 16.7 169.4 35.1
8 5 0.15 38.8 0.3 16.7 186.7 36.3
9 5 0.25 38.5 0.3 16.7 193.4 36.7
10 8 0.05 50.4 0.3 16.7 181.4 37.0
11 8 0.15 49.9 0.3 16.7 193.3 37.5
12 8 0.25 49.3 0.3 16.7 229.8 39.3

Comparison of the settlement from centrifuge test [33] and present study

Model Average settlement (mm) Load taken by piles (%)
Horikoshi and Randolph [33] 22 19
Present study 21 20

Index and strength parameters of PP-fiber [18]

Behavior parameters Values
Fiber type Single fiber
Unit weight 0.91 g/cm3
Average diameter 0.034 mm
Average length 12 mm
Breaking tensile strength 350 MPa
Modulus of elasticity 3500 MPa
Fusion point 165°C
Burning point 590°C
Acid and alkali resistance Very good
Dispersibility Excellent

Material properties of Nanjing soil [18]

Soil properties Values
USCS Classification CL
Specific gravity 2.7
Liquid limit 36.4%
Plasticity index 17.8%
Optimum moisture content 16.5%
Maximum dry density 1.7 g/cm3
D60 0.0117 mm
D30 0.0048 mm
D10 0.0011 mm
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