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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.    2018, Vol. 12 Issue (4) : 568-576    https://doi.org/10.1007/s11709-017-0444-4
Research Article
Numerical simulation of compaction parameters for sand-filled embankment using large thickness sand filling technique in Jianghan Plain district
Wentao WANG1, Chongzhi TU2, Rong LUO2()
1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
2. School of Transportation, Wuhan University of Technology, Wuhan 430063, China
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Abstract

The study uses the finite element method to simulate a new technique of highway sand embankment filling in Jianghan Plain district, which can raise the thickness of sand-filled layer from 30 cm to 70 cm and can significantly shorten the construction period based on the guarantee of sand embankment construction quality. After simulating the three compacting proposals carried out on the field test, the study uses COMSOL software to research on the compacting effects of sand-filled layers in larger thicknesses by 22 ton vibratory roller alone, and then to investigate the steady compacting effect of 12 ton vibratory roller. The simulation results indicate that the sand-filled layer thickness of 70 cm is suitable for the new sand filling technique, and the sand-filled embankment project with tight construction period is suggested to choose the 12 ton vibration roller for steady compaction.
Keywords sand embankment      compaction in large thickness      numerical simulation      small size vibratory roller      steady compaction     
Corresponding Author(s): Rong LUO   
Online First Date: 09 January 2018    Issue Date: 20 November 2018
 Cite this article:   
Wentao WANG,Chongzhi TU,Rong LUO. Numerical simulation of compaction parameters for sand-filled embankment using large thickness sand filling technique in Jianghan Plain district[J]. Front. Struct. Civ. Eng., 2018, 12(4): 568-576.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-017-0444-4
https://academic.hep.com.cn/fsce/EN/Y2018/V12/I4/568
Fig.1  Optimized structure of sand-filled embankment
Fig.2  Construction Process of embankment using large thickness sand filling technique
Fig.3  Finite element model of sand-filled layer
sand filling layer thickness (cm) elasticity modulus (MPa) Poisson’s ratio wet density before compacting (g/cm3) maximal dry density (g/cm3) optimum water content (%)
70/80/90/100 39.173 0.3 1.765 1.78 15.8
Tab.1  Sand parameters for finite element model
Roller’s model Roller’s mass (kg) vibratory drum’s mass (kg) vibratory drum’s diameter (m) vibratory drum’s width (m) vibration frequency (Hz) vibration force (kN)
22 ton 22000 11000 1.6 2.13 29/35 390/258
12 ton 12000 7000 1.5 2.13 32/36 280/178
Tab.2  Parameters of single-drum vibratory rollers
Proposal 1 Static compaction 1st Weak vibratory compaction 1st Strong vibratory compaction 1st Strong vibratory compaction 2nd Strong vibratory compaction 3rd Strong vibratory compaction 4th
Field test 88.2 88.9 90.7 92.7 92.9 93.2
Simulation 86.3 87.1 88.5 89.8 91.3 92.8
Proposal 2 Static compaction 1st Weak vibratory compaction 1st & 2nd Strong vibratory compaction 1st Strong vibratory compaction 2nd Strong vibratory compaction 3rd Strong vibratory compaction 4th
Field test 88.2 89.2 91.5 93.0 93.2 93.5
Simulation 86.3 88.0 89.3 90.7 92.2 93.7
Proposal 3 Static compaction 1st Weak vibratory compaction 1st & 2nd Weak vibratory compaction 3rd Weak vibratory compaction 4th Weak vibratory compaction 5th Weak vibratory compaction 6th
Field test 88.3 90.4 90.8 91.6 91.7 91.9
Simulation 86.3 88.0 88.8 89.7 90.5 91.4
Tab.3  Simulated compaction degrees of three compacting proposals carried out on the field test (%)
Fig.4  Compaction degrees in different thicknesses of sand-filled layers
Roller’s model 12 ton 22 ton
Proposal 4 Weak vibratory compaction 1st Strong vibratory compaction 1st Strong vibratory compaction 4 times -
Compaction degree 86.2 87.0 92.6 -
Proposal 5 Weak vibratory compaction 1st Strong vibratory compaction 1st & 2nd Strong vibratory compaction 4 times -
Compaction degree 86.2 87.9 93.6 -
Proposal 6 Weak vibratory compaction 1st Strong vibratory compaction 1st Weak vibratory compaction 1st Strong vibratory compaction 4 times
Compaction degree 86.2 87.0 87.9 93.6
Proposal 7 Weak vibratory compaction 1st Strong vibratory compaction 1st Weak vibratory compaction 1st & 2nd Strong vibratory compaction 4 times
Compaction degree 86.2 87.0 88.7 94.5
Tab.4  Simulated compaction degrees of 70 cm sand filling thickness using 12 ton vibratory roller for steady compaction (%)
Fig.5  Vibratory roller of 22 ton was stuck in wet sand when compacting
compared items traditional technique proposed technique
thickness per layer (cm) 30 70
number of layers 20 9
time consumption of construction processes per layer (days)
transportation 2 3
paving 2 3
watering 2 2
compaction 1 1
total per layer 7 9
total construction period (days) 140 81
sand-filled quantity per layer (m3) 880.5 2054.5
paving cost
bulldozer 1533 yuan/1000 m3
loader 985 yuan/1000 m3
cost per layer (yuan) 2217.1 5173.2
total construction cost (yuan) 44342.0 44334.6
Tab.5  Economic analysis and comparison between large thickness sand filling technique and traditional sand filling technique
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