Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (3): 917-924.doi: 10.13229/j.cnki.jdxbgxb20200171

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Mechanical properties of new prefabricated box culvert structure based on road conditions in Jilin Province

Ya-feng GONG(),Yun-ze PANG,Bo WANG,Guo-jin TAN(),Hai-peng BI   

  1. College of Transportation，Jilin University，Changchun 130022，China
  • Received:2020-03-18 Online:2021-05-01 Published:2021-05-07
  • Contact: Guo-jin TAN E-mail:gongyf@jlu.edu.cn;tgj@jlu.edu.cn

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Abstract:

The combined prefabricated box culvert with four members is a new type of culvert structure. Based on the construction project of the new expressway between Songyuan and Tongyu section of Tieke expressway in Jilin Province， the field test of the new culvert structure is carried out， and the stress and deformation characteristics of the structure during the construction of different layers are analyzed. The finite element model of culvert-soil structure is established. The theoretical and measured results are compared to verify the correctness of the model. The results show that with the continuous increase of the layered filling height， the upper roof continuously recedes and the left and right side walls continuously protrude， and the selection of backfill soil with large elastic modulus in the backfilling process has a positive impact on the stress and deformation performance of the box culvert. The influence of vehicle live load on bearing deformation of culvert decreases with the increase in the filling height.

Key words: road engineering, prefabricated box culvert, field test, numerical simulation, vehicle live load

CLC Number: 

  • U449.1

Fig.1

Site drawing of prefabricated box culvert"

Fig.2

Layout of measuring points ofprefabricated box culvert"

Fig.3

Layout of prefabricated boxculvert test instrument"

Fig.4

Field test process chart"

Fig.5

Vertical deformation diagram of eachmeasuring point of upper roof"

Fig.6

Lateral deformation diagram of eachmeasuring point of side wall"

Fig.7

Strain diagram of each measuringpoint of upper roof"

Fig.8

Strain diagram of each measuringpoint of side wall"

Fig.9

Finite element model of prefabricatedbox culvert"

Fig.10

Deformation comparison diagram of upper roof"

Fig.11

Strain contrast diagram"

Fig.12

Relationship between elastic modulus of soil and deformation of culvert body and the first principal tensile stress"

Fig.13

Relationship between elastic modulus of soil and deformation of culvert body and the first principal tensile stress when filling 5.9 m"

Fig.14

Relationship between elastic modulus of soil and deformation of culvert body and the first principal tensile stress when filling 6.9 m"

Fig.15

Diagram of relationship between fill height, culvert deformation and the first principaltensile stress under load"

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