Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (4): 43-53.doi: 10.6040/j.issn.1672-3961.0.2021.125

• Civil Engineering • Previous Articles     Next Articles

Distribution law and calculation method of earth pressure in culvert under reinforced embankment

Xiuguang SONG1(),Yimin ZHAO1,2,Hongbo ZHANG1,*(),Zhenyu YANG1,Qiang YANG3   

  1. 1. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China
    2. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China
    3. Jinan Jinqu Road Survey Design Research Co., Ltd., Jinan 250021, Shandong, China
  • Received:2021-03-24 Online:2021-08-20 Published:2021-08-18
  • Contact: Hongbo ZHANG E-mail:songxiuguang@sdu.edu.cn;zhanghongbo@sdu.edu.cn

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Abstract:

Based on the scale model test, the difference settlement between the embankment and the culvert was simulated by changing the foundation compression modulus on both sides of the culvert to reveal the mechanism of reinforcement and subsidence reduction on the culvert roof, determine the distribution law of earth pressure on the culvert roof under the condition of embankment overloading, and deduce and establish the calculation formula of earth pressure.The results showed that the soil pressure at the top of the reinforced embankment was obviously higher than that of the ordinary embankment under the same foundation modulus. The embankment-culvert relative displacement decreased with the increase of the number of grid layers.Under the same reinforcement condition, the smaller the foundation compression modulus was, the higher the embankment-culvert relative displacement and the soil pressure on the culvert top would be.Combined with the soil arching effect and the mechanism of reinforcement and subsidence reduction, the calculation formula of earth pressure under the roof of reinforced embankment was established, and the reliability was verified with the model test results.

Key words: rigid culvert, reinforced embankment, laboratory model test, soil pressure

CLC Number: 

  • TU443

Fig.1

Schematic diagram of model device"

Fig.2

Physical image of model device"

Fig.3

Gradation curve of sand particles"

Table 1

Basic geotechnical parameters of test sand"

D10/mm D30/mm D50/mm D60/mm Cu Cc ρdmax/(g·cm-3) ρdmin/(g·cm-3)
0.16 0.31 0.41 0.46 2.83 1.28 1.72 1.42

Fig.4

The strength curve of direct shear test with sand"

Table 2

Technical indicators of geogrid"

单位长度纵向拉伸屈服强度/(kN·m-1)单位长度横向拉伸屈服强度/(kN·m-1)纵向屈服伸长率/%纵向屈服伸长率/%网孔面积/mm2
25.2 55 25.2 12 1400

Table 3

Parameters of test conditions"

工况 格栅层数 海绵类型
1 0 无
2 0
3 1 55D海绵
4 2
5 0
6 1 45D海绵
7 2
8 0
9 1 25D海绵
10 2

Fig.5

Vertical pressure distribution diagram of cross section under overburden load"

Fig.6

Schematic diagram of the difference in fill settlement"

Fig.7

The distribution law of earth pressure of 55D sponge"

Fig.8

The distribution law of earth pressure of 45D sponge"

Fig.9

The distribution law of earth pressure of 25D sponge"

Fig.10

Relationship between the average earth pressure above the culvert and the height of the fill when the number of different geogrid layers"

Fig.11

Relationship between the earth pressure above the culvert and the height of the fill when the different foundation modulus"

Fig.12

The relationship between the fill settlement and the fill load when the compression modulus of the different foundation"

Fig.13

Force analysis diagram of unit body"

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