Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (6): 1730-1737.doi: 10.13229/j.cnki.jdxbgxb.20221067

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Stress features of piles-soils in load transfer of high-strength grid pile-net foundation

Gen-she YU1,2(),Yong-hui SHANG3(),Lin-rong XU1,4   

  1. 1.School of Civil Engineering，Central South University，Changsha 410075，China
    2.CCCC Mechanical and Electrical Engineering Bureau Co. ，Ltd. ，Beijing 100088 China
    3.Institute of Architecture and Engineering，Huanghuai University，Zhumadian 463000，China
    4.National Engineering Laboratory for High Speed Railway Construction，Changsha 410075，China
  • Received:2022-08-25 Online:2024-06-01 Published:2024-07-23
  • Contact: Yong-hui SHANG E-mail:yuer19213@163.com;syhbsh@csu.edu.com

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Abstract:

In order to reveal in depth the pile-soil stress transfer features of the upper embankment load transfer process of the high-strength grid pile-net composite foundation， relying on the background of the high-strength grid pile-net composite foundation engineering of a high-speed railway， a modified soil arch model suitable for the analysis of load transfer characteristics of small pile-soil differential settlement pile-net composite foundation was established， and the theoretically calculated pile-soil stress was compared with field test results to verify the rationality of the modified model. The results show that the revised model highly matches the field test results in calculating the pile-soil stress ratio， verifying the reliability of the model. Under the same conditions， the influence range of the soil arching effect decreases with the increase of the filling height， and the characteristic value of the tensile film increases exponentially with the increase of the pile-soil differential settlement. Under the effect of high-strength grille "pulling membrane to stand"， the pile-soil cooperative effect is basically completed during the filling period， and the rang of pile-soil stress ratio is 3.8~4.0 when it is stable. At the same time， by comparing the change rule of pile-soil stress ratio and settlement with the filling load， it can be seen that the former is slightly more sensitive to the filling load than the settlement， which shows that the pile-soil stress ratio can also be used to evaluate the effect of controlling the settlement of high railway foundation. The research results can provide theoretical basis for the fine construction of pile-net composite foundation of high-speed railway.

Key words: high-strength grille, pile-soil stress, pile-net foundation, load transfer, high-speed railway

CLC Number: 

  • TU470

Fig.1

Modified soil arch model"

Fig.2

Analysis model of film pulling effect"

Table 1

Physical and mechanical parameters of soil layer"

参数黏土粉质黏土中砂砾砂
厚度/m1.27.52.0>20
重度/（kN?m -3 ）16.819.320.520.2
弹模/MPa7832.235.5
泊松比0.350.350.280.29
黏聚力/kPa15203.51.5
摩擦角/（°）12153335
测压系数0.550.550.450.4

Fig.3

Structural layout and test diagram of pile net composite foundation"

Table 2

Theoretical calculation parameters"

类别计算参数
路堤填土

h=7.8 m； c=10 kPa； φ=30°；

Es=E0=10 MPa； γ=20 kN/m3

CFG桩d=0.5 m； B=1.0 m；
土工格栅Eg=300 kN/m

Fig.4

Vertical earth pressure distribution along depth"

Fig.5

Effect of differential settlement on soil arch height"

Fig.6

Earth pressure test curve"

Fig.7

Comparison of test and calculation results"

Fig.8

Settlement test curve"

Fig.9

Comparison of pile soil stress ratio and settlement"

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