›› 2015, Vol. 36 ›› Issue (S1): 646-650.doi: 10.16285/j.rsm.2015.S1.113

• Numerical Analysis • Previous Articles     Next Articles

Discrete element analysis of development and load-transfer mechanism of soil arching within piled embankment

LAI Han-jiang1, ZHENG Jun-jie1, ZHANG Rong-jun1, ZHANG Jun2, CUI Ming-juan1   

  1. 1. Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; 2. Key Laboratory of Highway Construction & Maintenance Technology in Loess Region, Shanxi Transportation Research Institute, Taiyuan, Shanxi 030006, China
  • Received:2015-03-10 Online:2015-07-11 Published:2018-06-14

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Abstract: Soil arching effect is a key factor for the load transfer in a piled embankment. Based on the previous model test, a DEM model of a piled embankment is conducted by the PFC2D. The development of soil arching with the pile-subsoil relative displacement is analyzed based on the deflection of principal stress direction. Then, a soil arching model with a reasonable arch axis is proposed to depict the soil arching in a piled embankment. Meanwhile, a load-transfer coefficient α is introduced for the quantitative analysis of load transfer between the soil arching and the embankment fill below the arching. Numerical results indicate that the pile-subsoil relative displacement will induce the deflection of principal stress direction, which forms the soil arching in embankment. The features and heights of soil arching are related to the pile-subsoil relative displacement, and the maximum soil arching height is about 0.8 times of clear pile spacing. The decrease in α with the increase of soil arching height is found to follow a logarithmic relation.

Key words: piled embankment, soil arching, stress-deflection, reasonable arch axis, load transfer coefficient

CLC Number: 

  • TU 473
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