Analysis of Soil Arch under Dynamic Load

Abstract:

Aroused by the differential stiffness of pile and soil, the upper load on subgrade is apt to be transferred to pile rather than soil among piles in pile supported embankment(soil arching effect), which optimizes the load-transfer path and effectively limits total settlement of the subgrade. In this paper the properties of soil arch under dynamic load have been investigated by performing numerical studies using the Finite Element Method. The influence of stiffness difference between soil and pile on the soil arch is also proposed in this paper. According to the calculation results, the softer the soil between piles is, the larger proportion of load imposes on pile. Dynamic load has negative effects on the static soil arch, but it does not ruin the shape of the arch. Simultaneously, the larger N (the ratio of dynamic modulus of pile to that of soil)is, the weaker the negative effects of dynamic load on static soil arch are. The static soil arch (soil arch formed when the model only bears static load) has optimized the load transformation path, leading more load undertaken by the pile. Besides, When the stiffness difference between pile and soil among piles is relatively small, the height of soil arch increases sharply with the decrease of N; while when the stiffness difference reaches some certain value, the further increasing of N has little influence on soil arch’s height.

• Periodical: Applied Mechanics and Materials (Volumes 193-194)
• Pages: 939-948
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.193-194.939
• Online since: August 2012
• Authors: Mei Fang Li, Quan Mei Gong, Shun Hua Zhou
• Keywords: Pile-Soil Relative Displacement, Pile-Soil Stress Ratio, Soil Arch

References

[1] Mingli Yan, Donggang Zhan, et al. China Water Conservancy and Hydropower Press, 2001, pp.33-35 (In Chinese).

[2] Binglong Wang, Longcai Yang, etc. China Railway Publishing House, 2007, pp.86-91 (In Chinese).

[3] Linrong Xu, Jiandong Niu, Dawei Lv, Shaofu Gu, Tao Chen. Rock and Soil Mechanics, Vol. 28 (2007), pp.2149-2160 (In Chinese).

[4] Degou Cai, Yangsheng Ye, Hongye Yan, Qianli Zhang, Huawu He: China Railway Science, Vol. 31 (2010), pp.1-7 (In Chinese).

[5] Yunmin Chen, Ning Jia, Renpeng Chen: China Journal of Highway and Transport, Vol. 17 (2003), pp.1-6 (In Chinese).

[6] Yifeng Hu, Nufang Li. Theory of Ballastless Track-Subgrade for High Speed Railway [M]. China Railway Publishing House, (2010), p.228 (In Chinese).

[7] Shaohe Li, Facheng Yi, Diangang Wang. Journal of Geotechnical Engineering Technique, Vol. 1 (2005), pp.50-52 (In Chinese).

[8] Feng Gao: Southwest Jiaotong University, 2003, pp.31-35 (In Chinese).

[9] Huihong Zhong, Maosong Huang, Shiming Wu, Yijing Zhang. Chinese Journal of Geotechnical Engineering, Vol. 24 (2002), pp.629-632 (In Chinese).