Study on a Calculation Method of Critical Embankment Height on Natural Soft Foundation Considering the Effect of Crust Layer

Abstract:

Taking into consideration both stress dispersion effect and shear strength of crust layer, based on Flamant formula of polar coordinates representation and Mohr-Coulomb strength criterion, this paper deduces a new formula of critical edge pressure of natural soft foundation considering the realistic coefficient of lateral earth pressure. A calculation method of critical embankment height on natural soft foundation is proposed. The limit value of the result calculated by the new method is also put forward, which can ensure the reliability of the method applied. Additionally, critical embankment height at different thickness of crust layer h2, width of embankment loading B, soft layer soil coefficient of lateral earth pressure K0, crust layer soil coefficient of lateral earth pressure K1 is studied. Researches discover that the change of h2, B and K0 has significant influences on critical embankment height; a calculation result of critical embankment height is significantly partially high when the coefficient of lateral earth pressure is equal to 1 under this assumption.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 202-209
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.202
• Online since: October 2012
• Authors: Fu Zhu, Gao Feng Zhan, Lei Nie
• Keywords: Critical Embankment Height, Flamant Formula, Mohr-Coulomb Strength Criterion, Natural Soft Foundation

References

[1] Leroueil S, Tavenas F, Roy M. Construction pore pressures in clay foundations under embankments. Part I: the Saint-Alban test fills[J]. Canadian Geotechnical Engineering, 1978, 15: 54-65.

DOI: 10.1139/t78-005

[2] Leroueil S, Tavernas F. Construction pore pressures in clay foundations under embankments. Part II: generalized behaviour[J]. Canadian Geotechnical Engineering, 1978, 15: 66-82.

DOI: 10.1139/t78-006

[3] Xiaomou Wang. Calculation of proportional limit load for soft clay foundation involving the effect of dry crust[J]. Chinese Journal of Geotechnical Engineering. 2002, 24(6): 720-723, (in Chinese).

[4] YanxuWen, Jian Zhou, Mincai Jia. Critial edge pressure of soft clay foundation considering closure effect and stress dispersion of crust[J]. Rock and Soil Mechanics. 2007, 28(8): 1715-1718, (in Chinese).

[5] Yunxia Wang. Stress State of the Ground in Site and the Calculation of Lateral Pressure Coefficient K0. Geotecnical Engineering World, 2002, 4(7): 60-62, (in Chinese).

[6] Anlong Jiang, Yuying Guo, Dazhao Gao. The Study on coefficient of Earth Pressure at Rest[J]. Geotechnical Engineering Technique. 2003, 6: 354-359, (in Chinese).

[7] JuyunYuan, Jiangu Qian, Hongming Zhang, Fayun Liang. Soil Properties and Soil Mechanics[M]. Beijing: China Communication Press, 2009, (in Chinese).