Moisture Migration Mechanism in Granite Residual Soil Embankment under the Combined Action of Rainfall and Capillary

Abstract:

Taking the granite residual soil embankment of Fujian Province as an example, this paper investigated the moisture migration mechanism in granite residual soil embankment based on the finite difference technology. The results show that the moisture migration of the shallow layer of the embankment displays up first and down later in dry seasons. In rainy seasons, the negative pressure head of the embankment’s upper soil increases, and range of rainfall variation of the initial period is much sharper than the later period. Meanwhile, at the toe of slope, the rain firstly supplies the groundwater, making it a weak location. After the rain, the contour line of negative pressure head in the upper embankment gradually becomes sparse, and the gradient gradually decreases in the embankment. The fluctuation of negative pressure head on foundation surface decreases with the depth of groundwater. As to the low embankment, the change of the embankment moisture mainly depends on the external weather conditions when the groundwater level is deep and the moisture is mainly affected by groundwater when the groundwater level is shallow.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 395-400
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.395
• Online since: November 2012
• Authors: Yun Que, Xiao Qin Yao
• Keywords: Capillary Rise, Combined Action, Granite Residual Soil Embankment, Moisture Migration, Rainfall

References

[1] Yunzhi Tan, Lingwei Kong, Aiguo Guo, etc. Capillary effect of moisture transfer and its numerical simulation of compact ed red clay, Rock and Soil Mechanics, Vol.31(2010), pp.2289-2294.

[2] Jinzhong Chen. Strength and deformation properties of embankment under water capillary, Journal of Shanxi Datong University, Vol.2(2008), pp.53-55.

[3] Lun, Likos W J. Rate of capillary rise in soi, Journal of Geotechnical and Geo-environmental Engineering, Vol.130(2004), pp.646-650.

[4] Ming Yang, Fei Yu. Capillary water upward law and disposal technology of expansive soil subgrade, China Journal of Highway and Transport, Vol.22(2009), pp.26-30.

[5] Rui Li, Wenguang Zhao, Shanxiong Chen. Capillary water upward analysis of expansive soil roadbed based on the geo-slope, Journal of Huazhong Science and Technology University, Vol.23(2006), pp.36-39.

[6] Lim, T.T.; Rahardjo, H.; Chang ,M.F.;etc. Effect of rainfall on matric suctions in a residual soil slope.Canadian.Geotechnical. Journal, Vol.33 (1996), pp.618-628.

DOI: 10.1139/t96-087

[7] Tiexing Wang, Caikun Yue, Jie Lu, etc. Mumerical analysis of moisture migration in Loess subgrade under continuous rainfall. Journal of Architecture and Technology Xi'an University, Vol.39(2007), pp.593-597.

[8] Richards, L.A., Capillary conduction through porous mediums. Physics 1, (1931), pp.313-318.

[9] Yuqun Xue, Chunhong Xie. Numerical Simulation of Groundwater(Science Press, China 2007).