不同降雨模式下土质路基边坡渗流场研究

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Abstract Research purposes:Rainfall is one of the most important factors for subgrade slope failure, and rainfall patter is one of the most primary influence parameters. Based on the two-dimensional saturated-unsaturated seepage theory, numerical analyses are conducted to investigate the change rules of seepage field in subgrade slope subjected to rainfalls with four different patterns, i.e. delayed, uniform, central and advanced rainfall patterns.Research conclusions:(1) Both the maximum pore-water pressure u_max and the maximum saturated depth H_smax at shoulder are affected by rainfall intensity and rainfall duration observably. (2) There is a sensitive range of coefficient of permeability influencing on the maximum saturated depth, only within the sensitive range increasing coefficient of permeability could reduce H_smax and subgrade surface pore-water pressure effectively. (3) Under central and advanced rainfall patterns, the most dangerous time stage of slope stability is obvious affected by coefficient of permeability, within the sensitive range and the less side outside the sensitive range, the starting point of the most dangerous time stage is not affected by coefficient of permeability, but the end time is advanced with coefficient of permeability increasing. (4) The stability of subgrade slope is the best under advanced rainfall pattern and the worst under delayed rainfall pattern. (5) The research results can provide basis and reference for slope protection and reinforcement design.

Key words： rainfall pattern saturated-unsaturated seepage pore-water pressure saturated depth the most dangerous time stage of slope stability

Received: 18 March 2014

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	XIA Qiong
	DOU Shun
	WANG Xu

Cite this article:

XIA Qiong,DOU Shun,WANG Xu. A Study on Seepage Field in Subgrade Slope Subjected to Various Rainfall Patterns[J]. 铁道工程, 2014, 31(9): 35-39.

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2014/V31/I9/35

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