泥石流拦砂坝坝基土颗粒级配对扬压力影响实验研究

doi:10.13722/j.cnki.jrme.2017.0823

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Abstract Grain composition affects the permeability of foundation soils significantly and has considerable impact on the magnitude and distribution of uplift pressure. In order to study the permeability of the foundation soils and the uplift pressure of a check dam，the vertical and horizontal seepage devices were designed and six groups tests were performed on soils of different grain compositions. The relationships between the uplift pressure and the permeability coefficient/fine content of the foundation soils were established. The results show that the foundation soils are most stable when the content of fine particles(＜5 mm) is in the range of . The uplift pressure decreases linearly along the axis of dam base. Besides，the reduction coefficient of uplift pressure has a logarithmic relationship with the permeability coefficient k and has a negative linear correlation with the content of fine particle before the seepage failure. The uplift pressure varies dramatically when the seepage failure occurs.

Key words： engineering geology check dam grain composition foundation soil seepage uplift pressure

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	ZHANG Li1
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	3
	YOU Yong1
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	LIU Jinfeng1
	2
	SUN Hao1
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	3
	LIU Daochuan1
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	3

Cite this article:

ZHANG Li1,2,3, et al. Experimental study on the uplift pressure of a check dam with foundation soils of different grain compositions[J]. , 2018, 37(1): 190-198.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0823 OR http://www.rockmech.org/EN/Y2018/V37/I1/190

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