坡体充气过程中气水两相流数值模拟

doi:10.13722/j.cnki.jrme.2015.1643

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Abstract Based on the multi-phase porous flow theory and unsaturated soil theory，a new method was proposed to improve the stability of the slope. In this method，through filling the trailing edge of potential landslide area with compressed air，an unsaturated belt was formed. By cutting off water in seepage path，the underground water level was artificially lowered. To enhance the theoretical research，a two dimensional finite element model was employed to investigate the characteristics of air-water two-phase flow and study the law of groundwater level variation in unsaturated zone during the process of aeration. The results illustrate that it is feasible to intercept water with compressed air in a slope. An analysis on the expansion process in unsaturated zone indicates that the process of intercepting water can be divided into three stages：(1) The unsaturated zone near aeration point is formed and start to expand；(2) As the unsaturated zone extends over underground water level，an unstable two-phase flow is formed；(3) The unsaturated zone expansion is terminated and water intercepting method works smoothly. In the unsaturated zone，it is found that the pore-air pressure，pore-air velocity，pore-water velocity and volumetric water content fluctuate locally and these variations are related intimately. As the pore-air pressure increases with the time，the pore-air velocity increases while the pore-water velocity and volumetric water content decrease，and vice versa. This phenomenon can be ascribed to the interaction and lag between air and water.

Key words： numerical simulation landslide unsaturation intercepting water with compressed air air-water two-phase flow

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	Articles by authors
	YU Wenfei1
	SUN Hongyue1
	SHANG Yuequan2
	MEI Cheng1

Cite this article:

YU Wenfei1,SUN Hongyue1,SHANG Yuequan2, et al. Numerical simulation of air-water two-phase flow in inflatable slope[J]. , 2016, 35(S2): 3597-3604.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1643 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3597

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