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Field experiment of rainfall infiltration on a soil slope and simulations based on a water-air two-phase flow model

Journal of Mountain Science 2021年第8期18卷 2159-2167页

作者： LIU Gang ZHA Xin-yuan GUAN Jin-kun TONG Fu-guo Hubei Key Laboratory of Construction and Management in Hydropower Engineering China Three Gorges UniversityYichang443000China College of Hydraulic&Environment Engineering China Three Gorges UniversityYichang443000China

Rainfall infiltration on a soil slope is usually an unsaturated seepage process that can be described by a water-air two-phase flow *** effect of pore air pressure on rainfall infiltration has been widely recognized and validated by means of numerical simulations and laboratory ***,whether a slope can actually seal pore air continues to be debated by *** this study,a water-air two-phase flow model is used to simulate the rainfall infiltration process on a soil slope,and a field experiment is conducted to realistically test the sealing conditions of a *** to the numerical simulation,the areas of water and air flow in and out on the slope surface are relatively stable and can be classified as the“inhalation zone”and“overflow zone”,*** rainfall on the soil slope has an amplifying effect on pore air pressure because rainfall intensity is usually at the millimeter level,and it causes pore air pressure to reach the cm level.A field experiment was performed to determine whether a slope can realistically seal pore air and subsequently verify the regularity of rainfall *** pressure sensors were buried in the slope to monitor the pore air pressures during the rainfall *** monitoring results show that the pore air pressure in the slope changed,which indicates that the slope can seal ***,the amplification effects of intermittent rainfall on pore air pressure were observed for natural rainfall,which agrees well with the numerical simulation results.

关键词： Rainfall infiltration Runoff regularity Field experiment water-air two-phase flow

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Numerical Simulation of water-air two-phase flow in Soil Slope under water Level Rise Condition

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Wuhan University Journal of Natural Sciences 2009年第5期14卷 442-446页

作者： ZHANG Xiaoyue,ZHU Yueming,FANG Chunhui,CHEN Shoukai College of water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,Jiangsu,China College of water Conservancy and Hydropower Engineering Hohai University Nanjing China

In order to simulate the unsteady seepage in soil slopes under water level rise condition, including water seepage and air seepage, and to investigate the influence of the capillary pressure on the slope safety coefficient, the water-air two-phase flow model was used and its solving method and definition condition were given. By the two-phase flow model, the pore air and pore water seepage of a soil slope under steady seepage and water level rise conditions were shown, and the slope stability in different cases was analyzed from the simulation results. We find that under water level rise condition, the pore air pressure in the unsaturated zone increased evidently and the capillary pressure should be considered while the pore air pressure can be neglected in slope stability analysis.

关键词： water-air two-phase flow water level rise saturated-unsaturated seepage capillary pressure slope stability

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Experimental investigations on characteristics of water-air two-phase flows during water-fillings in undulation pipelines

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Journal of Hydrodynamics 2024年第4期36卷 706-724页

作者： Xue-lin Tang Zong-ku Liu Ling Zhang Xiao-qin Li College of water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for water Supply Network System China Agricultural UniversityBeijing100083China Mingyang Smart Energy Group Limited Zhongshan528400China

Visual and pressurized pipeline systems with single- and multi-undulation layouts were used to study experimentally and analyze theoretically the transient characteristics of water-air two-phase flow during water fillings in undulation pipelines based on the combination action analyses of both the communicating pipe and the gravity of the water-air two-phase flows in the descending pipe. For the single undulation pipeline, the complex two-phase flow-pattern evolutions including full pipe flow and stratified flow for low, medium, high water-filling velocity cases, respectively, lead to a great difference in transient pressure, flow pattern and the water-filling duration. Especially for low and medium water-filling velocity cases, the hydraulic theories related to hydraulic drop and hydraulic jump were employed to investigate the entrapped air pocket evolutions in the descending pipe, and the mechanism of negative pressure at the top of the undulation pipes was analyzed. For the same multi-undulation pipeline, due to the different elevations of the three undulation points along flow direction, namely three different types of pipeline layout, high-medium-low case (high elevation undulation point, medium one, and low one), low-medium-high and high-low-medium ones, their water-filling durations are significantly different, i.e., approximately 80.02 s, 227.34 s and 617.78 s. Meanwhile, there are significant differences in flow patterns in water filling, namely larger entrapped air pockets in three descending pipes for the high-medium-low case, entrapped air pockets in the first two descending pipes and open channel stratified flow in the last one for low-medium-high case, some bubbles in three descending pipes for the high-low-medium case.

关键词： water-filling duration trapped air pockets water-air two-phase flow transient flow flow-pattern evolution multi-undulation pipelines

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THE ROLE FORE air flow IN SOIL SLOPE STABILITY ANALYSIS

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Journal of Hydrodynamics 2009年第5期21卷 640-646页

作者： ZHANG Xiao-yue ZHU Yue-ming FANG Chun-hui College of water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China

In order to investigate the effect of the pore air flow in the soil slope stability analysis, a water-air two-phase flow model, based on the multi-phase flow theory, is proposed and with the model, the water-phase and air-phase seepages of the soil slope in the stable seepage and rainfall situations are simulated. The soil slope safety coefficients are obtained according to the simulated pore air pressure and pore water pressure. The calculation results show that in the stable seepage situation, the influence of the pore air pressure on the soil slope stability can be neglected, while in the rainfall situation, the pore air pressure generated in the unsaturated zone will reduce the safety coefficient, and the larger the distance between the slip surface and the underground water level is, the greater the influence of the pore air pressure on the soil slope stability will be.

关键词： unsaturated soil water-air two-phase flow rainfall slope stability

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A force transfer mechanism for triggering landslides during rainfall infiltration

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Journal of Mountain Science 2018年第11期15卷 2480-2491页

作者： LIU Gang TONG Fu-guo ZHAO Yi-tong TIAN Bin College of Hydraulic & Environment Engineering China Three Gorges University

Shallow slope failures induced by rainfall infiltration occur frequently, and the relevant triggering mechanisms have been widely ***-induced landslides are widely recognized to be caused by increases in soil weight, seepage force and pore water pressure or decreases in soil mechanical properties. However, even when all these factors are considered, some landslides still cannot be explained well. The increased pore water pressure in a slope reduces the effective stress of the soil and may trigger slope failure. Similarly, the pore gas pressure in a slope also reduces the effective stress of the soil but has been neglected in previous studies. As the viscosity of air is nearly negligible when compared with that of water, the pore gas pressure spreads faster, and its influence is wider, which is harmful for the stability of the slope. In this paper, the effects of pore gas pressure are considered in a shallow slope stability analysis, and a self-designed experiment is conducted to validate the force transfer *** simulation results show that the pore gas pressure in the slope increases sharply at different locations under heavy rainfall conditions and that the pore gas pressure causes a rapid decrease in the slope safety factor. Laboratory experimental results show that the pore gas pressure throughout the whole unsaturated zone has the same value, which indicates that the gas pressure could spread quickly to the whole sample.

关键词： Landslide Force transfer mechanism Rainfall infiltration water-air two-phase flow

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