基于水气二相流的边坡降雨入渗有限元分析

发布时间：2018-03-23 13:22

本文选题：水气二相流　切入点：降雨入渗　出处：《长江科学院院报》2017年01期

【摘要】：为揭示边坡降雨入渗基本规律,基于水气二相流理论,以三峡库区大坪滑坡为例,采用有限单元法分析边坡降雨入渗水气运动规律。结果表明:根据水气流入、流出的方向不同,坡表可分为吸入区和溢出区,通常坡体上部为水、气吸入区,下部为水、气溢出区;水、气进出坡表的总速率受降雨特性、坡面产流情况、气温变化等外在因素的影响较小,具有相对稳定性;在坡表吸入区,当降雨强度大于水气入渗总速率时,入渗强度等于水气入渗总速率,吸入区产流;反之,入渗强度等于降雨强度,吸入区不产流。此外,坡表饱和区水压力可通过孔隙气传递到地下水面,增大地下水的压力水头,不利于坡体稳定。
[Abstract]:In order to reveal the basic law of slope rainfall infiltration, taking the Daping landslide in the three Gorges Reservoir area as an example, based on the two-phase flow theory of water and gas, the law of rainfall infiltration water vapor movement of slope is analyzed by using finite element method. The results show that: according to the inflow of water and gas, The flow direction is different, the slope surface can be divided into suction area and overflow area, usually the upper part of the slope is water, the air suction area, the lower part is water, the air overflow area, the total rate of water and gas entering and leaving the slope table is affected by the characteristics of rainfall, and the runoff is produced on the slope surface. In the slope surface suction area, when rainfall intensity is greater than the total rate of water vapor infiltration, the infiltration intensity is equal to the total water vapor infiltration rate, and the suction area produces runoff, while the influence of external factors such as air temperature change is relatively small, while in the slope surface suction area, the infiltration intensity is equal to the total water vapor infiltration rate. The infiltration intensity is equal to the rainfall intensity, and no runoff is produced in the suction area. In addition, the water pressure in the saturated area of the slope surface can be transferred to the underground surface through pore gas, which increases the pressure head of the groundwater and is not conducive to the stability of the slope body.
【作者单位】：三峡大学水利与环境学院;湖北省水利水电规划勘测设计院;
【基金】：国家自然科学基金项目(51279090)
【分类号】：TU43

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