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| Titel |
A simulation of rainfall infiltration based on two-phase flow |
| VerfasserIn |
Jun Wang, Niannian Xi, Gang Liu, Shuang Hao |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127485
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| Publikation (Nr.) |
 EGU/EGU2016-7367.pdf |
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| Zusammenfassung |
| Rainfall infiltration in slope usually is one of major reasons cause landslide, which involves
multiphase flow coupling with soil, water and gas. In order to study the mechanism
of landslide caused by rainfall infiltration, a simulation of rainfall infiltration of
DaPing slope, which locates in the Three Gorges Region of China, is presented
based on the numerical solution of governing equations of two-phase flow in this
paper.
The results of this research suggest that there are two sections can be divided in the
surface of slope, one is inflow area and the other is overflow area, according to where it is
infiltration and discharge. The general inflow area is on the upside of slope, while the
overflow area is on the underside. The middle section of slope is on a fluctuant position
between inflow and overflow area, which is dramatically affected by the water content inside
of slope. Moreover, the average rate of infiltration is more stable in both inflow and overflow
area, whose numerical value is depend on the geometry and transmission characteristics
of slope. And the factors of rainfall characteristics, surface flow and temperature
have little effect on them. Furthermore, in the inflow area, when rainfall intensity
is higher than infiltration the rain on the surface of slope will run off, otherwise
water and gas will completely infiltrate through soil. The situation is different in the
overflow area whose overland flow condition is depended on whether it is saturated or
not inside of slope. When it is saturated in the slope, there is no infiltration in the
overflow area. But when it is unsaturated, the infiltration intensity will equal to rainfall
intensity.
In a summary, the difference from inflow and overflow area is the evidence that the
landslide may likely to happen on the slope of overflow area when it comes to a rainfall. It is
disadvantageous for slope stability when transmitting the pressure of saturated water weight
at the top of slope through the pore gas to groundwater, the groundwater pressure will
increased sharply. |
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