| Citation: |
ZENG Lei, ZHAO Guizhang. Groundwater response of loess slope during seasonal freeze-thaw process[J]. Geological Bulletin of China, 2022, 41(7): 1300-1307. doi: 10.12097/j.issn.1671-2552.2022.07.016
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Groundwater response of loess slope during seasonal freeze-thaw process
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Abstract
Freeze thaw geological hazards are one of the main forms of geological disasters in the Loess Plateau.Groundwater changes are the main driving factors of geological disasters in the process of seasonal freezing and thawing.In this paper, the response process of groundwater in Loess Slope during seasonal freeze-thaw process was studied by field monitoring and indoor simulation.Based on the numerical model of groundwater response in Loess Slope during seasonal freeze-thaw process, the variation law of water movement and spillover of loess slope during seasonal freeze-thaw process was simulated.The results show that in the early stage of freezing, the overflow amount of groundwater in the overflow zone decreases, and the groundwater level at the foot of the slope rises slightly, with an amplitude of about 1.5m; in the freezing period, the frozen depth of loess slope expands, the overflow zone is partially blocked, and the groundwater level rises at the foot of the slope, and the maximum groundwater level at the foot of the slope rises to 8.18m, and the saturated area continues to expand; in the thawing period, the overflow zone gradually recovers to discharge and the slope is straightened The groundwater level of the slope toe decreased significantly, and the saturation area narrowed, and finally recovered to the level before freezing.By simulating the whole process of groundwater response in the process of seasonal freeze-thaw on loess slope, this paper provides scientific basis for studying the instability mechanism of seasonal freeze-thaw landslide.
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Keywords:
- seasonal freeze-thaw /
- loess slope /
- groundwater /
- numerical simulation
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References
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ZENG Lei, ZHAO Guizhang. Groundwater response of loess slope during seasonal freeze-thaw process[J]. Geological Bulletin of China, 2022, 41(7): 1300-1307. doi: 10.12097/j.issn.1671-2552.2022.07.016
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Figure 1.
Schematic diagram of hydrogeological section of South - North of Heifangtai
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Figure 2.
The diagrammatic cross-section and real photo of typical site
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Figure 3.
Two dimensional conceptual model of water movement in vadose zone profile
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Figure 4.
Schematic diagram of section triangulation
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Figure 5.
Schematic diagram of initial conditions of hydrogeological conceptual model
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Figure 6.
Layout of observation holes
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Figure 7.
Dynamic fitting diagram of underground water level of observation hole
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Figure 8.
Dynamic fitting diagram of groundwater level at slope toe
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Figure 9.
Groundwater flow direction of slope during seasonal freeze-thaw process
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Figure 10.
Velocity chart of groundwater in slope during seasonal freezing and thawing
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Figure 11.
Distribution of initial water content of the model
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Figure 12.
Water content distribution of slope on December 17, 2012
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Figure 13.
Distribution of slope saturation area during freezing period
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Figure 14.
Distribution of saturated area in the melting period
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Figure 15.
Dynamic diagram of groundwater level of slope during seasonal freeze-thaw process
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Figure 16.
Variation of overflow zone range with time
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Figure 17.
Variation of overflow volume with time