| China Geological Environment Monitoring Institute, China Geological Disaster Prevention Engineering Industry Association | Host |
| Citation: |
HU Hua, WU Xuan, ZHANG Yue. Experimental study on slope collapse characteristics of granite residual soil slope under heavy rainfall[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(5): 92-97. doi: 10.16031/j.cnki.issn.1003-8035.2021.05-11
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Experimental study on slope collapse characteristics of granite residual soil slope under heavy rainfall
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Abstract
The granite residual soil in southeast coast area is selected as the representative soil sample and the simulation test schemes of rainfall triggered landslide are designed with the slope gradient and the rainfall intensity as their control variables. Then the heavy rainfall simulation experiment of slope models with four different gradients are performed under four kinds of different conditions, i.e. heavy rain, rainstorm, heavy rainstorm, extreme rainstorm, and the influence characteristics of rainfall intensity and slope gradient on slope slumping destruction are studied. The results show that the greater rainfall intensity is, the larger the slide block size of collapse is and the more concentrated the scope of damage is, while more obvious the trend of deep or shallow overall damage of slope. In addition, the extent of slope damage is enhanced and the less time needed for soil cracks appear and slope slumping destruction at the same time. With the slope gradient increases, the failure modes of slope gradually become scattered collapse from landslide sliding and the rainfall duration of slope sliding damage is reduced. The research results have important theoretical and practical significance for disclosing the rule of residual soil landslides and other geological disasters triggered by heavy rainfall.
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Keywords:
- granite residual soil /
- simulation experiment /
- slope model /
- rainfall intensity /
- slope gradient
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References
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HU Hua, WU Xuan, ZHANG Yue. Experimental study on slope collapse characteristics of granite residual soil slope under heavy rainfall[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(5): 92-97. doi: 10.16031/j.cnki.issn.1003-8035.2021.05-11
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Figure 1.
Layout of simulated rainfall device and the fixed-point (i.e. Top, middle, bottom) observation box of slope side
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Figure 2.
Failure cracks and morphology appeared in the shallow layer of slope body
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Figure 4.
The shape of slope block after collapse failure
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Figure 5.
Failure pattern of overall collapse and instability of deep slope
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Figure 3.
Local block collapse form in shallow layer of slope
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Figure 6.
The curve of the slope gradient and the time of the slope sliding under four kinds of different gradient conditions
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Figure 7.
The curve of the slope gradient and the time of the slope sliding damage under four kinds of different rainfall intensity conditions