| Citation: |
ZHANG Zhidong, FAN Xiaoyi, JIANG Yuanjun. Particle sequence distribution and the effect of particle size on the impact effect in a fluidized landslide-debris flow[J]. Hydrogeology & Engineering Geology, 2021, 48(1): 49-59. doi: 10.16030/j.cnki.issn.1000-3665.202001005
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Particle sequence distribution and the effect of particle size on the impact effect in a fluidized landslide-debris flow
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Abstract
The severity of a landslide-debris flow is determined by such factors as the speed, deposition morphology and impact force of the sliding body. Differences in the lithological characteristics and structural distribution of the sliding source area lead to differences in the particle order distribution and particle size of the sliding body. During the movement, the collision, friction, and jumping between the particles affect the degree of hazard of the landslide-debris flow. Based on the physical model test, the dimensional discrete element software PFC3D is used to explore the influence of the particle order distribution and particle size on the speed, stacking morphology and impact force. The results show that the average velocity of particles in the debris flow is affected by both the particle size and the initial particle order in the slip source region, and the initial particle order has a greater effect on the average velocity of particles. The particle size has a greater effect on the particle order arrangement in the thickness direction, while the particle order distribution in the slip source area has a greater effect on the deposition morphology. Under the effect of particle-size segregation, the particle size becomes the main factor controlling the peak impact force and the slip source. The particle sequence distribution in the slip source area determines the accumulation morphology, which controls the impact force of the debris flow in the quasi-static accumulation stage.
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Keywords:
- landslide-debris flow /
- particle order distribution /
- particle-size /
- impact force /
- PFC3D
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References
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ZHANG Zhidong, FAN Xiaoyi, JIANG Yuanjun. Particle sequence distribution and the effect of particle size on the impact effect in a fluidized landslide-debris flow[J]. Hydrogeology & Engineering Geology, 2021, 48(1): 49-59. doi: 10.16030/j.cnki.issn.1000-3665.202001005
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Figure 1.
Sketch of the flume model (mm)
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Figure 2.
Different lithologies in the slip source area
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Figure 3.
Grain order distribution of the primary deposits under different working conditions
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Figure 4.
Curve of gradaton of the samples
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Figure 5.
Grain material of the M2 grade
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Figure 6.
Comparison of the deposition forms between the numerical simulation and model test under different slopes
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Figure 7.
Comparison of impact force between the numerical simulation and model test under different slopes
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Figure 8.
Time-history curve of the average speed of particles with different particle sizes under the MIX conditions
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Figure 9.
Movement comparison at different moments under the MIX conditions
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Figure 10.
Curve of the average speed vs time of three kinds of particles under different working conditions
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Figure 11.
Deposit shape of the sample under the (a) MLS and (b) MSL working conditions
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Figure 12.
Deposit shape of the three groups of different particles under different working conditions when the single particles close to (a) the surface and (b) the bottom of the initial accumulation body
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Figure 13.
Time-history curves of the impact force under various working conditions during the impact retaining wall
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Figure 14.
Schematic diagram of the impact force at different stages
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Figure 15.
Time-history curves of the impact force of three kinds of particles under different working conditions