| 摘要(英) |
This study performs experimental work with cylinders on the conveyor belt to simulate the initial process of landslide induced debris flow.The experimental set up consists of three parts: microscopic overturn deformation and macroscopic fluidization.
The kinetic of angular velocity and displacement of the overturn process on the top layer of the cylinders is studied. The change of porosity before and after the overturn is analyzed at different velocities (i.e. 5.08cm/s, 10.16cm/s,15.24 cm/s,20.32 cm/s), and slopes (i.e. 0°, 5°, 10°,15°, 20°),respectively.
The particle image algorithm is used to study the deformation on the bottom of the assemble cylinders by shearing force. The change of porosity before and after the failure is analyzed at different velocities (i.e. 4.17cm/s, 12.34cm/s), and slopes (i.e. 0°, 20°). We establish a method to measure the deformation, angular velocity and porosity of particles. The experimental results show that region of the shearing zone increases as the velocity of the conveyor belt, increases.
Different belt velocities (i.e. 4.17cm/s, 12.34cm/s) affect the thickness of fluidization, and lead to two opposite results on the decay rate of PVC, and steel layers under the same experimental conditions. The sequence of cylinders flowing out the confined zone is strongly related to the gap clearance. When the gap is raised, the leading side of cylinders will flow out first while the gap becomes low, the tailing side and bottom parts of cylinders will flow out first. |
| 參考文獻 |
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