Abstract
This paper describes an experimental work in order to assess the efficiency of slit dam on non-viscous debris flow. Some results have been acquired as follow: ① there are three kinds of blocking type: Total-blocking, opening and part-blocking. The blocking conditions of slit dam are closely link tob/d max (the ratio of slit width to maximum diameter of solid matter), asb/d max is less than 0.739, the slit dam is total-blocking; andb/d max is more than 1.478, the slit dam will be opening; whereasb/d max from 0.739 to 1.478, the slit dam is part-blocking. ② variation of the mean density passing through slit dam is the most obvious asb/d max ranges from 0.739 to 1.232. ③ According to experimental results, slit dams have been shown to be effective in reducing debris flow density while slit density ∑b/B (B is slit dam width) ranges from 0.2 to 0.5.
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