Efficiency of Slit Dam Prevention against Non-Viscous Debris Flow

摘要

This paper describes an experimental work in order to assess the efficiency of slit dam on non-viscous dehris flow. Some results have been acquired as follows; (1) there are three kinds of blocking type: Total-blocking, opening and part-blocking. Theblocking conditions of slit dam are closely link to b/d_(max) (the ratio of slit width to maximum diameter of solid matter), as b/d_(max) is less than 0.739, the slit dam is total- blocking; and b/d_(max) is more than 1.478, the slit dam will be opening;whereas b/d_(max) ranges 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 as b/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.