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|標題:||An experiment on the debris flow plain screening
The dam body is damaged by the huge impaction from the debris flow and the sand-trapping capacity is not enough are the two challenges to the open dam. Therefore, this plain screening device has studied. This device composes of two dams with small spacing. Many structure steels I-beam are mounted on the two dams with designed spacing. The I-beam is parallel to the water flow. This device has the properties as the general open dam. This device can adjust the outflow of the debris and avoid the direct impaction from the debris flow. And some sand-trapping capacity can shift to the downstream. The device can form main channel and by-pass. The coarse cobble can move above the I-beam screen and deposit in the main channel downstream of the device. The fine particle and water of the debris flow will drop through the I-beam screen and flow through the by-pass to the downstream.
The purpose of this experiment is to analyze the effect on stop and deposit of debris flow by adjusting the slope of the plain screening device. The results of this experiment are described as follows:
1.Due to the debris flow affected by the plain screening device, there is a repeated phenomenon of move and stop of the debris flow. And, at last, it stops.
2.The vertical distribution of the grain size shows that the higher the elevation the smaller the particle size.
3.From the experiment, we know that this device is economical and has better effect in separation for coarse cobble and fine particle when the slope is between 22˚ to 24˚.
|Appears in Collections:||水土保持學系|
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