철강재 바닥스크린의 토석류 피해저감 기능 극대화를 위한 측면스크린의 부착 효과
The Effect of Side Screen Attached to Flat-board Debris-flow Breaker on Damage Reduction
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초록
이 논문에서는 바닥스크린의 토석류 피해저감 기능을 더욱 극대화하기 위하여 바닥스크린에 측면스크린을 부착하여 그 효과를 파악함으로써 측면스크린의 적정 순간격을 도출하고자 하였다. 그 결과, 바닥스크린에 측면스크린을 부착함으로써 작은 입경의 공급재료가 소량 측면스크린을 통과하였다. 그 대신에 바닥스크린의 상단면부에는 토석류의 선단부를 구성하던 큰 입경의 토석들이 측면스크린에 의해 규제된 유로폭 내에서 다량 포착된 후, 이 두터운 조립질층의 공극을 작은 입경의 계상재료가 메워 세립화되는 것으로 나타났다. 이러한 세립화는 결국 바닥스크린의 상단면부로부터 하단면부로의 토사 투과를 차단하여 결국 바닥스크린 하단면부에서의 퇴적량은 감소하였다. 한편, 이러한 바닥스크린의 기능 향상은 측면스크린의 순간격이 계상재료의 평균입경 및 최대입경에 일치할 경우가 동일하게 나타났다. 그러나 스크린 부재의 순간격이 클수록 시공비 절감에 유리할 것으로 추정되며, 따라서 바닥스크린에 부착하는 측면스크린의 순간격은 계상재료의 최대입경과 동일하게 하는 것이 바람직할 것으로 판단된다.
Abstract
The objectives of this study were to evaluate effects of the flat-board debris-flow breaker (FDB) equipped with side screen and to derive an optimal slit aperture of the side screen for maximizing its positive effects. The results showed that only a few small-sized materials were passed through side screen, causing storage at both sides of FDB. Instead, a massive amount of large-sized materials was trapped on the upper surface of FDB regulated by side screen, and this coarse layer was filled with fine sediment. This fining may not arrow passage of even fine materials from upper to lower surface of FDB. Meanwhile, concerning the damage reduction by debris flows, there was no functional difference between the mean and maximum grain-size slit apertures. However, because a larger slit aperture of the screens has an advantage in reducing construction costs, the slit aperture of FDB should be matched to the maximum grain size of bed materials.
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