초록

AI-Helper

강우강도에 따른 산사태 발생시 사태물질의 확산범위를 합리적으로 예측하기 위하여 산사태 모형실험을 실시하였다. 이를 위하여 먼저 산사태 모형실험장치 및 강우재현장치를 개발 및 제작하고 강우강도에 따른 일련의 모형실험을 실시하였다. 산사태 모형실험장치는 토사층과 암반층사이의 경계면에서 주로 발생되는 우리나라의 산사태 발생특성을 고려하여 제작하였다. 강우재현장치는 강우강도가 100㎜/hr에서 1,000㎜/hr까지 조절이 가능하도록 제작하였다. 모형사면지반의 재료로는 주문진 표준사를 사용하였다. 본 논문에서는 사면경사를 25°, 사면지반의 상대밀도를 35%로 고정하고, 강우강도를 150~250㎜/hr로 변화시켜 일련의 실험을 실시하였다. 실험결과 산사태 발생시점에서 간극수압은 급격하게 증가하는 것으로 나타났으며, 강우강도가 증가함에 따라 산사태 발생규모가 증가됨을 알 수 있다. 확산범위는 팬형태로서 산사태 발생 초기단계에서 급격하게 증가하고 이후 완만하게 증가하는 것으로 나타났다. 확산범위 증가속도는 강우강도에 영향을 받으며, 사태물질의 확산면적은 강우강도와 강우지속시간에 영향을 받는 것으로 나타났다. 그리고 겉보기 마찰계수와 인장균열의 위치를 이용하여 사태물질의 체적 및 확산범위를 산정할 수 있는 단단한 방법을 마련하였다.

Abstract ▼ AI-Helper

Landslide model tests considering hourly rainfall were performed to investigate and estimate the run out distance induced by landslides. The model flume and the rainfall simulator were designed and produced. The model flume was designed in consideration of the landslide characteristics of Korea. The...

Landslide model tests considering hourly rainfall were performed to investigate and estimate the run out distance induced by landslides. The model flume and the rainfall simulator were designed and produced. The model flume was designed in consideration of the landslide characteristics of Korea. The landslides in Korea were mainly occurred in the interface between soil layer and rock layer. The rainfall simulator was produced for controlling hourly rainfall ranged from 100 ㎜/hr to 1,000 ㎜/hr. Jumnunjin standard sand as slope soils was placed on the model flume. The model experiments were performed with changing the hourly rainfall ranged from 150 ㎜/hr to 250 ㎜/hr. In this experiments, the inclination of slope was 25° and the relative density of slope soils was 35%. As a result of experiments, the pore water pressure is rapidly increased at landslide occurring time, and the scale of landslide is increased with increasing in hourly rainfall. The spreading range of run out distance is occurred with pan type, and the spreading width and length are rapidly increased in its early stage and slowly increased after early stage. The increasing velocity of runout distance of debris is influenced by hourly rainfall, and the spreading area is influenced by both hourly rainfall and during time. The simple method to estimate debris volume and runout distance was proposed using the apparent coefficient of friction and the location of tension crack.

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