稀性泥石流沟道侵蚀试验研究

Experimental Study on Gully Erosion of Diluted Debris Flow

泥石流对沟道的侵蚀破坏作用比一般水流强烈,由于对其侵蚀深度的估计不足,往往导致防治工程的失效。通过室内等比模拟稀性泥石流沟道侵蚀试验来探究其规律。试验研究表明:坡度变化对侵蚀效果的影响大于流量的影响;在一定范围内,侵蚀深度随泥石流的磨损力增大呈线性增加,并给出经验公式。结合野外调查,对于松散堆积物源较厚的沟道流通区,该经验公式具备一定的适用性。

Erosion damage effects of debris flow for the gully are more stronger than normal flow. Due to under- estimate the erosion depth of debris flow, it often leads to the failure of prevention engineering. In order to explore the law of gully erosion of diluted debris flow, indoor isometric simulation experiments were carried out. Experimen- tal results show that ① the influence of slope gradient is greater than flow on erosion effect; ② Within a certain range, the erosion depth increases with the increase of force of wearing and the experience formula was proposed. Combined with field investigation, the experience formula has a certain applicability in gully flow areas where loose deposits are thick.