一种泥石流拦砍坝溢流口的防冲设施

本文介绍的是四川省黑水县芦花沟泥石流拦砂坝溢流口防止冲刷的一种钢件结构设施。其结构型式是:在拦砂坝溢流口下游侧底面与下游坝体垂直临空面交接处,用8-10毫米的钢板作成,伸出下游临空面59厘米,高出溢流口底面10-15厘米的钢件,用φ25毫米的螺纹钢筋焊接后,再在坝体溢流口浇筑50厘米厚的200号钢筋混凝土,使其与拦砂坝衔接成整体。有这种设施的溢流口,能拦蓄一层泥石流,起消能和缓冲作用。在后来的泥石流过坝时,将泥石流对坝体溢流口直接的冲刷、摩擦、碰撞和淘蚀作用的外力,变成泥石流内部的石磨石、砂磨砂的内力,从而保护拦砂坝溢流口不被过坝泥石流所破坏。

An insallation to protect the spillway of debris flow check dam from scouring

This paper describes an innovative steel structure and installations forscouring prevention adopted in the spillway of the debris flow controlproject in Luhua Ravine of Heishui county,Sichuan province. The struc-ture is designed as, at the joint of lateral bottom and air face downstream the spillway of check dam, a 8-rocm thick steel plate was used to make a steel part which extrends out 50cm from the downstream air faceand rises 10-15cm, welded on double threading steel bar 25mm in diame-ter, it was casted into a steel bar-reinforced stopper,No. 200 in 50cm,connected with the check dam as a whole. Check dams with a spillwaystructured in this way can retain a layer of debris flow and play a role ofenergy dissipation and cushioning. When the following debris flows cro-ss the dam, the external force of direct scouring, friction, impact andundercut exerted on the dam by debris flow would be transformed intothe inner stress of stone against stone and sand against sand inside deb-ris flow, thus protecting the dam outled from the damage by debris flowwhich would cause the destruction of the whole dam.