DEBRIS FLOW DIVERSION DAM AUTOMATICALLY DISTRIBUTING DRAINAGE AND SILTING AND DESIGN METHOD THEREOF

摘要

Disclosed are a debris flow diversion dam automatically distributing drainage and silting and a design method thereof. The diversion dam comprises a dam foundation (1) and a dam main body provided on the dam foundation (1); the bottom part of the dam main body is provided with a diversion hole (2) connected to a drainage ditch, the top part of the dam main body is provided with a diversion weir (3) which is connected to a silting field; the diversion weir (3) is located above a side of the diversion hole (2), and the elevation of a top face of the diversion hole (2) is the same as the elevation of a bottom face of the diversion weir (3); and the size of the cross-sectional area of the diversion hole (2) is determined by the projected throughput of the drainage ditch, and the size of the cross-sectional area of the diversion weir (3) is determined by the projected throughput of the silting field. The debris flow diversion dam uses a diversion hole to control the throughput of debris flow entering the drainage ditch, rationally distributing the debris flow to the drainage ditch and the silting field, preventing a higher volume than the projected standard of debris flow from overflowing in the drainage ditch, and also preventing a higher volume than a projected standard of debris flow from entering a main river and creating a landslide dam.