The Wenchuan earthquake has induced a great mass of collapse and landslide in the Longmen Mountain area,leading to the occurrence of extra-large scale debris flows.Through analyzing the failure reasons of two typical debris flow prevention engineerings,the main reason was that the stone masonry structure,which has been widely applied currently,has weak availability of resistance from debris flow.In order to resist the damaging of extra-large scale debris flows,new engineering structures were proposed for preventing debris flow,such as combination of check dam and drainage canal.The details of these new structures were check dam with the type of reinforced concrete frame + stone masonry dam body and prefabricated reinforced concrete cube boxes,drainage canal with the type of compound section and prefabricated reinforced concrete cube boxes.These new structures can improve the resistant abilities of check dams,decrease construction cycle,protect eco-environment of drainage area and make full use of existing materials in the gully without increasing investment.This new technology proposed can effectively control the extra-large scale debris flow in the Longmen Mountain area.
