CHEN Hong-kai  TANG Hong-mei  SHI Jing-xu  LI Ke  WANG Yong-zhi

（Institute of Geotechnical Engineering, Chongqing Jiaotong University,  Chongqing   400074）

Abstract: Debris flow along highway, locating near highways and impacting on bridges, culvert, roadbeds, road surface structures and relevant project against debris flow and destroying that through embodying, belongs to a disaster in highways. It is the general background to trigger giant debris flow that abundant material, meteological environment with fohn effect, and there are the same between axis direction of debris flow valley and main compressive direction of neotectonic field. Simplifying debris flow as two-phases fluid, using  two-phase fluid theory, movement mechanics of sediment, Bingham hyeological equations and testing data of interaction action between particles by Bagnold, the authors establish initially the methods to calculate velocity of solid phase and liquid phase in debris flow, to calculate impact force of debris flow through formality on surface of control structure and bank of debris flow valley, and to calculate abrasion force of debris flow. Develop tens of techniques against debris flow such as high-speed drainage structure, debris flow tunnel and wing-shaped converge structure etc. Further, develop some synthetic model against debris flow such as block-converge-drainage model through using these techniques. Then write and publish《Guiding of Design and Construction of Projects against Debris Flow along Highways》, which is applied in 60 projects to control debris flow and express good effect. Researches above establish primitively theories and techniques of debris flow along highways.

Key words: debris flow along highway, key theories of dynamics of debris flow, control techniques, design guiding, construction guiding