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| Experimental study on the propagation and deposit features of rock avalanche along 3D complex topography |
| WANG Yufeng1，2，XU Qiang2，CHENG Qiangong1，3，LI Yan1，ZHANG Jincun1 |
(1. Department of Geological Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；3. State-province Joint Engineering Laboratory of Spatial Information Technology for High-Speed Railway
Safety，Southwest Jiaotong University，Chengdu，Sichuan 610031，China) |
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Abstract To study the propagation behaviours of rock avalanche along 3D complex topography quantitatively，a 3D analogue model was built based on the true topography of the Xiejiadianzi rock avalanche. A series of experimental tests were conducted to document the propagation and deposit features of rock avalanche under the effect of 3D complex topography. Along the travelling path，the layout of complex terrains such as the twisted spots generated the rapid dissipation of the kinetic energy of rock avalanche，and reduced the travel distance finally. In the motion of rock avalanche，the existence of momentum transfer among particles played an important role in the long runout of the debris. The extension of small ramps along the both sides of the traveling path induced the shunting-converging movement of the debris，with longitudinal groove-like troughs formed finally. When the debris reached the open area of the travelling path，it transferred into an unconfined spreading movement with particle collisions occurred frequently. Under the co-work of the pushing force，gravity and topography，squeezing effect occurred in the motion of particles with stress ridges generated.
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2016, Vol. 35 
