Vol16 No.4: 793-805
【Title】Spatial-temporal distribution of debris flow impact pressure on rigid barrier
【Author】LIU Dao-chuan1,2; YOU Yong1*; LIU Jin-feng1; LI Yong1; ZHANG Guang-ze3; WANG Dong3
【Addresses】1 Key Laboratory of Mountain Hazards and Earth Surface Processes, and Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 China Railway Eryuan Engineering Group co., LTD, Chengdu 610031, China
【Corresponding author】YOU Yong
【Citation】Liu DC, You Y, Liu JF, et al. (2019) Spatial-temporal distribution of debris flow impact pressure on rigid barrier. Journal of Mountain Science 16(4). https://doi.org/10.1007/s11629-018-5316-4
【Abstract】Grain composition plays a vital role in impact pressure of debris flow. Current approaches treat debris flow as uniform fluid and almost ignore its granular effects. A series of flume experiments have been carried out to explore the granular influence on the impact process of debris flow by using a contact surface pressure gauge sensor (Tactilus®, produced by Sensor Products LLC). It is found that the maximum impact pressure for debris flow of low density fluctuates drastically with a long duration time while the fluctuation for flow of high density is short in time, respectively presenting logarithmic and linear form in longitudinal attenuation. This can be ascribed to the turbulence effect in the former and grain collisions and grain-fluid interaction in the latter. The horizontal distribution of the impact pressure can be considered as the equivalent distribution. For engineering purposes, the longitudinal distribution of the pressure can be generalized to a triangular distribution, from which a new impact method considering granular effects is proposed.
【Keywords】Debris flow; Impact force; Grain composition; Spatio-temporal distribution; Dynamic coefficient