Vol20 No.12:3552-3567

【Title】Influence law of modified glutinous rice-based materials on gravel soil reinforcement and water erosion process

【Author】ZHANG Weng-xiang¹; PEI Xiang-jun¹*; ZHANG Xiao-chao¹*; WU Xue-min¹; XIAO Wei-yang²; QIN Liang^3,4; ZHU Jin-yu¹

【Addresses】1 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China.; 2 Jiuzhaigou Administration, Aba 623400, China; 3 Sichuan Geological Environment Survey and Research Center, Chengdu 610084, China; 4 Sichuan Huadi Construction Engineering Co., Ltd, Chengdu 610036, China

【Corresponding author】PEI Xiang-jun¹*; ZHANG Xiao-chao¹*

【Citation】Zhang WX, Pei XJ, Zhang XC, et al. (2023) Influence law of modified glutinous rice-based materials on gravel soil reinforcement and water erosion process. Journal of Mountain Science 20(12). https://doi.org/10.1007/s11629-023-8271-7

【DOI】https://doi.org/10.1007/s11629-023-8271-7

【Abstract】Alarge number of loose piles formed by mountain hazards are highly susceptible to hydraulic erosion under rainfall conditions. The use of ecological substrate materials for erosion control and ecological restoration of gravel soil slopes has become a current research hotspot and the study difficulty. The post-earthquake slump accumulation gravel soil in Jiuzhaigou was selected as the research object, and the self-developed modified glutinous rice-based material was used to reinforce the gravel soil. The variable slope flume erosion test and rainfall simulation test were carried out to study the water erosion resistance of the material reconstructed soil under the influence of runoff erosion and raindrop splash erosion. The results show that: As the material content reached 12.5%, the reconstructed soil did not disintegrate after 24 hours of immersion, the internal friction angle was increased by 42.26%, and the cohesion was increased by 235.5%, which played a significant reinforcement effect. In the process of slope erosion, the soil rill erodibility parameter Kr was only 3‰ of the gravel soil control group, the critical shear force τ increased by 272%, and the soil erosion resistance was significantly improved.In the process of rainfall and rainfall on the slope, the runoff intensity of the reconstructed soil was stable, and the ability to resist runoff erosion and raindrop splash erosion was enhanced. The maximum value of soil loss rate on different slope slopes is 0.02-0.10
g·m^-2s^-1, which is significantly lower than that of the control group and has better erosion reduction effect.

【Keywords】Modified glutinous rice substrate; Gravel soil; Soil reconstruction; Trauma repair; Water erosion