JIANG S Y, XIANG X Q, LI Y R,et al.Physical simulation study on the migration and deposition of fine particles in rock piles under rainfall infiltration conditions[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(2):77-86.

doi:10.16186/j.cnki.1673-9787.2021010077

Received:2021/01/18

Revised:2021/03/26

Published:2023/03/25

Physical simulation study on the migration and deposition of fine particles in rock piles under

 rainfall infiltration conditions

JIANG Siyuan1, XIANG Xiqiong1,2, LI Yanrong3, YANG Xinting2, WANG Junyi1, TAN Lili1, LYU Yadong1

1.Key Laboratory of Karst Geological Resources and Environment of Ministry of Education，Guizhou University，Guiyang  550025，Guizhou，China；2.College of Resources and Environmental Engineering，Guizhou University，Guiyang  550025， Guizhou，China；3.School of Mining Engineering，Taiyuan University of Technology，Taiyuan  030024，Shanxi，China

Abstract:The physical simulation of the migration and deposition of fine particles in the rock pile under rainfall infiltration was carried out to address the problem of instability and failure of the rock pile along the circular sliding surfaces.The test revealed the formation process of circular sliding surfaces inside the rock pile，and the migration and deposition pattern of fine particles and the form of deposition structure was analyzed.Based on the large-sized shear test， the stability of the skeleton rock pile was analyzed，and the results qualitatively explained the relationship between the distribution of fine particles and stability.The study showed that under certain pore structures，fine particle conditions and hydrodynamic conditions，the fine particles easily migrated with the groundwater seepage path to form a circular relative water-resisting layer in the rock pile.According to the experimental statistics，there were multi-level circular depositional surfaces，shallow superficial circular depositional surfaces and basal sublinear circular depositional surfaces in the rock pile.These areas were transformed from coarse grained soils to gravelly soils and the permeability coefficient was decreased.Groundwater infiltration caused an increase in pore pressure and osmotic pressure and a decrease in the angle of internal friction，which affected the stability of the rock pile.For rock piles that were mainly skeletal at the beginning of the collapse，the migration and deposition of internal fine particles might cause destabilization of the rock pile.Based on the detection of a rock pile in Guizhou by high-density electrical method，it was clear that the migration of fine particles was more likely to cause shallow landslides in rock piles.

Key words:rock pile;fine particle;migration;deposition;circular sliding surface

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