Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (1): 125-134.doi: 10.16285/j.rsm.2020.0623

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of seepage in wide-grading soils with particles migration

ZHU Qin1, 2, SU Li-jun1, 2, 3, 4, LIU Zhen-yu1, 2, YANG Shi-hao1, 2   

  1. 1. Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China; 4. China-Pakistan Joint Research Centre on Earth Sciences, Chinese Academy of Sciences and Pakistan Higher Education Commission, Islamabad, Pakistan
  • Received:2020-05-15 Revised:2020-09-27 Online:2021-01-11 Published:2021-01-06
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41790432, 41761144077) and the International Partnership Program of Chinese Academy of Sciences (131551KYSB20180042).

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Abstract: The study on the seepage in wide-grading soils, the main material of colluvial landslides, is the premise and foundation of the research on the mechanism of rainfall-induced colluvial landslides. The seepage in wide-grading soils is a complex process including the transport of water and fine particles. However, the migration of fine particles is usually ignored. Therefore, three soil samples with different D15 /d85 (D15 is the particle size which 15% of the coarse-grained group by weight is finer than; d85 is the particle size which 85% of the fine-grained group by weight is finer than) were tested by self-made large-scale permeameter to study the transport of water and fine particles in wide-grading soils. The results show that the D15 /d85 has a vital influence on the permeability coefficient and the migration of fine particles. The smaller permeability coefficient is, the more difficult migration of fine particles occur in soils of small D15 /d85; the larger permeability coefficient is with the violent change, and significant fine particles movement observed in soils of large D15 /d85. The change of permeability coefficient reflects the movement of fine particles in the soil, and three modes of particle migration are proposed for the wide-grading soils. The research improves the understanding of the permeability characteristics of wide-grading soils and provides a new mechanism of rainfall-induced colluvial landslides.

Key words: wide-grading soils, D15 /d85, permeability, the migration of fine particles

CLC Number: 

  • TU 411
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