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[1]HE Daixun,ZHANG Jiaming,CHEN Mao,et al.Influence of Particle Size Composition on Desiccation Cracks of Red Clay[J].Research of Soil and Water Conservation,2022,29(05):185-191.

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Influence of Particle Size Composition on Desiccation Cracks of Red Clay

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 05 Page number: 185-191 Column: Public date: 2022-08-20

Title:: Influence of Particle Size Composition on Desiccation Cracks of Red Clay

Author(s):: HE Daixun, ZHANG Jiaming, CHEN Mao, LONG Yunkai; (Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China)

Keywords:: engineering geology; desiccation crack; laboratory desiccation tests; red clay; particle size composition

CLC:: X4; TU446

DOI:: -

Abstract:: The effects of particle size composition on the development of desiccation cracks in red clay were studied. This study can provide a theoretical basis for engineering construction and disaster prevention in red clay areas. Through laboratory drying tests on saturated mud samples, the effects of particle size composition on the water evaporation, the formation and evolution of desiccation cracks, and the surface desiccation cracks structure morphology of red clay were investigated. The results show that:(1)the evaporation curves can be divided into four stages, and the constant rate stage is the most essential stage of the evaporation curves;(2)the decrease of particle size reduces the constant stage duration;(3)the increased spread of particle size distribution also reduces the duration of the constant rate stage;(4)there is no obvious relationship between evaporation rate and particle size, particle size distribution;(5)the formation and evolution of drying shrinkage cracks can be divided into five stages, and the most significant stage is the stage of desiccation crack formation;(6)particle size composition affects the duration of desiccation crack formation, derivative relationship of different grade desiccation cracks, segmentation of cracking curve, fracture network structure and soil block distribution; desiccation crack of natural grain specimens produces upward curl phenomenon;(7)particle size composition affects segmentation of cracking curve as well; the larger the particle size distribution spread, the stronger distribution non-uniformity of the desiccation cracks of red clay is, and the more significant surface crack rate is, the more significant no effect on the particle size is;(8)particle size composition affects the surface desiccation crack structure morphology and clod distribution on the surface of specimens; the decrease of particle size reduces the fractal dimension of surface cracks. Therefore, it can be concluded that particle size distribution and distribution non-uniformity deeply affect the process of water evaporation, formation and evolution of desiccation cracks, and the surface desiccation crack structure morphology of red clay. These research results can provide reference for reducing the disasters and taking precautions against the calamities to help the construction of the red clay soil area.

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Last Update: 2022-08-20