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• W2005423926 abstract "ARTICLE I NFO In order to investigate the effects of temperature, thickness of soil layer, wetting and drying cycles and soil types on geometrical structure of surface shrinkage cracks in clayey soils, special software Crack Image Analysis System (CIAS) for analyzing shrinkage crack patterns was developed. Eight groups of soil samples were prepared and subjected to drying to crack in laboratory. The number of crack segments and intersections, average crack length, width and aggregate area, crack intensity factor (CIF), and the corresponding probability density functions (PDF) of these parameters were determined by analyzing several crack patterns derived from different experimental conditions. The results show that the soil cracking behavior and the geometrical structure of crack patterns are significantly influenced by these considered factors. There is a tendency of crack length, width, aggregate area and their most probable value (MPV) related to the PDF increases with temperature increase. With thicker soil layers, the average crack length, width, aggregate area and CIF are increased, and the main distribution ranges of crack length, width and aggregate area are increased also. When the soil is subjected to multiple wetting-drying cycles, the soil surface generates more irregular and coarse cracks. The number of short and narrow crack segments increases significantly, and the CIF decreases with an increase in wetting-drying cycles. It is also observed that the extent of cracking is directly related to the soil fines fraction and its plasticity index (IP). The greatest CIF and crack width are observed in the soils with the largest fines fraction and highest IP. In addition, the ratio of numbers of crack segments to intersections ranges from 1.5 to 2, and cracking mainly takes place in three stages: main-cracks initiation stage; sub-cracks initiation stage; terminal stable stage. It is a natural phenomenon that surface cracks develop in clayey soils as they shrink when dried. These cracks create weakness zones in a soil mass causing reduction in the overall mechanical strength and increase in the compressibility. Thus, engineering properties, stabi- lities of buildings and structures that are constructed on clayey soils would be affected by changes in mechanical properties. Moreover, the formation of cracks often results in failure of slope. Hydraulic properties of clayey soils are controlled to a large extent by the geometries of their crack networks. Since the size (width, length and depth) and tortuosity of cracks govern the rate and the velocity at which solutes and microorganisms are transported in the soil profile, the distribution and the connectivity of these cracks determine flow pathway, and thus control dispersal of substances in soil mass. The growth of the crops can be affected by the formed cracks. The claysoil- based structures such as waste containment facilities can be compromised by the formation of shrinkage cracks, the diffusion of pollutant along the cracks may speed up and at a much greater rate than the surrounding matrix. Therefore, it is important to study this" @default.
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• W2005423926 date "2008-10-01" @default.
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• W2005423926 title "Influencing factors of geometrical structure of surface shrinkage cracks in clayey soils" @default.
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• W2005423926 doi "https://doi.org/10.1016/j.enggeo.2008.05.005" @default.
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