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Effect of soaking time of dithionite-citrate-bicarbonate solution on strength and deformation characteristics of lateritic soil

引用

Journal of Rock Mechanics and Geotechnical Engineering 2023年第11期15卷 3039-3049页

作者： Wei Bai Wenbo Zhang Lingwei Kong Henghui Fan Aiguo Guo Guofang Xu State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China College of Water Resources and Architectural Engineering Northwest Agriculture and Forestry UniversityYangling712100China School of Civil Engineering Wuhan UniversityWuhan430072China

This study aimed to reveal the influence of different free-iron-oxides contents on the strength and deformation characteristics of in situ lateritic soil.A test method that combined the selective chemical dissolution method and in situ Ménard pressuremeter test(PMT)was *** soaking time in dithioniteecitrateebicarbonate(DCB)solution was used as a variable to control the free-iron-oxides content in lateritic ***,the in situ lateritic soil boreholes with different soaking time were tested by *** results showed that the in situ horizontal pressure p0,critical edge pressure pf,ultimate pressure prediction pl,pressuremeter modulus Em,shear modulus Gm,and foundation-bearing capacity f0k of lateritic soil decreased rapidly after immersing in DCB solution within 1e4 *** increasing soaking time,the decrease rate reduced ***,the relationship curve between free-iron-oxides content and soaking time declined rapidly and then stabilized,and the free-iron-oxides content at the inflection point was 30.11 g/*** the free-iron-oxides content changed to the inflection point,the free-iron-oxides that played a cementing role was largely removed,indicating that the effective cementing iron-content of Miaoling lateritic soil was about 52.9%.This study demonstrated that the proposed test method can determine the influence of free-iron-oxides content on the strength and deformation characteristics of lateritic soil.

关键词： Lateritic soil Ménard pressuremeter test(PMT) free-iron-oxides Dithioniteecitrateebicarbonate(DCB) Effective cementation of iron

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