Effect of soaking time of dithionite-citrate-bicarbonate solution on strength and deformation characteristics of lateritic soil
作者机构：State Key Laboratory of Geomechanics and Geotechnical EngineeringInstitute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China College of Water Resources and Architectural EngineeringNorthwest Agriculture and Forestry UniversityYangling712100China School of Civil EngineeringWuhan UniversityWuhan430072China
出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报(英文版))
年 卷 期：2023年第15卷第11期
页 面：3039-3049页
核心收录：
学科分类：08[工学] 0818[工学-地质资源与地质工程] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：support for this work was provided by the National Natural Science Foundation of China(Grant Nos.41772339 41877281 and 52178372)
主 题：Lateritic soil Ménard pressuremeter test(PMT) Free-iron-oxides Dithioniteecitrateebicarbonate(DCB) Effective cementation of iron
摘 要：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.
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