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

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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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Analysis of lateritic soil Reinforced with Palm Kernel Shells for Use as a Sub-Base Layer for Low-Traffic Roads

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1469-1482页

作者： Joel Koti Crespin P.Yabi Mohamed Gibigaye Anne Millien Christophe Petit LEMA University of Abomey-CalaviCotonouBenin GC2D University of Limoges17 Bd Jacques DercheEgletonsFrance National University of Sciences TechnologiesEngineering and MathematicsAbomeyBenin

In tropical areas,palm oil production generates significant amounts of waste,including palm kernel *** use of this waste in the civil engineering sector,presents a very challenging *** the present study,the production of lateritic soil(A-2 in GTR classification and A-7-6(9)in HRB classification)reinforced with palm kernel shells is *** order to improve their performances,these materials are mixed using the Fuller’s parabolic ***,experimental tests are used to characterize the physical and mechanical geotechnical properties of the lateritic *** characterizing the matrix(i.e.,lateritic soil)and the inclusions(i.e.,palm kernel shells)in their natural state,it is found that Avrankou’s lateritic soil has a high level of fine particles(56.6%),high plasticity(PI=21%)and low lift(ICBR=17%);which makes it unusable in the pavement *** also prove that the mixture composed of 39%of lateritic soil volume and 61%of PKS with a CBR index equals to 30 and the mixture composed of 45%of lateritic soil,40%PKS and 15%of lagoon sand with a CBR index equals to 41 can be used as sub-base layer for roads for low and medium traffic,respectively.

关键词： Palm kernel shell lateritic soil subbase layer low-traffic roads

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Effect of pH on transport of Pb^(2+),Mn^(2+),Zn^(2+) and Ni^(2+) through lateritic soil: Column experiments and transport modeling

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Journal of Environmental Sciences 2011年第4期23卷 640-648页

作者： Srilert Chotpantarat Say Kee Ong Chakkaphan Sutthirat Khemarath Osathaphan National Center of Excellence for Environmental and Hazardous Waste Management (NCE-EHWM) Chulalongkorn University Bangkok 10330 Thailand Department of Geology Faculty of Science Chulalongkorn University Phayathai Road Pathumwan Bangkok 10220 Thailand Department of Civil Construction and Environmental Engineering Iowa State University Ames IA USA Environmental Research Institute Chulalongkorn University Phayathai Road Pathumwan Bangkok 10330 Thailand Department of Environmental Engineering Faculty of Engineering Chulalongkorn University Phayathai Road Pathumwan Bangkok 10330 Thailand

This study investigated the effects of pH on the transport of Pb 2＋ , Mn 2＋ , Zn 2＋ and Ni 2＋ through lateritic soil columns. Model results by fitting the symmetric breakthrough curves （BTCs） of bromide （Br ） with CXTFIT model suggested that physical non-equilibrium processes were absent in the columns. The heavy metal BTCs were, however, asymmetrical and exhibited a tailing phenomenon, indicating the presence of chemical non-equilibrium processes in the columns. The retardation factors of Pb 2＋ were the largest of the four metal ions at both pH 4.0 （33.3） and pH 5.0 （35.4）. The use of Langmuir isotherm parameters from batch studies with HYDRUS-1D did not predict the BTCs well. Rather the two-site model （TSM） described the heavy metal BTCs better than the equilibrium linear/nonlinear Langmuir model. The fraction of instantaneous sorption sites （ f ） of all four metal ions on the lateritic soil was consistently about 30%–44% of the total sorption sites.

关键词： pH effect heavy metals HYDRUS-1D two-site model lateritic soil

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Saturated anisotropic hydraulic conductivity of a compacted lateritic soil

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 986-991页

作者： Roberto Aguiar dos Santos Edmundo Rogerio Esquivel Varzea Grande Institute of Engineering Federal University of Mato Grosso Cuiaba Mato Grosso Brazil Sao Carlos School of Engineering University of Sao Paulo Sao Carlos Sao Paulo Brazil

This study focuses on the saturated anisotropic hydraulic conductivity of a compacted lateritic clayey sandy soil. The effects of the molding water content and the confining stress on the anisotropic hydraulic conductivity are investigated. The hydraulic conductivity is measured with a flexible-wall permeameter. Samples are dynamically compacted into the three compaction states of a standard Proctor compaction curve： the dry branch, optimum water content and wet branch. Depending on the molding water content and confining stress, the hydraulic conductivity may increase or decrease. In addition, the results indicate that, when the samples are compacted to the optimum water content, lower hydraulic conductivity is obtained, except at a confining stress equal to 50 kPa. The increase of the confining stress decreases the hydraulic conductivity for each of the evaluated compaction states. In the wet branch, horizontal hy- draulic conductivity is about 8 times higher than the vertical value. The anisotropic hydraulic conduc- tivities of the dry and wet branches decrease when the confining stress increases, and the opposite is observed in the optimum water content state.

关键词： Hydraulic conductivity Anisotropic behavior lateritic soil Tropical soil Compacted soil

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Effects of physical properties on electrical conductivity of compacted lateritic soil

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Journal of Rock Mechanics and Geotechnical Engineering 2013年第5期5卷 406-411页

作者： Wei Bai Lingwei Kong Aiguo Guo State Key Laboratory of Geomechanics and Geotechnical Engineering.Institute of Rock and soil Mechanics Chinese Academy of Sciences

Natural soils of various types have different electrical properties due to the composition,structure,water content,and *** order to investigate the electrical properties of lateritic soil,electrical conductivity experiments have been conducted on a self-developed testing *** results show that the electrical conductivity of laterite increases with the increase of water content,degree of saturation and dry *** the water content is below the optimum water content,the electrical conductivity of soils increases nonlinearly and the variation rate increases ***,when the water content,degree of saturation,or dry density increases to a certain value,the electrical conductivity tends to be a *** addition,soil electrical conductivity increases with the increase of temperature,and it is observed that the electrical conductivity decreases with the increase of the number of wetting–drying cycles.

关键词： lateritic soil Electrical conductivity Water content Dry density Temperature

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Effects of physical properties on electrical conductivity of compacted lateritic soil

Effects of physical properties on electrical conductivity of...

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第13届全国岩石动力学学术会议

作者： Wei Bai Lingwei Kong Aiguo Guo State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences

关键词： lateritic soil Electrical conductivity Water content Dry density Temperature

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Performance evaluation of laterite soil embankment stabilized with bottom ash,coir fiber,and lime

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Journal of Mountain Science 2024年第7期21卷 2334-2351页

作者： Yunusa Hamdanu SANI Amin EISAZADEH School of Civil Engineering and Technology Sirindhorn International Institute of TechnologyThammasat UniversityPathum Thani 12120Thailand

In tropical regions,heavy rainfall induces erosion and shallow landslides on road ***-based stabilization methods,common in these regions,contribute to climate change due to their high carbon *** study explored the potential application of coir fiber-reinforced laterite soil-bottom ash mixtures as embankment materials in the *** objective is to enhance engineered embankment slopes'erosion resistance and stability while offering reuse options for industrial *** study examined various mix designs for unconfined compressive strength(UCS)and permeability,utilizing 30%bottom ash(BA)and 1%coir fiber(CF)with varying sizes ranging from 10 to 40 mm,6%lime,and laterite soil(LS),followed by microstructural *** results demonstrate that the compressive strength increases as the CF length increases to 25 *** contrast,permeability increases continuously with increasing CF ***-treated mixtures exhibit superior short-and long-term strength and reduce permeability owing to the formation of cementitious materials,as confirmed by microstructural analyses.A lab-scale slope box was constructed to evaluate the surface erosion of the stabilized laterite soil *** on the rainfall simulation results,the LS-BA-CF mixtures show better resistance to erosion and deformation compared to untreated LS,especially when lime is added to the top *** study provides insights into a sustainable and cost-effective approach for slope stabilization using BA and CF,offering a promising solution for tropical regions susceptible to surface erosion and landslides.

关键词： lateritic soil Bottom ash Coir fiber lime Unconfined compressive strength Permeability FESEM/EDS Rainfall simulation tests

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Influence of variables related to soil weathering on the geomechanical performance of tropical soils

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2423-2440页

作者： Rodrigo Cesar Pierozan Gregorio Luís Silva Araújo Ennio Marques Palmeira Celso Romanel Department of Civil Engineering Federal Institute of EducationScienceand Technology of RondoniaPorto VelhoROBrazil Department of Civil and Environmental Engineering University of BrasiliaBrasiliaDFBrazil Department of Civil and Environmental Engineering Pontifical Catholic University of Rio de JaneiroRio de JaneiroRJBrazil

This paper presents an experimental and analytical investigation of the influence of variables related to soil weathering on the geomechanical performance of sand-silt mixtures containing lateritic soils,*** weathered tropical soils with the influence of interparticle *** sand-silt mixtures containing different relative proportions between uniform sand and lateritic soil were produced,and geomechanical soil characterization tests were *** on the results,a transition from a primarily coarse-to a fine-grained prevailing soil structure was found to cause considerable impact on the geomechanical performance of these soils,as evidenced by design variables related to soil mineralogy and size distribution ***,fines contents of both individual soil particles and soil aggregations were found to correlate with experimental results,while the relative proportion between sesquioxides(aluminum,and iron oxides),and silica,***-silica ratios(SSR^(-1)),facilitated estimates concerning changes in geomechanical ***,the application of the sandsilt mixtures containing lateritic soil on soil walls reinforced with polymeric strips was also evaluated,further emphasizing the potential advantages of adopting variables related to soil weathering on design guidelines concerning tropical soils.

关键词： Sesquioxides-silica ratio Tropical soils Sand-silt mixtures lateritic soil Reinforced soil walls

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Effect of Water Content and Grains Size Distribution on the Characteristic Resilient Young’s Modulus (<i>E<sub>c</sub></i>) Obtained Using Anisotropic Boyce Model on Gravelly lateritic soils from Tropical Africa (Burkina Faso and Senegal)

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Open Journal of Civil Engineering 2021年第1期11卷 134-152页

作者： Bibalo Ida Josiane Ki Makhaly Ba Rokhaya Gueye Pierre Hornych Ali Sana Laboratoire de Mécanique et Modélisation (L2M) UFR Sciences de l’Ingénieur Université de Thiès Thiès Sénégal

This research was carried out to determine the rheological parameters of lateritic soils in order to contribute to the improvement of the technical documents used for pavement design in tropical Africa. The study is based on the loading repeated of cyclic triaxial tests (LRT) performed at University Gustave Eiffel (formerly Institut Français des Sciences et Technologies des Transports de l’Aménagement et des Réseaux (IFSTTAR)) in Nantes with the application of the European standard EN 13286-7: 2004 [1]. The tests were performed at constant confinement stress and using the stepwise method to determine the resilient axial () and radial () deformation as a function of the axial and radial stresses. Four gravel lateritic soils from different sites selected in Burkina Faso and Senegal were the subject of this research for the triaxial tests. These materials have a maximum diameter of 20 mm a

关键词： lateritic soil Cyclic Triaxial with Repeated Loading (LRT) Characteristic Resilient Young’s Modulus Anisotropic Boyce Model Water Content Grains Size Distribution

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Effects of soil Compaction in the Fight against Unpaved Roads Degradation Due to Erosion Caused by Heavy Rain: Proposition of a Specific CBR Evaluation Model

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Engineering（科研） 2021年第3期13卷 95-104页

作者： Timothée Thierry Odi Enyegue Eric Flavien Mbiakouo-Djomo Hugues Tsanga Fabien Kenmogne Blaise Ngwem Bayiha Gilbert Tchemou Ebenezer Njeugna Didier Fokwa Laboratory of Mechanics Doctorate Unit of Engineering Sciences Doctorate School of Fundamental and Applied Sciences University of Douala Douala Cameroon Department of Rural Engeineering FASA University of Dschang Dschang Cameroon Civil Engineering Department Higher Technical Teacher’s Training College University oh Douala Douala Cameroon Mechanics Engineering Department Higher Technical Teacher’s Training College University oh Douala Douala Cameroon

Unpailt roads are generally subject to erosion, when they need to be bitumen, civil engineers need to know the geotechnical capabilities of the soil layers to be used as support, among these capabilities, for example, soil characteristics to withstand erosion. CBR has often been used to classify these soils according to their compaction. In this article, we propose a correlation between CBR and eroded soil mass through a simulator. Indeed, in this article we show that using a simulator, soils can be classified according to their ability to withstand water erosion, whether internal or external. Indeed it is shown that the mass of eroded soil is related to the compaction capacity of the soil just as the CBR also has. We study the effects and influence of soil compaction on the ability of an unpaved road to resist erosion caused by falling raindrops. To do this, lateritic soil is submitted to different compaction pressures. The compacted soil is then submitted to CBR test and rain fall through a mini rain simulator. Correlations between eroded soil masse and compaction pressure as well as CBR are derived. The study shows that the compaction reduces the erodibility and increases the bearing capacity of soil. The formula obtained is significant because we have a new way of evaluating soils in the laboratory.

关键词： Compaction Erosion lateritic soil Rain Drop Unpaved Roads

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