Reliability-based assessment of compacted lateritic soil liners

Afolayan, J O; Nwaiwu, Charles M. O.

doi:10.1016/j.compgeo.2005.08.001

Cited by 14 publications

(4 citation statements)

References 20 publications

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“…On the basis of this limit state, the first-order reliability method (FORM) was employed to estimate the first-order second-moment reliability index (b) values. Details of the relevant optimization procedure for FORM (written in FORTRAN) using FORM 5 (see Gollwitzer et al 1988) are described in Afolayan and Nwaiwu (2005).…”

Section: Limit State Functionmentioning

confidence: 99%

Statistical Distributions of Hydraulic Conductivity from Reliability Analysis Data

Nwaiwu

2008

Geotech Geol Eng

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This paper describes a first-order reliability-based analysis to identify the best-fit probability distributions for hydraulic conductivity. The analysis involved the use of existing hydraulic conductivity model developed from laboratory data and applied to lateritic soils, considering variations in soil parameters. Plots of reliability indices versus coefficients of variation were first made for hydraulic conductivity as well as for initial degree of saturation, plasticity index and clay content, considering three compactive efforts and log-normally distributed hydraulic conductivity. The traditional two-parameter log-normal distribution was compared to four alternative distributions: normal, gamma, Gumbel (extreme value type I-EVT-I) and Weibull (extreme value type III-EVT-III). The analysis showed that the Weibull and normal are the best-fit probability distributions for the hydraulic conductivity based reliability data. Hydraulic conductivities predicted from reliability analysis were used to demonstrate the possibility of applying the results obtained in this research by practising engineers. Experimentally-determined hydraulic conductivities were shown to be in good agreement with predicted values.

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Section: Limit State Functionmentioning

confidence: 99%

Statistical Distributions of Hydraulic Conductivity from Reliability Analysis Data

Nwaiwu

2008

Geotech Geol Eng

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“…The study results by [17] disclosed that the formation of lateritic soil is affected by parent rocks' chemical, mineralogical composition, and physical properties. The lateritic soils have been studied for their potential use in liners [18][19][20], highway construction [21], railway embankment [22] and building material [9]. Lateritic soil is widely used for road and railway construction; however, some road and railway deteriorations constructed over these kinds of soils are reported.…”

Section: Introductionmentioning

confidence: 99%

Characterization of lateritic soil based on literature and lab testing

Roshan

Hezmi

Rashid

et al. 2022

Preprint

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Lateritic soil resulting from weathering, particularly the chemical weathering process of rocks, is found widely in tropical and subtropical countries such as Malaysia, Thailand, Singapore, and Brazil. The characteristics of this residual soil depend on many factors, including weathering degree, chemical compositions, and laterization degree, indicating their varying properties from one place to another. Thus, it is essential to explore their characteristics before using them as a construction material for a particular structure. In this paper, a lateritic soil sampled from Universiti Teknologi Malaysia has been explored in terms of grain size distribution (GSD), Atterberg limits, specific gravity, compaction, unconfined compressive strength (UCS), unconsolidated undrained (UU) test, FESEM, and EDX. The obtained results indicated that the soil is classified as plastic silt (MH) and A-7-5 according to USCS and AASHTO methods, respectively. The optimum moisture content (OMC) and maximum dry density (MDD) were obtained 28 % and 1.39 g/cm3, respectively, based on the standard compaction method. The unconfined compressive strength (UCS) is 200.75 kPa, whereas, in the unconsolidated undrained (UU) test, the deviator stress is equal to 449.4 kPa, 529.3 kPa, and 674 kPa for 50, 100, and 200 kPa, respectively. The total friction angle and undrained cohesion are 25.69° and 115.82 kPa, respectively. According to the FESEM results, the matrix microstructure was detected for the soil. The O, Al, Si, and Fe were detected as primary chemical elements in the soil. The results of this study can help the practitioners to classify the laterite soil and decide based on its characteristics.

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“…Laterite is a brownish yellow and brown regional special clay formed by physical and chemical weathering of carbonate rocks (or rocks rich in iron, silicon, and alumina) under humid and warm subtropical climate [1][2][3][4], which is widely distributed in Guangxi Zhuang Autonomous Region in southern China [5,6]. Due to the special engineering properties of laterite, such as high void ratio, high water content, hard top and soft bottom, loss of water shrinkage, and cracking [7][8][9][10][11][12][13], it is easy to induce insufficient foundation bearing capacity, ground collapse, slope cracking, uneven settlement, and other project problems [14][15][16][17]. In addition to the disturbance of the stratum developed by the laterite, the unique mechanical properties of the laterite seriously threaten the safety of engineering construction and bring a lot of inconvenience to the construction process [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microscopic Properties of Graphite/Laterite Nanocomposites

Gao

Zhang³

et al. 2021

Advances in Materials Science and Engineering

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The effectiveness and improvement mechanism of graphite nanoparticles (GN) in strength properties and microstructure characteristics of regional laterite were analysed in this study. Dry density was also taken into consideration, and the effects of graphite nanoparticle (GN) content and dry density were mainly addressed. Triaxial tests, consolidation tests, and penetration tests were used to analyse the effectiveness of different dry densities and graphite nanoparticle mass ratios on the properties of laterite; microscopic methods such as scanning electron microscopy (SEM) tests were used to analyse the improvement mechanism. The results show that the increase in dry density can make the laterite more compact. The large specific surface area and nanoeffects of the graphite nanoparticles (GN) induce the attraction between soil particles after mixing, both of which make the laterite’s shear strength; compression index and impermeability have been enhanced to varying degrees. The microscopic tests showed that, as the content of graphite nanoparticles (GN) continues to increase, when it exceeds 1.0%, the attraction between soil particles increases and coarse particles are formed, which leads to the increase of the pores of the soil. In addition, the graphite nanoparticles have a certain degree of lubricity, a high amount of graphite nanoparticles enters the laterite soil layer, increasing the distance and gap between the layers, making it easy to separate the coarse particles from the coarse particles, and the strength increase is reduced. However, it is still stronger than that of the plain laterite.

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Reliability-based assessment of compacted lateritic soil liners

Cited by 14 publications

References 20 publications

Statistical Distributions of Hydraulic Conductivity from Reliability Analysis Data

Statistical Distributions of Hydraulic Conductivity from Reliability Analysis Data

Characterization of lateritic soil based on literature and lab testing

Mechanical and Microscopic Properties of Graphite/Laterite Nanocomposites

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