Influence of structure in the soil-water characteristic curves of two residual soils of granite

Heidemann, Marcelo; Bressani, Luiz Antônio; Gehling, Wai Ying Yuk; Flores, Juan Antonio Altamirano; Porto, Mattheus Souza

doi:10.1051/e3sconf/20160911002

Cited by 7 publications

(4 citation statements)

References 31 publications

(35 reference statements)

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“…Therefore, Grade VI residual soil could retain more moisture with higher matric suction than other materials. Heidemann et al [24] stated that the degree of weathering would not have a consistent effect on SWCCs [25]. Therefore, it is more likely that the parent rock type has a more significant influence on the SWCCs.…”

Section: Soil Water Characteristic Curve (Swcc)mentioning

confidence: 99%

The Application of Porous Material in the Capillary Barrier System for Residual Soil Slope Stabilization

et al. 2023

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A drainage system that is used to flow excess rainfall infiltration is an excellent alternative to enhance lateral diversion capacity at the interface of Grade VI and Grade V soil slope layers thus delaying breakthrough occurrences. This study aims to explore the performance of porous transport layer on slope behavior via numerical simulation by GeoStudio SEEP/W. In this study, a 2-dimensional non-homogenous residual soil configuration model, which is composed of Grade VI and Grade V residual soil was constructed. Laboratory tests were conducted on the soil samples collected from the Faculty of Engineering, UTM JB to determine the soil properties as input parameters in numerical modeling. The soil slope model is designed as an infinite residual soil slope according to Jabatan Kerja Raya (JKR) design specification on the cut slope and fill slope with 27 ° inclination respectively. High rainfall intensities were chosen to represent rainfall infiltration in Johor. The slope model was modeled with a porous transport layer at the Grade VI and Grade V layer interfaces. The porous transport layer is introduced as the transport layer and its effectiveness is expected to be similar to the optimum compacted soil mix in the previous study. In addition, porous concrete as a transport layer is introduced and it must meet the adequate porosity and hydraulic conductivity requirements. The suction distribution pattern with depth and time was subsequently observed to identify the volume of infiltrated water and retention time in the transport layer. The porous transport layer is also expected to be efficient in diverting infiltrating water and decreasing the interface's suction distribution between Grade VI and Grade V soil layers. HIGHLIGHTS The water built up within the residual soil slope is one of the common factors of rainfall-induced residual soil slope failure thus porous transport layer introduced The detailed laboratory testing and numerical modelling conducted in order to identify the performance of porous transport layer within residual soil slope The application of porous transport layer sandwiched between residual soil is effective to decrease the water built up and matric suction thus decrease the risk of slope failure GRAPHICAL ABSTRACT

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Section: Soil Water Characteristic Curve (Swcc)mentioning

confidence: 99%

The Application of Porous Material in the Capillary Barrier System for Residual Soil Slope Stabilization

et al. 2023

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“…In these areas, GRS is widely used as subgrade fill in highway construction for cost-effectiveness. Compared with undisturbed GRS, disturbed GRS usually exhibits strength decline because of residual fabric loss and microstructure change ( 2 , 3 ). Moreover, the high content of sand grains in some GRS favors the formation of higher porosity and permeability ( 4 ), which also favors water intrusion during rainfall.…”

mentioning

confidence: 99%

“…Previous studies have demonstrated that SWCC is closely related to the soil’s mineral component, microstructure, stress state, and initial void ratio ( 3 , 12 ). And the influence of stress state can also be attributed to the change in soil void ratio, pore size distribution (PSD), pore shape, and orientation ( 13 , 14 ).…”

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Laboratory Study on Entire Range Suction Measurement and Microstructure Change of Granite Residual Soil

Ling

Lin

et al. 2023

Transportation Research Record: Journal of the Transportation R

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The shear strength of unsaturated granite residual soil (GRS) will decline rapidly when moisture content increases, because of loss of matric suction in the soil. This can lead to slope instability and embankment collapse during rainfall. Determining the matric suction of GRS accurately at different conditions can improve the accuracy of stability analysis. Generally, matric suction can be characterized as the soil–water characteristic curve (SWCC), and it is closely related to soil microstructure. In this study, the entire range of matric suction was measured using a combination of pressure plate method, filter paper method, and vapor equilibrium method. Microstructure change was investigated based on mercury intrusion porosimeter tests, in which the pore size distribution (PSD) curves of GRS samples with different initial densities and moisture content were measured. The PSDs of samples before and after wetting were also measured and compared to investigate the influence of water intrusion. Test results indicate that the combination of measurement methods can cover the entire matric suction range. The microstructure of GRS with different initial conditions presents a clear bimodal PSD. At the same density, the increase in initial moisture content can increase intra-aggregate pores and decrease inter-aggregate pores. When initial density increases, only the volume of inter-aggregate pores decreases. Wetting can decrease inter-aggregate pores and increase intra-aggregate pores. Finally, the Li model is applied in SWCC fitting for tested samples, the result of which performs well with a high correlation coefficient (R2 > 0.95) and is recommended for GRS analysis.

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“…Utilizando o método do papel filtro, Heidemann et al (2016), durante a elaboração de Curvas de Retenção de Água, identificaram a relevância dos macro e microporos em dois solos, o primeiro de comportamento laterítico e o segundo saprolitico. Destacaram que, a porosidade é mais relevante em solos lateríticos.…”

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Análise de Curvas de Retenção de Água de Solos Reforçados com Fibras de Origem Animal

Ayala¹,

CARVALHO²,

Hernández³

2020

Congresso Brasileiro De Mecânica Dos Solos E Engenharia Geotécnica

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Uma propriedade importante do solo é a capacidade de retenção de água, em especial no estado não saturado. Utilizando o método do papel filtro determinaram-se as curvas características de amostras compactadas considerando-se 3 condições 0%, 0,25% e 0,50% de fibras em peso. Utilizou-se no estudo a fibra natural pena de frango. Os resultados indicaram a contribuição das fibras para a redução da retração do material. O teor de fibras de 0,25% não apresentou mudanças relevantes na curva de retenção, o teor de 0,50% permitiu destacar o papel dos vazios da pena como fator fortemente influente no solo em condições não saturadas.

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Influence of structure in the soil-water characteristic curves of two residual soils of granite

Cited by 7 publications

References 31 publications

The Application of Porous Material in the Capillary Barrier System for Residual Soil Slope Stabilization

The Application of Porous Material in the Capillary Barrier System for Residual Soil Slope Stabilization

Laboratory Study on Entire Range Suction Measurement and Microstructure Change of Granite Residual Soil

Análise de Curvas de Retenção de Água de Solos Reforçados com Fibras de Origem Animal

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