Shear strength of granitic residual soil in saturated and unsaturated conditions

Rahman, Abdul Samad Abdul; Noor, Mohd Jamaludin Md; Jais, Ismacahyadi Bagus Mohamed; Sidek, Norbaya; Ahmad, J.

doi:10.1063/1.5062629

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…The graph presented in Fig. (5) demonstrates the pattern of all mixtures in comparison to the control sample, which shows significantly increased AEV. Table 3 presents the parameters derived from the fitting performance of the Van Genuchten (1980) model.…”

Section: Soil Water Characteristic Curve (Swcc)mentioning

confidence: 98%

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Exploring the Soil-water Retention Characteristics for Unsaturated Soil Using Coconut Shell Waste for Subgrade Improvement

Hafiz,

Kechik,

Ibrahim

et al. 2024

TOCIEJ

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Introduction Suction distribution has a major impact on the stability of unsaturated soil because it affects seepage and shear strength. The Air Entry Value (AEV) and Residual Water Content (RWC) variations determine the Soil-Water Characteristic Curve (SWCC), which is a crucial component of suction distribution. The subgrade is submerged in water during a flood event, which has an impact on the AEV and RWC, and lowers their performance. Crushed Coconut Shell (CCS), a waste product, has been recycled in this study and used as an addition to increase subgrade strength by enhancing AEV and RWC. Currently, researchers abroad confirm that CCS improves subgrade performance. Nevertheless, the optimum content of the soil-CCS mixture varies based on the soil type of the respective regions. Moreover, there is a lack of scholarly research examining the enhancement of AEV and RWC affected by CCS following a flood occurrence. Aim This research study sought to determine the deviations of AEV and RWC for the optimum CCS content of unsaturated soil in Malaysia. Methods In this research, control samples and soil mixed with 0.5, 1.0, 1.5, 2.0, and 2.5% of CCS were used. The pressure plate extractor equipment and analysis generate SWCC, which characterises the AEV and RWC parameters and quantifies the performance of submerged subgrade because of a flood event. Results The outcome revealed a significantly higher AEV for mixed soil as compared to the control sample. The AEV for the control sample was 10 kPa, whereas that for the optimum mixture of soil-CCS of 0.5% was 25 kPa. Therefore, it has been confirmed that the use of CCS has a positive impact on AEV and RWC. This, in turn, is expected to improve the overall performance of the subgrade when subjected to submersion in water. Conclusion The objective of this study was to assess the characteristics and potential applications of hazardous waste by transforming it into a soil improvement agent. This research supports Chapter 8 of the 12th Malaysia Plan 2021–2025: Environmental Sustainability: Improving Resilience to Climate Change and Disasters, and Chapter 6 of the Green Technology Master Plan Malaysia 2017–2030: Waste.

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Section: Soil Water Characteristic Curve (Swcc)mentioning

confidence: 98%

“…In order to comply with construction guidelines, the soil is altered with the purpose of improving its mechanical and hydraulic properties. The soil's condition can be improved by implementing either soil modification, soil stabilisation, or a combination of both methods [5].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Soil-water Retention Characteristics for Unsaturated Soil Using Coconut Shell Waste for Subgrade Improvement

Hafiz,

Kechik,

Ibrahim

et al. 2024

TOCIEJ

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“…Rainfall-induced landslides are the most common geohazards in the tropical and subtropical areas covered by granite residual soil, such as Brazil (Lacerda, 2007;Coutinho et al, 2019), Singapore (Rezaur et al, 2003;Rahardjo et al, 2008Rahardjo et al, , 2012Zhai et al, 2016;Zhang et al, 2019), Malaysia (Rahman et al, 2018), Korea (Kim et al, 2004;Pham et al, 2019), southern (Jiao et al, 2005;Fan et al, 2018;Luo et al, 2021;Liu et al, 2020aLiu et al, , b, 2021 and southeastern China (Xia et al, 2019;Yao et al, 2021;Shu et al, 2021;Zhao et al, 2021). Guangxi is located in southeastern China, where granite is concentrated in the southeast and landslides occur frequently (Liao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Failure mode of rainfall-induced landslide of granite residual soil, southeastern Guangxi Province, China

Zhao

Liao

et al. 2022

Earth Surf. Dynam.

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Abstract. Granite residual soil landslides are widely distributed in the southeast of Guangxi, China. They pose threats to local communities, economic development and ecological restoration. To understand the failure mode, the landslide can provide a scientific basis for early warning and prevention. In this study, we conducted artificial flume model tests to investigate the failure mode of granite residual soil landslide. The macroscopic phenomena of landslides were observed and summarized. The response and variations of soil moisture content and pore water pressure were analyzed. And the discrepancies in landslide initiation were explored. The results had three aspects: (1) the response of volume moisture content was not synchronized with that of pore water pressure. Their variations were influenced by initial dry density, slope angle and rainfall intensity. The fluctuation of pore water pressure depended on soil mechanical behavior and its diffusion. (2) The differences in the formation process of granite residual soil landslides included the initiation time and mode. The starting time of landslide was delayed with increasing initial dry density and slope angle but shortened with increasing rainfall intensity. The failure mode could be changed from a sudden type to a progressive type due to the increase in initial dry density. (3) There are five stages in the landslide mobilization as follows: rain infiltration and crack generation, soil slide at the slope toe, occurrence of surface runoff and soil erosion, formation of steep-free surface, and soil slide at the upper slope. This research can provide valuable reference for the prevention and early warning of granite residual soil landslide in southeastern Guangxi.

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“…Bedding plane shear stiffness is affected by rock surface roughness, overburden pressure, interface friction angle, interface cohesion, and other factors (Zuo et al, 2020). The main problem during the wetting and swelling of shale is that the bedding shear strength varies with swelling (Ikechukwu et al, 2021;Rahman et al, 2018). This variation in strength will directly affect the bearing resistance of the bedding layer and the joint shear stiffness of the bedding plane (El-Sohby et al, 2004;Fernandez et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Influence of Swelling on Shear Strength of Shale-Limestone Interface

El-Latif

Awad

Aly

2022

MGPB

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Rock slope stability is almost controlled by the behaviour of the interface between rock layers. The presence of shale layers between limestone layers complicates this behaviour. As the shale layer undergoes swelling with moisture, it causes the shear interface properties to change with a specific behaviour different from the dry state. The behaviour will depend on the shale’s degree of saturation, swelling percentage, and stress level over shale. An experimental program was carried out to determine the shear interface behaviour parameters of shale-limestone during swelling phenomena to guide stability checks. The interface cohesion and friction angle results are reported along the swelling process and compared with the dry state condition. These results help engineers assign adequate and accurate values for joint shear and normal stiffness in jointed rock slopes, including swelling layers.

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Shear strength of granitic residual soil in saturated and unsaturated conditions

Cited by 8 publications

References 5 publications

Exploring the Soil-water Retention Characteristics for Unsaturated Soil Using Coconut Shell Waste for Subgrade Improvement

Exploring the Soil-water Retention Characteristics for Unsaturated Soil Using Coconut Shell Waste for Subgrade Improvement

Failure mode of rainfall-induced landslide of granite residual soil, southeastern Guangxi Province, China

Influence of Swelling on Shear Strength of Shale-Limestone Interface

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