Effect of Coarse Materials Percentage in the Shear Strength

Alshameri, Badee; Bakar, Ismail; Madun, Aziman; Abdeldjouad, Lokmane; Dahlan, Samsul Haimi

doi:10.1088/1757-899x/136/1/012017

Cited by 10 publications

(8 citation statements)

References 19 publications

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“…The density also influences the soil shear strength as the soil shear strength improves with an increase in its density [13,14]. Previous studies focused on studying the strength characteristics of soil under the framework of maximum dry density and optimum moisture content achieved in laboratory testing [15].…”

Section: 𝜎′=(𝜎−𝑢𝑎)−𝜎𝑠 (3)mentioning

confidence: 99%

Effect of the optimum and residual moisture content on the strength characteristics of unsaturated sands

2023

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Soil exists mainly in unsaturated conditions. Therefore, accurate prediction of the soil shear strength for unsaturated conditions also becomes equally important for the geotechnical design of earth structures. This study primarily investigates the effect of the moisture content of unsaturated soil on its shear strength. The strength characteristics of silica sands with different grain sizes were studied using the modified triaxial apparatus and analytical methods. For this purpose, four series of triaxial compression tests on silica sands were performed by varying the moisture content of the test sample at compaction and shearing as optimum or residual moisture content. The test results showed that the test sample sheared at optimum and residual moisture content exhibited higher shear strength when the sample was initially compacted at residual and optimum moisture content, respectively. The moisture content at compaction and the soil grain size considerably influence the shear strength of unsaturated sandy soils. Furthermore, the analytical method used in this study for unsaturated soil shear strength prediction does not account for the effect of initial moisture content in predicting unsaturated soil shear strength.

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Section: 𝜎′=(𝜎−𝑢𝑎)−𝜎𝑠 (3)mentioning

confidence: 99%

Effect of the optimum and residual moisture content on the strength characteristics of unsaturated sands

2023

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“…The results showed the importance of soil friction angles and soil density, where changing either in normal or reverse faults has a high impact on tunnel displacements. The results can be explained by a laboratory test on soil stability, which showed that increasing the friction angle decreases the settlements and also increases the shear strength in soil [40,41]. as sharp as under a reverse fault condition.…”

Section: Effects Of Fault Angle On Displacementmentioning

confidence: 99%

A Novel Experimental Study on the Effects of Soil and Faults’ Properties on Tunnels Induced by Normal and Reverse Faults

et al. 2020

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Due to the world population increasing considerably, there is a need for efficient public transportation, such as the subway. However, it has become a major concern to geotechnical engineers that the development and construction of subways are held underground where faults exist, as it will be a major risk to any structure if the fault is still active. Several seismic events, such as the earthquakes in Taiwan in 1999, China in 2008, and Malaysia (Sabah) in 2015, caused by fault ruptures, signify the importance of this study. In this paper, a physical model of 1000 mm in height, 3000 mm in length, and 1000 mm in width, which is the largest single gravity (1g) model for simulation faults (normal and reverse) ever built, was fabricated to evaluate the influence of various soil properties, various fault angles, and tunnel depths on tunnels affected by normal and reverse faults. The effects of various soil properties, such as water content, particle size, cohesion, and friction angle, had revealed major changes (approximately by 34%, 39%, 64%, and 39%, respectively) in tunnel displacements. Results also showed that increasing of fault angle could increase the tunnel displacement as much as two times. In addition, when a tunnel is located close to the ground surface, 22% less displacement was found to have occurred to the tunnel. With the results obtained from the physical model, simulation had been made using plane strain and axial symmetry (PLAXIS) software. The comparison made between rock and soft soil showed that soft soil imposed two times more displacements than rock, and an existence of foundation in soft soil and rock can decrease the tunnel displacements by 6% and 4%, respectively. This paper asserts that besides the structural design of a tunnel, the geotechnical design also has a major impact on the safety and robustness of the tunnel, in which aspects such as soil properties, tunnel depth, and fault angle have a strong influence on tunnel damages which were not considered in previous research, despite their importance.

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“…The friction angle of claystone material under wet conditions is lower than that under dry conditions [17]. The physical properties of clastic sedimentary rocks have a strong correlation with their mechanical properties [18]. Therefore, the moisture contents of claystone and sandstone increase rapidly at the beginning of exposure.…”

Section: Introductionmentioning

confidence: 97%

The Correlation of Exposure Time and Claystone Properties at the Warukin Formation Indonesia

Supandi¹

2018

GEOMATE

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The deterioration of claystone material was studied by observing a mine slope after digging. An understanding of the degradation of material properties based on field characteristics was required for a detailed slope stability analysis. Experiments were carried out to investigate the correlation of exposure time and the degradation of the mechanical properties of claystone. The methods used in this research include direct field observation and measurements taken from samples of claystone. Claystone samples with different exposure times were obtained from the mine slope face. The exposure time was calculated from the time the slope was dug (when mining started). Determination of the mechanical properties was conducted using undrained, unconsolidated triaxial testing and uniaxial testing. Statistical analysis was carried out to determine the mineralogical homogeneity of the claystone. An empirical analysis was carried out by plotting the exposure time against the mechanical properties on a scatter diagram. The degree of correlation was one parameter used to determine the relationship between the exposure time and material behavior. Based on the results of the research, it is known that the time span of exposure correlates strongly with material properties due to weathering and degradation. The decline in strength was accelerated after the material is exposed. Strength gradually decreased to moderate after 200 days of exposure. Furthermore, the mechanical properties of claystone material will be stabilizing after 400 days. The results of the analysis were very important in predicting the behavior of claystone with exposure time on a slope.

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Effect of Coarse Materials Percentage in the Shear Strength

Cited by 10 publications

References 19 publications

Effect of the optimum and residual moisture content on the strength characteristics of unsaturated sands

Effect of the optimum and residual moisture content on the strength characteristics of unsaturated sands

A Novel Experimental Study on the Effects of Soil and Faults’ Properties on Tunnels Induced by Normal and Reverse Faults

The Correlation of Exposure Time and Claystone Properties at the Warukin Formation Indonesia

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