Changes in the Physical, Mineralogical and Geomechanical Properties of a Granitic Rock from Weathering Zones in a Tropical Climate

Jaques, Daniel Silva; Marques, Eduardo Antônio Gomes; Marcellino, Lázaro Corrêa; Leão, Marcio Fernandes; Ferreira, Eduardo Pereira Silveira; Lemos, Carolina Crissafe dos Santos

doi:10.1007/s00603-020-02240-x

Cited by 14 publications

(5 citation statements)

References 19 publications

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“…The sandstone samples were obtained according to the weathering grade. The sandstone samples were divided into weathering grades as described by [15][16][17]. The samples of each weathering grade were first dried and then soaked in water for 48 hours, then dried naturally and followed by drying in the oven at 50°C for a period of time to evaporate the absorbed water.…”

Section: Methodsmentioning

confidence: 99%

Effect of Wet-Dry Cycling on the Microstructure of Various Weathering Grade Sandstone

Shah,

Hashim,

Rehman

et al. 2024

AMM

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This study investigated the effect of rock-water interaction on microstructural properties of various weathering grade sandstone. Sandstone samples were acquired from the Sor-Range coal mine area, Pakistan, and were investigated using a tabletop scanning electron microscope (SEM). The characteristics of microstructures from micrographs were obtained using ImageJ software. According to the findings an increase in wet and dry cycles significantly affects the microstructures (pore spaces and microcracks). The porosity and microcracks density of sandstone increases with the number of wet and dry cycles. Furthermore, the length of microcracks increases as the weathering grade increases. As variation in rock macroscopic mechanical characteristics is directly associated with the deterioration of microstructures. Therefore, analyzing the effect of water-rock interaction in various weathering grades of rock can offer a more accurate reference index for assessing the stability of geotechnical structures.

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Section: Methodsmentioning

confidence: 99%

Effect of Wet-Dry Cycling on the Microstructure of Various Weathering Grade Sandstone

Shah,

Hashim,

Rehman

et al. 2024

AMM

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“…To the west of this region there is a domain of high topography corresponding to an area of predominance of granitoid and gneissic rocks with the occurrence of sound rock pontoons that evolved through processes of differential erosion and concentric displacement. The Santa Angélica Intrusive Suite, the unit in which rock samples were collected, is located in this west area, which generates topographical overhangs with the occurrence of narrow valleys, strongly embedded, and steep slopes, where there are rock blocks and boulders elds (Jaques et al, 2020).…”

Section: The Study Area Characteristicsmentioning

confidence: 99%

“…approximately 10.0% of uniaxial compressive strength. The values of σ t correspond to approximately 8.77MPa and 9.87MPa for W1/W2 and W1, respectively, which re ect the effects of the degree of weathering in the tensile strength of rocks(Jaques et. al, 2020).…”

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confidence: 91%

Determination of direct tensile strength of rocks using a load converter

Baêsso,

Vargas,

Velloso

et al. 2024

Preprint

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The tensile strength of rocks is of great importance in many engineering and geophysical applications. Considered a key parameter in rock mechanics projects, its determination in the laboratory has been discussed for years by many researchers with two approaches: the direct tensile test, considered the ideal and most realistic, has its credibility compromised due to eventual poor execution issues; and, on the other hand, indirect tests, due to its practicality and dissemination around the world. In this context, the present work presents the results obtained with an equipment named compression to tension load converter (CTC), which allows the determination of the tensile strength of rocks in a direct and reliable way. A numerical analysis was carried out to study the stress distribution in the specimen during testing with the apparatus. Uniaxial compression tests, Brazilian and CTC tests were performed in a granitic rock from Southeastern Brazil, in order to compare the results obtained with results available in the literature. This work presents and discusses the results obtained with the CTC apparatus and compared them with results obtained with conventional indirect tensile strength tests.

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“…Several studies focused on the influence of weathering on rock matrix properties have been developed around the world, such as Dearman [3], Dobereiner & Porto [4], Pando et al [5], Marques et al [6], Jaques et al [7] and Marcellino [8], showing that weathering degree and alterability of rock matrix and rock masses can modify intact rock geotechnical characteristics and mechanical behaviour on field on medium to long term.…”

Section: Introductionmentioning

confidence: 99%

Geomechanical characterization and analysis of the influence of durability tests on metabasalts

Lemos

Costa

Silva

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Laboratory tests are essential to provide knowledge on rock matrix properties, to predict field behaviour and to plan and execute improved engineering design. The paper presents the results of several laboratory tests performed on samples of a basic rock from N4 mine, located at Carajás Complex, on sound and cycled (artificially weathered) rock material. Carajás complex is located in Carajás sierra, Amazon region, North of Brazil, and is currently known as the biggest mineral province of the world. This region has great geological and economical importance and, on this context, studies related to rock mechanics are essential to evaluate open pit stability on long term periods. This study comprises a mineralogical, physical and geomechanical characterization of a metamorphised basalt rock, throughout a comprehensive laboratory test campaign encompassing the following tests: thin section description (including micropetrographic and weathering indices determination), physical properties, uniaxial compressive strength, point load strength, P wave propagation velocity, Schmidt hammer and durability test (accelerated cycling). Results from other works in the literature are presented to provide a basis for comparison. Petrographic analyses allowed classifying the rock as a hydrothermalized metabasalts. Micropetrographic index has shown that rock presents low weathering, with a higher quantity of sound minerals. Porosity, dry and saturated specific weight and water absorption capacity were calculated for samples with and without cycling and the results show that the number of water – salt cycles were not sufficient to cause a significant change on these physical indices. Wave propagation velocities were determined and the results are similar to the ones found in literature for similar rocks. Schmidt hammer were used to determine uniaxial compressive strength (UCS) trough Miller abacus. Another strength tests performed on rock samples were point load test, and the results were also used to correlate with UCS and other studies results. All these results were later compared with uniaxial compressive strength tests data and the values were similar. Furthermore, data from UCS tests were also used to calculate elasticity (Young) modulus and the material has shown a highly elastic behaviour.

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Changes in the Physical, Mineralogical and Geomechanical Properties of a Granitic Rock from Weathering Zones in a Tropical Climate

Cited by 14 publications

References 19 publications

Effect of Wet-Dry Cycling on the Microstructure of Various Weathering Grade Sandstone

Effect of Wet-Dry Cycling on the Microstructure of Various Weathering Grade Sandstone

Determination of direct tensile strength of rocks using a load converter

Geomechanical characterization and analysis of the influence of durability tests on metabasalts

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