Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
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This paper presents the hydro-mechanical behaviors of a red sandstone from the Three Gorges reservoir area using laboratory testing and numerical modelling. A series of laboratory triaxial compression tests were performed on the red sandstone to understand the effect of confining stress and seepage pressure on the rock mechanical …
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Sandstone is a common construction material widely distributed in mountain tunnels. Its stability determines the safety and service life of tunnel projects. The surrounding rock of the tunnel is subject to frequent fire incidents and long-term erosion by acidic groundwater throughout its entire life cycle. This study investigated the pore …
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It is found that the true triaxial mechanical properties of sandstone after high temperature treatment are closely related to temperature, and the peak strength, maximum principal strain, volume ...
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The mechanical properties and failure modes of concrete and sandstone under uniaxial compression were investigated. Failure characteristic analysis of single material The failure modes of the rock ...
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The effect of mechanical load and thermal treatment on sandstone specimen is numerically investigated. Based on Newton's second law, we established the rate- equation model of sandstone rock specimen under uniaxial mechanic load and fire. We introduce in the model the material nonlinear stress/strain relationship and the effect of …
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A chemical damage variable was proposed based on the porosity of sandstone and the order of effect of chemical solutions on pore structure and mechanical properties of sandstone was obtained as H 2 SO 4 solution > NaOH solution > distilled water. Finally, a decay model considering both of chemical damage and confining …
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To study the combined effects of freeze–thaw cycles and chemical corrosion on deterioration mechanism of triaxial mechanical properties of sandstone in cold regions, triaxial compression tests were carried out on homologous sandstone specimens after corrosion action of acidic, alkaline or neutral solution and cyclic freeze–thaw action, …
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To better understand the acid-temperature coupling mechanism, it is critical to quantify the coupled effects of acid and temperature on the damage characteristics of sandstone. In this paper, macroscopic mechanical properties and microstructure changes of sandstone samples under different acid-temperature conditions are obtained by …
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A test and a calculation model for sandstone under thermal–hydrological–mechanical (THM) coupling were proposed to reveal the mechanical properties of sandstone. The law of coupling for ...
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The study on the evolution of mechanical properties of sandstone with temperature provides a theoretical basis for the extraction of mineral resources in deep sandstone formations and post-disaster engineering construction. 2 Materials and methods 2.1 Sample preparation. To ensure the accuracy of the experimental results, samples were taken ...
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The mechanical properties of bedded sandstone, including its compressive strength and elastic modulus, first increase and then decrease with increasing temperature, and a thermal temperature of 400 °C was identified as the transition temperature, above which considerable changes in the mechanical properties were observed. ...
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The mechanical properties of deep rocks are obviously affected by the initial unloading level and water pressure environment. By carrying out triaxial compression tests and unloading tests on ...
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Molding process has a strong influence on the mechanical properties of bio-sandstone, because different molding methods could affect the microbe content absorbed in sand column so that the precipitated calcite and pore content are different in bio-sandstone. It is better to use pumping molding procedure than non-pressure molding, …
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To explore the effects of salt weathering on these sandstone structures, the physical and mechanical properties of the sandstone samples were examined after a wetting-drying process. In comparing the results of the samples soaked in water and the samples soaked in a solution with MgSO 4, MgSO 4 was found to have a significant …
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In addition, the influence of the anchor bolt on the mechanical properties of SC specimens is also considered. The results show that the mechanical parameters of the SC and sandstone–coal–bolt (SCB) specimens are different from those of other intact rocks and are substantially affected by the angle.
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The mechanical properties of red sandstone corroded by acid solutions deteriorated due to a complex process involving various physicochemical effects. Certain voids were formed in the natural rock by physical action. A water film formed on the mineral particles as a result of the acid solution's entry into these voids. This water film ...
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To investigate the long-term degradation in rock mechanical properties under the coupling effect of dry–wet cycles and acid solutions, the physical test, uniaxial compression test, and scanning electron microscopy test were carried out on the red sandstone treated with different dry–wet cycles in the three solutions. The variations in …
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Mechanical properties of sandstone, such as compressive strength and young's modulus, are commonly used in the design of geotechnical structures and numerical simulation of underground …
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Yi et al. established a two-media and two-body two-mechanical model to study the mechanical properties of the interface between the two media by relative experimental tests . Shen et al. studied on meso-debonding process of the sandstone–concrete interface induced by freeze–thaw cycles using NMR technology [ 23 ].
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As a good building material, natural stone is widely used in projects such as houses, bridges, and tunnels. Sandstone has the characteristics of easy access, easy processing, good durability, and excellent mechanical properties, and the use of sandstone can be seen in buildings around the world [1,2].Due to sedimentation and …
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Abstract. An experimental investigation was carried out on the Hawkesbury sandstone to study changes in mechanical rock behavior (i.e., strength and deformability) during various cyclic loading conditions under uniaxial and triaxial testing situation. Axial load, confining pressures and axial and lateral deformations were measured continuously …
DetailsWe investigate herein the role of acidic dry-wet cycles and dynamic loading on the mechanical stability of sandstone, which is crucial for managing closed and abandoned mines' safety. Using a split Hopkinson pressure bar, we conducted dynamic compression tests on sandstone samples exposed to four acidic conditions (pH = 3, 5, …
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The mechanical properties of marble, limestone, and sandstone as well as the stress-strain curve, the varying characteristics of the peak strength, the peak strain and elastic modulus were studied by …
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Coarse-grained red sandstone soil is often used as embankment filling material but is prone to being broken by extrusion, which lowers the stability of the roadbed. This paper aimed to clarify the …
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ABSTRACT. Fracturing fluid is the main cause of reservoir damage during hydraulic fracturing. Fracturing fluid will change the mechanical properties of reservoir rock, and the effect of proppant-propping hydraulic fractures will be affected. To study the changes and internal mechanism of sandstone mechanical properties after guar gum …
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Abstract: In this study, the water absorption, mechanical properties, and energy evolution characteris-tics of sandstone were examined through experimental and theoretical analysis. The P-wave ...
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The results showed that the selective adsorption of mineral compositions of sandstone on CO 2 /N 2 /H 2 O has obvious effects on mechanical behaviors. The linear elastic modulus of CO 2-H 2 O coupled sandstone was slightly greater than that of H 2 O-bearing sandstone, but significantly less than that of CO 2 - or N 2-bearing sandstone.
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Khandelwal & Jian Zhou (2023): Dynamic compression mechanical properties of sandstone. supported by Thin Spray-On Liner, Mechanics Based Design of Structures and Machines, DOI: 10.1080/15397734. ...
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