The mechanical properties of sandstone specimens can be affected by different high-humidity environments and high-humidity action time. With the increase of humidity, the triaxial compressive strength, residual strength, elastic modulus, and dilatation initial stress of the specimen under the same confining pressure all decrease in different ...
We 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, …
Experimental Study of the Mechanical Properties of Feldspar Sandstone. After the test at each gradient was completed, a uniaxial compression test was carried out on the dry feldspar sandstone sample. At the same time, speckles were prefabricated on the relatively smooth lateral surface of the feldspar sandstone, and the evolution of the …
High geothermal temperatures appear to be unfavorable for tunnel constructions in layered sandstone rocks with large overburden. The main objective of our research was to investigate the anisotropic mechanical characteristics of layered sandstones at various levels of geothermal temperature, to find answers to the following …
Moreover, the granular structure is weakened and loosened, resulting in degradation of the mechanical properties of the sandstone samples. As the pH value increases, the degree of grain corrosion ...
Red sandstone was selected for the study and specimens were prepared at 0°, 30°, 45° and 60° fracture inclinations and maintained in an acid solution at pH = 2. The specimens were subjected to uniaxial compression tests before and after maintenance to obtain the mechanical parameters and to observe the damage properties of the …
The TGR sandstone samples investigated in this study are collected from Zigui County, Hubei province of China, a landslide-prone region in the Three Gorges Reservoir region (Fig. 1) (Li et al. 2019).An accurate estimation of rock properties considering the influence of cyclic wetting–drying of Yangtze River water can contribute …
The peak stress of sandstone under load decreases gradually after the action of temperature, and the impact of temperature change on the internal composition …
Here are some key points about sandstone: 1. Sandstone is a sedimentary rock composed mainly of sand-sized mineral particles or rock fragments. 2. Sandstone can be classified based on composition (e.g. quartz arenite, arkose, lithic sandstone) and texture (e.g. well-sorted, poorly sorted, …
The research revealed the deterioration of mechanical properties of sandstone after different numbers of drying-wetting cycles and elucidated the evolution mechanism of pores in sandstone with the increasing number of cycles. More importantly, the damage variable of sandstone based on changes in energy dissipation was defined …
The mechanical properties of sandstone are greatly affected by grain size. Wasantha et al. (2015) and Yu et al. (2017, 2021) investigated the strain rate effect on deformation behaviors of sandstones with different grain sizes.
In order to investigate the physical and mechanical properties of sandstone containing fissures after exposure to high temperatures, fissures with different angles α were prefabricated in the ...
The mechanical properties of rocks are significantly affected by chemical corrosion. To explore the influence of chemical corrosion on the weakening laws of sandstone mechanical properties, the porosity and pore size distribution (PSD) of sandstone samples immersed in different chemical solutions was measured by the …
Estimating mechanical properties of sandstone from petrographic and physico-mechanical indices. September 2019. Conference: 53rd U.S. Rock …
Sandstone is widely distributed in the earth's crust. Due to its porous structure, it can be used in oil and natural gas storage, and carbon dioxide sequestration in recent years (Klein et al. 2001; Ma and Haimson 2016). Therefore, a comprehensive understanding of the mechanical properties of sandstones is essential in these …
This paper experimentally studies the variation of pore characteristics and mechanical properties of sandstone at different temperatures (from 25 °C to 600 °C).The results show that the sandstone samples mainly have holes with diameters between 0.7 μm and 3 μm and at threshold diameters of 0.01 μm and 3 μm, the cumulative pore …
In this study, to quantitatively analyse the pore structure and mechanical properties of sandstone after treatment at different temperatures (25 °C, 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, 800 °C, and 900 °C), an experiment was conducted based on nuclear magnetic resonance. The variation laws of the size and …
The results indicate that the mechanical properties of sandstone deteriorate significantly upon immersion, but the rate of deterioration decreases with increasing immersion height. The use of stronger and more cohesive filling materials can improve the mechanical properties of fissured sandstone, but there remains a gap …
3 Variations of Mechanical Properties. Normalized values of elastic moduli ( E/E 0 ), compressive strengths ( σ c /σ c0) and tensile strengths ( σ t /σ t0) for …
The mechanical properties of sandstone with different saturations under freezing temperature and after one ultralow temperature freeze–thaw cycle test conditions were investigated in this study. The uniaxial compressive strength (UCS) of both dry and saturated samples increases with the decrease in temperature except at − 90 °C under ...
The effect of immersion time on the pore structure, mechanical properties and fracture development form of sandstone is studied, and finally the weakening …
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 …
To study the differences in mechanical properties and failure characteristics of underground chambers surrounding rock under different stress conditions, triaxial loading and unloading tests were ...
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 influence of the variation in coarse-grain content on the mechanical properties of coarse-grained red sandstone soil. Soil with a grain size …
The testing results revealed that the mechanical properties of the interbedded sandstone were significantly influenced by stress levels and structural anisotropy. The Young's modulus of sandstone at a loading angle of θ = 0° was greater than that at θ = 90°, and both were apparently greater than that at θ = 30°. The variation …
The mechanical properties of sandstone treated with different types of chemical corrosion will deteriorate. Under static and dynamic states, the compressive strength and elastic modulus decrease, and the failure strain increases after treatment with chemical corrosion. The corrosion of chemical solutions results in a weakening of the …
In this paper, an experiment is carried out to acquire the dynamic mechanical properties of a simulated sandstone tunnel by a dual DIC system. The sandstone tunnel is simulated by large sandstone with a prefabricated hole in the center. The speckle size required by DIC system was evaluated, and the results showed that for large specimens …
This study examines the dynamic mechanical properties of coal measures sandstone after thermal treatment by means of an MTS653 high-temperature furnace and Split Hopkinson pressure bar test system. Experimental results indicate that 500 °C is a transition point for the dynamic mechanical parameters of coal measures …
An experimental study has been carried out as part of a wider programme of research in order to examine some of the physico-mechanical properties of the Jiaozuo Sandstone after exposure to extremely high temperatures. The mechanical properties of the rock under examination are discussed before the results of the thermo-mechanical …
Experimental design. The main research direction of this test is the difference of physical and mechanical properties, AE signal and microstructure of saturated sandstone samples after different ...
