Mechanical Properties and Failure Mechanism of Sandstone …
Mechanical Properties and Failure Mechanism of Sandstone with Mudstone Interlayer Chengxiang Wang1, Huailiang Kou1, ... experimental to study the mechanical properties of sandwich rock. Wang et al [7] conducted triaxial tests on three sandstones and the deformation, strength and failure characteristics of three sandstones (white ...
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(PDF) Analysis of Mechanical Properties of Sandstone under …
This paper studies the change of physical and mechanical properties of sandstone after freeze-thaw (F-T) cycle treatment. Firstly, the effects of the freeze-thaw treatment on the P-wave velocity ...
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Experiment study of physical and mechanical properties of sandstone
To study the effects of temperature cycles on the mechanical properties, thermal damage, and fracturing of sandstone, uniaxial compression tests and Brazilian splitting tests were performed using a hydraulic pressure servo rigidity rock mechanics experiment system. Before the tests, the sandstone samples were treated with cyclic (repeated from 0 to 8 cycles) …
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Tensile Fracture Behaviour of Stratified Sandstone Under Static …
The BST results indicate that sandstone bedding has an important effect on the mechanical properties of sandstone; this enables the study of the sandstone's microfracture …
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Identification of changes in mechanical properties of …
Material properties largely depend on their structure, and are strongly dependent on the scale of observation. Under the influence of various processes, the structure of a material can undergo evolution, which leads to …
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Study of mechanical characteristics and damage mechanism of sandstone
The microscopic pore structure of sandstone gradually changes under long-term immersion, resulting in dynamic changes in the mechanical and damage properties of sandstone, which brings challenges to maintain the long-term stability of underground engineering.
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Evaluation of Thermophysical and Mechanical Properties of Sandstone …
In this study, thermophysical and mechanical tests were conducted on sandstone samples from room temperature to 1000 °C. Based on the test results, the thermophysical properties (such as specific heat capacity, thermal conductivity, and thermal expansion coefficient) of sandstone after high-temperature treatment and the variations of mechanical properties …
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Experimental study on changes of pore structure and mechanical
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 number of ...
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Mechanical Behavior and Damage Evolution Properties of Sandstone …
Sandstone specimens with varying parallel planar flaw angles are subjected to different freeze–thaw cycles and uniaxial compression tests. Effects of parallel planar flaws angles (θ) and freeze–thaw cycle (FTC) numbers on mechanical properties and damage evolution of sandstone specimens are investigated.A damage constitutive model based on energy …
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Experimental study of mechanical properties of sandstone at high
Mechanical properties of rock at high temperature are of importance for structure design and safety assessment in underground rock engineering. Brazilian disc test, axial compressive test and three-point bending test are adopted to determine the tensile strength σ t, uniaxial compressive strength σ c, elastic modulus E and Mode I fracture toughness K IC of …
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Evolution of micro-damage and degradation of macro-mechanical
Previous studies on thermal induced damage of rocks concentrated mainly on the analysis of macro-mechanical properties. This paper documents physical and microstructural characteristics of sandstone after high-temperature treatment by using several testing methods at the micro scale. Results indicate that physical including mechanical parameters of tested …
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Mechanical Properties of Sandstones under Initial Unloading …
To study the influence of initial unloading damage on the mechanical properties of sandstone, the repeated loading test of unloading damaged sandstone was carried out considering 8 initial unloading quantities of , 93.33%, 86.67%, 80%, 73.33%, 66.67%, 40%, and 0%. The results were compared with those of the triaxial compression test of ...
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The effect of temperature on the mechanical and hydraulic properties …
In carbonate rocks, no significant changes in mechanical properties were observed with varying temperatures, whereas in sandstone samples, these properties decreased as temperature increased. The compressional wave velocity decreased for all rock types as temperature increased due to the formation of thermal cracks and the expansion of intra ...
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Mechanical Properties of Acid-corroded Sandstone Under …
Long-term exposure to chemical solutions can change the mineral composition and microstructure and may seriously affect the physical and mechanical properties of rocks. Therefore, to clarify the effects of long-term exposure and types of acids on the mechanical properties of rocks, and to develop the constitutive model of acid-immersed rocks, uniaxial …
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Macro-micro mechanical properties of building sandstone under …
We aimed to study the macro and micro mechanical properties of building sandstone under different thermal damage conditions and evaluate its thermal stability. …
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Research on mechanical properties and acoustic …
In underground engineering, tunnels are important passages for underground wastewater, personnel and vehicles. As the surrounding rock usually experiences the splitting failure, the mechanical properties of the rock …
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Effect of Physical Properties on Mechanical Behaviors …
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 reservoirs using models …
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Mechanical properties and failure characteristics of sandstone …
Stress-time curves under ramp loading and unloading with different amplitudes and stress change rates were shown in Fig. 4. Equivalent loading rate represents the growth of the linear component of ramp stress signals. By comparing with the existing laws in the strength test of the rock mechanics sample, it can be …
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Experimental Study on the Changes to the Microstructures and …
Li et al. investigated the dynamic mechanical properties of heat-treated homogeneous coal-bearing sandstone, demonstrating that 500 °C was the transitional point for the dynamic properties of coal-bearing sandstone. When the temperature exceeded 500 °C, the dynamic elastic modulus and peak strength of the sandstone dropped sharply, while its ...
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Mechanical Characteristics of Red Sandstone Subjected to
2.2 Specimens' Preparation. This test includes the freeze–thaw treatment and physical and mechanical tests. The experimental instruments and flowchart are shown in Fig. 3.According to the recommendations of the Standard for test methods of engineering rock mass (GB/T50266-2013 2013), cylindrical specimens with 50 mm in diameter and 100 mm in length …
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Mechanical properties of sandstone under hydro-mechanical …
Study of mechanical properties of rock under hydro-mechanical coupling. The MTS815 rock mechanics system is used to perform triaxial compression tests of water …
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Mechanical properties and brittleness characteristics of sandstone …
Abstract The variation in rock mechanical properties with burial depth has always been a cutting-edge research topic worldwide. However, due to the difficulty in sampling from different burial depths, few studies have examined the change in rock mechanical properties with burial depth, especially in terms of the brittleness index. In this paper, 45 sandstone samples …
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Mechanical properties and damage evolution of sandstone …
The effect of freeze-thaw (F-T) cycles on the mechanical behaviors and internal mechanism of rock mass is a critical research topic. In permafrost or seasonally frozen regions, F-T cycles have adverse effects on the mechanical properties of rock mass, leading to many serious disasters in mining and geotechnical operations. In this paper, uniaxial compression tests are …
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Mechanical Properties of Weathered Feldspar Sandstone after
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 lateral ...
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Study on the mechanical properties of unloaded damage sandstone …
The results indicate: (1) The mechanical properties of sandstone, which has incurred damage and is not under load, are significantly impacted by cycles of drying-wetting and freezing-thawing. As the number of these environmental cycles increases, a descending trend becomes apparent in the stress-strain curve profile. ...
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Estimating mechanical properties of sandstone from …
In this study, a comprehensive literature review was performed to build a database containing petrographic and mechanical properties for sedimentary rock types. A subset of this database...
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Study on pore structure and the mechanical properties of sandstone
The freeze–thaw effect on the deterioration of the microscopic pore structure and mechanical properties of the sandstone-concrete binary has a similar effect pattern, in which the deterioration ...
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Mechanical Behavior and Acoustic Emission Characteristics of …
The mechanical properties, AE temporal and spatial characteristics of sandstone under different loading and unloading rates were investigated, and the damage evolution …
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Mechanical properties of sandstone under hydro-mechanical …
Mechanical properties of sandstone under hydro-mechanical coupling 9 The average porosity of the tested samples was 14.28%, the speci fi cr e s u l t sa r es h o w ni nT a b l e1,a n dt h ep o r ...
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Investigations of variations in physical and mechanical properties …
Then, according to the variation of physical and mechanical properties, the formation mechanism of damage is discussed and the damage process verified by the deterioration of mechanical properties. For rocks heated to different temperatures and eroded by acid solution, the main reason for damage is the increase of cracks which destroy the ...
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