Experimental study on mechanical properties
The improved MTS815 Flex test GT rock mechanics system and acoustic emission (AE) technology were utilized for the triaxial compression with permeability test of limestone from coal measures strata of TCS tunnel. The results indicate that gas pressure and confining pressure significantly affect the mechanical properties and permeability of ...
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Frontiers | Uniaxial Compression Damage Mechanical …
The paper studies the uniaxial compression mechanical properties of pillars under the deep and high-humidity environment. We make the pillars cored from the −750 m mine room of Wengfu Phosphate Mine into the standard dolomite samples and test with a humidity control device developed by ourselves. Combining with uniaxial compression …
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Strength Characteristics of Reef Limestone for Different …
the uniaxial compression test was carried out indoors by using the rock samples of corresponding cementa-tion type, and the relationship between the two ... reef limestone began in the 1970s in China, and these studies focused on the physical and mechanical properties of reef limestone (Wang 2008; Wang
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Frontiers | Deformation of Steel Slag Asphalt Mixtures …
To study the deformation resistance of steel slag asphalt mixtures (SSAMs) under rainy conditions, limestone–asphalt mixtures (LAMs) and SSAM were soaked in water at room temperature for 120 days and rutting tests and triaxial compression tests were carried out. The results show that the deformation resistance of SSAM was improved after 120 days …
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Frontiers | Experimental study on the hydraulic …
Laminar argillaceous limestone continental shale is an important oil reservoir in Jiyang Depression, Bohai Bay Basin of China. Affected by the laminar structure, the spatial propagation morphology of …
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Review of Particle Breakage Measurement Methods for
In order to better understand the particle breakage mechanics and characterization methods of calcareous sand, the particle breakage characteristics of calcareous sand in one-dimensional compression tests, isotropic compression tests, triaxial shear tests, and ring shear tests are reviewed and analyzed. The results show …
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Crack Initiation and Damage Evolution of Micritized …
Triaxial compression tests are conducted for the micritized framework reef limestone, which is sampled from a reef island in the South China Sea. The lateral strain response method (LSR) is applied to figure out the crack initiation stress of the reef …
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Results of the triaxial compression test
Triaxial compression tests are conducted for the micritized framework reef limestone, which is sampled from a reef island in the South China Sea. The lateral strain response method (LSR) is...
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(PDF) Strain Rate Effect on Acoustic Emission
e uniaxial compression test of the karst limestone was. conducted under different static strain rates (5 ... rock impulsion dynamics," West-China Exploration Engi-neering, ...
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Frontiers | Research on creep characteristics of loading and …
The hard Flint limestone of Shuibuya hydropower station underground construction cavern is utilized as a research object to investigate the creep problem caused by excavation of rock masses such as caverns. In order to perform a triaxial compression grade-unloading creep test, the actual adjustment path of stress during excavation of …
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Mechanical behavior of limestone in natural and forced …
device, limestone specimens are prepared for uniaxial compression tests to discuss the relationship between the forced water saturation treatment and the mechan-icalpropertiesofthespecimens.Therecordedacoustic emission events are also used to describe the damage degree of the limestone specimens. 2 Experimental work 2.1 …
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Study on Physical and Contact Parameters of Limestone by …
For the compression test, the limestone specimen was cut into a cylindrical block and placed in the . ... Journal of China Coal Society, Vol.34, No.6, 2009, pp.7 56-76. (In Chinese)
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Investigation on the mechanical behavior, …
Triaxial compression coupled with permeability tests of limestone were carried out. •. Mechanical properties of limestone under stress-seepage coupling were …
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Experimental Study on Damage Behavior of Porous …
The mechanical properties and damage behavior of coral limestone collected from the Zhongsha Islands, South China Sea were investigated based on the …
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Mesoscopic damage evolution of coral reef limestone
CT technology was applied to the real-time scanning triaxial compression test of CRL specimens to observe the change in pore structure across multiple sections. ... Crack initiation and damage evolution of micritized framework reef limestone in the South China Sea. Rock Mech. Rock. Eng., 54 (2021), pp. 5591-5601, 10.1007/s00603-021 …
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Modification and Application of Limestone HJC
The RMT-301 rock and concrete mechanics test system developed by the Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, was used to …
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Experimental study on the mechanical and permeability
We conduct triaxial compression tests on the limestone under hydro-mechanical-coupled condition to investigate the failure mechanism and permeability characteristics. ... This study was financially supported by the Natural Science Foundation Project of China (No. 41772282), the Taishan Scholars Project Foundation of Shandong …
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Applied Sciences | Free Full-Text | Study on the Effects of
Water can deteriorate the compositional properties of rock through softening and dissolution. The water content rate of rock has a certain effect and can cause changes in rock properties caused by the water action. In this research, to study the effects of the water content rate on the strength and brittle plasticity of limestone, uniaxial …
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Nonlinear time series analysis of limestone rock …
We obtained basic data for AE time series analysis by simple uniaxial compression and AE testing. 2.1. Properties of limestone. We obtained limestone …
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Mechanical Characteristics and Failure Mechanism of Siltstone
3.2. Influence of Joint Thickness on Mechanical Parameters. Table 1 lists the mechanical parameters of the tested specimens under uniaxial compression, where is the uniaxial compression strength (UCS), is the strain at UCS, E is the elastic modulus, and is Poisson's ratio. The average UCS was 80.78 MPa for DFS, 22.97 MPa for DFC, and …
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Study of the internal re-breaking characteristics of broken limestone
The self-designed broken rock-coal compression device which is made of a high-strength steel alloy can provide the test conditions for axial loading and hoop. Holistic compression deformation characteristics of broken limestone. Fig. 4 shows the stress–strain-axial compression displacement curve for 2.5–5 mm broken limestone …
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Damage evolution of phyllite based on uniaxial compression …
Qin and Yang studied the rock acoustic emission test technology and the uniaxial compression damage evolution test of limestone and concluded that the number of AE events is a direct ... (2010) Experimental investigation of damage evolution of Huanglong limestone under uniaxial compression. China Civil Eng J 43:117–123. …
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Experimental study on compression mechanical …
After the specimens are selected, a self-made simple drop hammer impact device shown in Fig. 2 is used to conduct pre-impact test on the filled jointed rock specimens. During pre-impact loading ...
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Strength Characteristics of Reef Limestone for Different Cementation
The mechanical properties and damage behavior of coral limestone collected from the Zhongsha Islands, South China Sea were investigated based on the results of uniaxial compression tests.
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Experimental Investigation of the Static and Dynamic Compression …
In the current work a new equation for initial damage assessment of limestone based on plane strain theory is proposed. Detailed investigations of the static and dynamic characteristics of limestone with different initial damage degree, using longitudinal wave speed, and static-dynamic compression tests are performed. This …
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Experimental Study on Dynamic Performance of Rock-Concrete
In order to study the influence of different thickness ratios on the mechanical properties of rock-concrete composite, a 50 mm diameter split Hopkinson pressure bar device (SHPB) was used to conduct impact loading tests on ϕ 50 mm × 50 mm cylindrical composite with sandstone thickness of 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50 mm.
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ClassificationandFractalCharacteristicsofLimestoneFragments
In this study, based on fractal theory and a series of tests using the MTS815.02 rock mechanics test system, the classification and fractal characteristics of limestone specimen fragments are in-
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Hydromechanical coupling tests for mechanical and …
To clarify mechanical and permeability characteristics of fractured limestone in complete stress–strain process, the hydromechanical coupling tests with various differential water pressures and ...
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Strength Characteristics of Reef Limestone for Different
The uniaxial compression test was carried out on the RMT multi-functional rock rigidity testing machine (Fig. 3) independently developed by the State Key Laboratory of Geomechanics and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences.The maximum vertical loading of the instrument can reach 1000 kN, the vertical …
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Water-Weakening Effects on the Strength of Hard Rocks at …
Uniaxial compression tests at five loading rates (0.01, 0.05, 0.1, 0.5, and 1 mm min −1) were performed on marble and limestone under dry and saturated conditions. Based on theoretical and experimental investigations, the …
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