Dynamic damage and fracture characteristics of granite under …
The dynamic strength of the rock obtained in the impact tests is between 140 and 225 MPa, which is much larger than the compressive strength (122.2 MPa) under quasi-static loading. Here the ratio of the dynamic compressive strength to the quasi-static compressive strength is defined as DIF.
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The influence of microwave treatment on the compressive and …
They revealed that the uniaxial compressive strength of granite decreased from 88.17 MPa at 25 °C to 18.61 MPa at 800 °C. Between 300 and 600 °C, the decrease in the uniaxial compressive strength was associated with moisture releasing, quartz transition and thermal induced cracks, and 600–800 °C, the decrease was mainly …
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Frontiers | Numerical investigation of the influence of mineral
Conversely, the compressive strength shows a positive correlation with the Ro (degree of interlocking) of the grains. This implies that there is a tendency for the compressive strength to rise as the degree of interlocking among the grains increases. 3. The mesostructure of rock significantly influences the observed failure modes in …
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The rock cutting simulation of heterogeneous granite using FDEM …
Its parameters can be calibrated by uniaxial compression test (UCT) and Brazilian splitting test (BST) on granite [39, 40]. The UCT can calibrate the uniaxial compressive strength and Young's modulus of granite; While the BST can calibrate its tensile strength. The numerical simulation calibration models of the UCT and the BST …
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The Effect of Dynamic Stress Cycling on the Compressive Strength of Rocks
To constrain the high strain rate compressive strength and microcrack-driven failure processes of Westerly Granite under rapid stress cycling, we adapt a modified SHPB experimental approach introduced by Luo et al., which replaces the single, smooth compressive pulse with two successive pulses separated by a brief dwell time.
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Experimental study of the change of pore structure and strength …
Compared to the reference granite sample, the average uniaxial compressive strength and the elastic modulus of the rock samples after interaction also decreased. The uniaxial compressive strength of sample #1 and #2 both decreased by about 1%, and the elastic modulus of sample #1 and #2 decreased by 4–6%.
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An experimental study of the mechanical properties of granite after
Section snippets Specimen preparation. The granite used in this research was collected from an outcrop at the depth of 2 m in Nan'an City, Fujian Province, China.The diameter and the height of the specimens used for uniaxial compression were 50 mm and 100 mm respectively, in line with the recommendations of the International Society for …
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Rock mass properties
Brown failure criterion for jointed rock masses is defined by: (1) where and are the maximum and minimum effective principal stresses at failure, is the value of the Hoek-Brown constant m for the rock mass, s and a are constants which depend upon the rock mass characteristics, and is the uniaxial compressive strength of the intact rock pieces. a
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New approach for assessing uniaxial compressive strength of rocks …
A granite rock with higher quartz content and density (less porosity), along with a finer grain size texture, generally exhibits higher compressive strength (UCS) (Ghasemi et al. 2020; Sabatakakis et al. 2008). This may be the case with the granite sample investigated in this study showing much quartz-feldspar content along with …
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Experimental study on thermo-mechanical properties of Beishan granite
Fig. 2 (a) shows uniaxial compressive stress-strain curves of granite at different temperature conditions, and Fig. 2 (b) shows the peak stress and strain of granite under different temperatures summarized from Fig. 2 (a). As can be found in Fig. 2 (a) and (b) straightly that 150 °C is the temperature threshold of granite strength properties ...
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Dynamic Split Tensile Strength of Basalt, Granite, Marble
The aim of this study is to understand the strength behaviour and fragment size of rocks during indirect, quasi-static and dynamic tensile tests. Four rocks with different lithological characteristics, namely: basalt, granite, sandstone, and marble were selected for this study. Brazilian disc experiments were performed over a range of strain rates from ~ …
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Size-Dependent Behaviour of Hard Rock Under Triaxial Loading
A number of empirical and numerical studies have included size effects on the uniaxial compressive strength of different rocks, but only few have focussed on the triaxial compressive strength. In this study, several triaxial tests were conducted on granite samples at different confinements (from 0.2 to 15 MPa) and sizes (from 30 to 84 …
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Investigating the Effects of Mechanical Properties of Rocks
Rock properties such as uniaxial compressive strength, tensile strength, rock quality designation (RQD), plasticity, rock mass structure, and elasticity are controlled by an increase in rock joints. For instance, the insitu granite formations in Tables 2 and 3 (Katampe and Idu-Karimu) sites have inherent fractures which influenced an increase ...
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The Effect of Laser Irradiation on the Compressive Strength of Granite
2.2 Laser Irradiation Granite Specimen Test. The laser rock-breaking test platform used in this test is mainly composed of a continuous semiconductor laser and a three-axis CNC cutting platform, and the overall structure is shown in Fig. 2a. The laser has a maximum power of 5 kW and a wavelength of 915 nm, and the CNC cutting platform …
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An experimental investigation on fatigue characteristics of granite
Braunagel et al. 23, 24 used a modified SHPB device that can realize multiple compressive stress cycles within hundreds of microseconds to study the mechanical properties of rock and found that the dynamic strength of granite under a continuous load mode is only half of the rock dynamic strength in a traditional SHPB test.
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Size effect of mechanical characteristics of sandstone and granite
2. The size of cubic rock samples also has a significant influence on the uniaxial compressive strength. The uniaxial compressive strength of granite decreases linearly with the increase in size by up to 35%, showing an apparent size effect. The uniaxial compressive strength of sandstone increases linearly with the increase of its size by …
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Compressive strength of rocks
1 Estimating compressive strength. 1.1 Relating compressive strength to porosity; 1.2 Critical porosity; 2 Compaction …
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Predictive Modeling of the Uniaxial Compressive Strength of Rocks …
Sedimentary rocks provide information on previous environments on the surface of the Earth. As a result, they are the principal narrators of the former climate, life, and important events on the surface of the Earth. The complexity and cost of direct destructive laboratory tests adversely affect the data scarcity problem, making the …
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Experimental investigation into biaxial compressive strength of granite
This note reports the results of a series of biaxial compressive tests of granite cubes of sizes of 75, 100 and 125 mm. Testing was done with a newly developed biaxial test apparatus, housed in the Structural Engineering Laboratory of Henan Polytechnic University, China. It has a capacity of 500 metric tonnes in each direction and is equipped ...
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Article Experimental investigation on compressive strength
Distribution of Granite Rock Irradiated by a Moving Laser Beam. Appl. Sci. 2022, 12, 10681. https:// ... compressive strength of granite ranged between 120 and 140 MPa, with the main minerals ...
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Calculation for tensile strength and fracture toughness of granite …
Tensile strength and fracture toughness, important parameters of the rock for engineering applications are difficult to measure. Thus this paper selected three kinds of granite samples (grain sizes = 1.01mm, 2.12mm and 3mm), used the combined experiments of physical and numerical simulation (RFPA-DIP version) to conduct three-point-bending …
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Closed-Form Equation for Estimating Unconfined Compressive …
The use of three artificial neural network (ANN)-based models for the prediction of unconfined compressive strength (UCS) of granite using three non …
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Effect of Defects on Uniaxial Compressive Strength and Point …
Uniaxial compressive strength (UCS) and point load strength (PLS or Is(50)) are fundamental mechanical parameters in rock engineering. Investigating the relationship between UCS and PLS is also one of the important research contents in rock mechanics, however, the relationship is usually complex and changeable. This paper …
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Estimation of compressive strength of various stones based on …
This work examines the compressive strength of natural stones, as estimated by Uniaxial compressive strength tests (UCS) and respective non-destructive tests results (Schmidt Hammer Rebound test, SHR, or an Ultrasonic Pulse Velocity transmission, UPV). In practice, aiming to correlate the values of the UCS test with the …
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Prediction of uniaxial compressive strength of granitic rocks by
When compared with weak rocks, the number of studies on the prediction of uniaxial compressive strength of granitic rocks due to its high strength nature is low. …
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Study of physical and mechanical properties for some of Eastern …
The compressive strength test of granite is ranging from 1050 to 1358 kg/cm 2, for marble the results ranging from 827 to 1020 kg/cm 2. A dry density result of granite is 2.69 and marble dry density is 2.62. The obtained results confirm the suitability of studied samples as a decorative stones for building ornamentation and garden tiles ...
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Dynamic properties of granite rock employed as coarse …
Granite rock is widely distributed throughout the world, and there are large variations in the mechanical properties of granite extracted from various places – for example, the granite from the Tarim area of Xinjiang Province, China, has a static uniaxial compressive strength slightly less than 100 MPa [9]; however, granite from the ...
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Strength criterion for rocks under compressive-tensile stresses …
Numerous tests have been carried out to determine the strengths of rocks under confining pressure (CP), as rocks in-situ are usually under compression state. …
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STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES
Brown failure criterion for jointed rock masses is defined by: (1) where and are the maximum and minimum effective principal stresses at failure, is the value of the Hoek-Brown …
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The mechanical behaviour and failure modes of volcanic rocks
The microstructure and mineralogy of volcanic rocks is varied and complex, and their mechanical behaviour is similarly varied and complex. This review summarises recent developments in our understanding of the mechanical behaviour and failure modes of volcanic rocks. Compiled data show that, although porosity exerts a first-order …
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