Mechanical properties and failure behaviour of anchored granite …
Granite samples were obtained from a large block of a stone mine in Zhangzhou City, Fujian Province, China. ... When the confining pressures were 0 and 40 MPa, the strength of the specimen with a fissure angle of 45° was the lowest among all specimens with different fissures. At confining pressures of 15 and 30 MPa, the strength of the ...
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Static compression behavior and strength weakening …
Therefore, taking into account such environmental influences on rock properties, it is one-sided and undesirable to use the undamaged original strength as a reference for mining designs [5], [6]. During blasting mining, rock blasting is generally repeated many times.
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Strength Characteristics and Double‐Yield Elastoplastic …
Abstract We characterized the strength and deformability of Wuyi granite based on Brazilian tests and axisymmetric compression tests under dif-ferent conning pressures (0, 5, 10, 20, 25, and 30 MPa). Facilitated by a modied three-dimensional (3D) Hoek–Brown strength criterion, the 3D strength envelopes of the granite in the principal stress space
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Calculation for tensile strength and fracture …
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 ...
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Precision granite and industrial products
The complete guide to granite properties, material and manufacturing considerations, insert …
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(PDF) Determination of the Direct Tensile …
The results revealed that water saturation generated important reductions in their uniaxial tensile strength (UTS), tensile elastic modulus (Et), Brazilian tensile strength (BTS) and point load ...
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Experimental investigation into biaxial compressive strength of granite
The calculated average biaxial strengths (σ 1) are 253, 251 and 239 MPa, with confining stress (σ 2) of 88, 83 and 79 MPa, for the 75, 100 and 125 mm samples, respectively. The biaxial failure strength decreases only by 0.8% going from 75 to 100 mm sample size, and by 4.9% from 100 to 125 mm.
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Impact strength characteristics of granite under combined …
Mechanical characteristics during static loading at different confining pressures. Figure 4 presents the stress-strain loading results of the granite sample at different confining pressures. When the applied air pressures are 0.25 MPa, 0.3 MPa, 0.35 MPa, and 0.4 MPa, the maximum strain rate is 125 s −1 and the minimum strain rate is 50 s −1 at confining pressures …
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Optimum Support Design for Openings Considering …
strength. I. INTRODUCTION Maddhapara Granite Mining Company (MGMC) which is the first experience of underground hard rock mining and second major mining project in Bangladesh. The MGMC lies between latitude 25 23'43" and 25 34'43" N and longitude 89 03'34"E and 89 05'04" E. It is about 23kms north east of Phulbari Railway station.
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Triaxial compression tests on a granite at different strain …
However, some researchers have found that the strain rate sensitivity seems to decrease with increasing confining pressure. For example, Ju and Wu [5] showed that the strength of a tuff increases by 40% and 20% under confining pressures of 0 MPa and 90 MPa respectively, while the strain rate changed from 10 −5 to 10 1 s −1.Similar experimental results …
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Influence of some rock strength properties on jaw crusher …
The results of the strength tests show that granite has the highest mean value of …
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granite vs basalt mpa
Popular materials processing machines barite processing plant feldspar stone processing plant slag processing plant calcite mining and processing plant granite stone ...
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Mechanical property and thermal degradation mechanism of granite …
The analysis in Section 5 demonstrates that the temperature threshold of the tested granite under the confining pressure of 30 MPa is 70 °C, which is similar to the values observed without confining pressure. 45 The AE activity of the Beishan granite measured under high-temperature triaxial compression (P c = 5,10,30 MPa, T = 23,60,90 °C ...
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In situ strength and failure mechanisms of migmatitic gneiss …
SKB conducted the in situ Äspö Pillar Spalling Experiment (APSE) in SKB's Äspö Hard Rock Laboratory (HRL), in Sweden, at the −450 m level. 10 The in situ spalling strength (also in situ rock mass strength) of Äspö diorite was found to be 122 MPa, which is ca. 58±4% of the UCS m (211 MPa). 10 Andersson back-calculated the maximum ...
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Hydraulic attachment tools in underground rock …
solidified lava or "magma" i.e. granite Sedimentary rocks - formed by deposition ... Rock excavation method according to compressive rock strength 0 20 Compressive rock strength (MPa) 40 60 80 100 120 140 160 180 200 220 240 260 12. ... have mining with the aim of extracting minerals from underground. At first, we excavate (non-valuable) waste ...
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Dilation in granite during servo-controlled triaxial strength tests
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 mm in diameter). The most relevant strength parameters were recovered including peak and residual strengths, orientation and frictional response of shear bands.
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Characterization of granite mining waste for geotechnical …
granite samples studied were 86 MPa, 132 MPa and 104 MPa, for collection points 1,2 and 3, respectively. The average minimum acceptable uni axial compressive strength of granites is 100 MPa for ...
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Deep neural networks for the estimation of granite materials
Nowadays, granite-mining techniques differ significantly from those of our ancestors. Computers, high-tech machinery, and new ways of managing staff have made the mining of granite more efficient than ever. 3. Materials and methods ... Unconfined compressive strength: UCS: MPa: Output: 24: 115.58: 198: 46.67:
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High-strength steel fibre-reinforced geopolymer concrete …
A limited number of research studies have managed to attain high-strength geopolymer concrete, especially by utilising waste materials. In this study, granite waste (GW) from the mining industry, which contaminates the surrounding environment and causes air pollution, and rice husk ash (RHA) from agricultural waste were used to produce high-strength …
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-Uniaxial compressive strength (MPa) of the test specimens …
Download scientific diagram | -Uniaxial compressive strength (MPa) of the test specimens Source: Authors (2021). from publication: Characterization of granite mining waste for geotechnical ...
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Thermophysical and Mechanical Properties of Granite and Its …
It is shown that the threshold temperature of strength and elastic modulus of granite are both …
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The influences of granite industry waste on concrete …
The flexural strength of l-concrete series with granite particle wastes varied between 3.6 MPa and 4.5 MPa, whilst that of the H-concrete series from 5.5 MPa to 6.3 MPa. It was clearly evidenced that the concrete with 50 % granite waste showed the lowest flexural strength that was some 8 % strength reduction as compared to conventional concrete ...
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Determination of the Direct Tensile Strength of Granite …
Symmetry, 2021. The objective of the current study was to compare results relating to the compressive and tensile strength of rocks obtained during research undertaken according to Polish Standards (as part of the European standards known as Eurocodes), American Society for Testing and Materials (ASTM) Standards, and the recommendations of the International …
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(PDF) Shear strength of bonded concrete-granite joints …
* 2 Methodology for the direct shear tests 2.1 Tested materials The concrete used was chosen based on the formula adopted in pre-existing concrete dams in France (Table 1) with an average compressive strength of 43.4 MPa and a tensile strength of 3.75 MPa. The chosen rock was granite since it is commonly found in dam foundations. Its mechanical ...
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(PDF) Strength Assessment of Concrete Cubes Containing …
The annual production rate of the Maddhapara Granite Mine is 1.65 million metric tons from the underground mine. ... The tests conducted pertain to concrete with river sand of strength 28.1 MPa ...
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Shear Strength and Energy Evolution of Granite under Real …
Reliable estimates of the strength and deformation characteristics of rock masses are required …
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Dynamic uniaxial compression tests on a granite
The results indicate that the compressive strength increases from 205 MPa to 235 MPa with loading rate increasing from 10 0 to 10 5 MPa/s. The relationship between the uniaxial compressive strength and loading rate for the granite can be expressed as: (3) σ dc =11.9 log ( σ ̇ dc / σ ̇ sc )+170
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Dynamic rock tensile strengths of Laurentian granite: …
the dynamic direct tensile strength of Laurentian granite (LG) (Huang et al., 2010). In this work, we first overview the three dynamic tensile strength measurement methods: dynamic BD, dynamic SCB ...
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Experimental investigation into biaxial compressive strength of granite
Also, conventional uniaxial compressive strength tests were conducted on cylindrical samples in accordance with ISRM standards [16]. Large granite blocks that are approximately 500 mm 400 mm 350 mm were extracted from a depth of 230 m below surface at the Huahe Granite Mine, located in the Guishan Town of Macheng City, Hubei Province of China.
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Reanalysis of the Stress-Strain Conditions in Maddhapara Granite Mine …
The average lower tangent modules values of first, second and third category are 17.91 MPa, 13.73 MPa and 8.73 MPa respectively. Stress analysis with the excavations as planned by MGMCL at Maddhapara
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