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In situ uniaxial compressive strength of rocks can be determined by the SVM and the BPNN using log data (Miah et al. 2020). Various machine learning models ... For the Barre granite, the rock density is 2660 kg/m 3, the specimen diameter is 40 mm, the Young's modulus is 32.7 GPa, and the static tensile strength is 13 MPa. We input …
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PDF | On Apr 24, 2019, S. Ranjbar and others published Determination of Uniaxial Compressive Strength of Granite Rock Samples using Electrical Resistivity Measurement: NDT | Find, read and cite ...
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Vol. 40 (No. 1), June 2021 19 Prediction of Uniaxial Compressive Strength of Granite Rock Samples of Lugoba Quarry Using Rebound Hammer Test lengths/diameter ratios were between the recommended ratios of 2 to 3. A cylindrical core sample was loaded axially with no support until failure occurred. The maximum value of the axial stress was ...
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Granite is a common construction material that is widely used in the various types of structures, but its dynamic behavior is not clearly understood. To investigate the uniaxial compressive behavior of the granite under high strain rates compression, three groups of specimens with the same aspect ratio (0.5) but different diameters were tested …
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By using the laser irradiation cracking method, this study investigates the changes in uniaxial compressive strength, ultrasonic characteristics and crack distributions of granite specimens by ...
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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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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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The uniaxial compressive strength (UCS) is one of the most important design parameters in a rock engineering projects and it should be determined as a prerequisite for …
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To study the influence of control mode and loading rate on mechanical property of rock, uniaxial compression tests of four types of rocks (gray sandstone, red sandstone, mudstone and granite) are ...
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Granite gneiss is a type of metamorphic rock generally characterized by a compact structure, low porosity and relatively high mechanical strength (Wang et al. 2014a; Liu et al. 2016a).It is a preferred host rock for underground storage of oil, CO 2, and shale gas, and for radioactive waste disposal (Tsang et al. 2005; Liu and Xu 2015).Good …
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The modelled strength of the intact granite is 360 MPa at a depth of 1400 m and increases to 455 MPa at 2200 m (using our estimate for the empirical m i term of 30, determined using triaxial and tensile strength measurements on the intact granite). Strength of the rock mass varies in accordance with the fracture density and the extent …
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The dynamic properties of a granite rock used in crushed form as coarse aggregate in high-strength concretes, were examined. Cylindrical specimens were core …
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The material studied in the present study is fresh granite cores. For this reason, these index tests were not applied on the specimens, and hence, the previous works related to the ... generalized regression neural network approach and adaptive neuro-fuzzy inference systems for prediction of unconfined compressive strength of rocks …
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The uniaxial compressive strength (UCS) of rocks is an essential input parameter for engineering design in mining and civil engineering. This research aimed to investigate the relationship between nano-mechanical properties and macroscopic mechanical properties that result from microstructural constituents of rock materials. …
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Piezoelectric excitation of quartz mineral phase in granite using high-frequency and high-voltage alternating current (HF-HV-AC) is a potential new weakening pretreatment in comminution of rock. The present study addresses this topic numerically by quantifying the weakening effect on the compressive strength of granite. For this end, …
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This article explores the use of different metaheuristic optimization algorithms for training a self-organizing neural network (SONN) model to estimate Brazilian tensile strength (BTS) in granite rocks, including brainstorm optimization (BSO), coronavirus herd immunity optimization (CHIO), and social ski-driver optimization …
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Uniaxial compressive strength ( c) and deformation modulus of rocks Average values from tests of intact rock samples Tests of rocks world-wide Scandinavian rocks tested at ... Granite 154 48 313 71 169 42 250 20 Granodiorite 160 51 319 2 171 20 118 2 Gabbro 228 106 466 5 248 76 306 1 ...
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Rocks are rated on the on the Moh's Hardness Scale which rates the rocks on the scale from 1 to 10. Rocks with hardness 1-3 are soft rocks from 3-6 are medium hardness rocks and 6-10 are hard rocks. The hardness of Granite is 6-7 whereas its compressive strength is 175.00 N/mm 2. Streak is the color of rock when it is crushed or powdered. …
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The point load test (PLT) has been considered a flexible approach to estimate the uniaxial compressive strength (UCS) of rocks. Previously, empirical equations were obtained by mathematical fitting or machine learning to predict the UCS of rocks. ... (MPa) and point load strength index (Is(50)) (MPa) for granite. Reference Years Rock type ...
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The dynamic properties of a granite rock employed in crushed form as coarse aggregate in high-strength concrete, were experimentally characterised, and the average values obtained were assumed to ...
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Table 1: Rock Strength Parameters (from Attewell & Farmer, 1976) Strongest Rocks in Compression. Strength in compression is basically how hard you can squeeze something before it fails, or breaks. So when we talk about the compressive strength of rocks, we're looking at how hard we can squeeze or press down on them before the break.
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Using experimental studies that combine traditional laboratory compressive strength tests with advanced petrographic image analysis and acoustic emission (AE), researchers were able to investigate the effect, and determine the impact of mineralogical compositions and morphologies on the mechanical strength of the rocks (Eberhardt et …
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Relationships between drilling parameters and the uniaxial compressive strength (UCS) of rocks are typically established through measurement while drilling …
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Prediction of Uniaxial Compressive Strength of Granite Rock Samples of Lugoba Quarry Using Rebound Hammer Test 18 Tanzania Journal of Engineering and Technology (Tanz. J. Engrg. Technol.), Vol. 40 (No. 1), June 2021 RHN established using data obtained from field tests is normally used. Compressive strength of a rock material may be defined
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All of the specimens were cored from a large block, and then they were prepared considering the ISRM-suggested methods and ASTM standards. The specimens of the uniaxial compressive strength (UCS), triaxial compressive strength (TCS), and Brazilian tensile strength (BTS) tests are 54 mm in diameter, and they were cut with …
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In order to further explore the change rules of temperature on the elasticity–plasticity of granite rocks, the compressive strength at each temperature point changed with confining pressure as depicted by columns and curves (Fig. 10). As the confining pressure increased linearly, the compressive strength showed a linear …
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related to the uniaxial compressive strength of the rock. As the strength of the rock increases, the penetration ability of the cutting teeth decreases, and the drilling eciency of the drilling rig decreases (Han et al. 2020). In addition, the uniaxial compression process of the rock is consistent
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In this study, 31 empirical equations are summarized that relate unconfined compressive strength and internal friction angle of sedimentary rocks (sandstone, shale, and …
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Block punch index, point load strength, Schmidt rebound hardness, ultrasonic P-wave velocity, effective porosity, density and uniaxial compressive strength of three rock types (i.e. granite, schist and sandstone) were determined. Regression analyses and fuzzy inference system were used to estimate UCS from the said indices.
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