网页2022年9月21日Deep underground rock tunnels and caverns in mountainous areas are often subjected to the coupling impacts of high geo-stresses and high-ground

Contact网页The results show that after 300 °C, 400 °C and 500 °C heating treatment, the diameter of samples increases by 0.066%, 0.143% and 0.409%, respectively, which is a little larger

Contact网页2015年6月4日The high-porosity (33%) sandstone ( Fig. 4a) has a low "crush" strength of about 55 MPa. With a lower porosity of 19%, Berea sandstone has a much higher

Contact网页Uniaxial compressive strength ( c) and deformation modulus of rocks Average values from tests of intact rock samples Granite 154 48 313 71 169 42 250 20 32.7 Granodiorite

Contact网页Unconfirmed Compressive Strength (UCS) stands for the maximum axial compressive stress that a specimen can bear under zero confining stress. Due to the fact that stress is applied along the longitudinal axis, the

Contact网页2023年4月13日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

Contact网页TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression Recall the typical stress strain response curve for a specimen of intact rock under uniaxial

Contact网页2021年2月5日The average compressive strength and standard deviation were found to be 15,707 psi and 398 psi, respectively. Analysis of the data proves that the compressive strength of marble is not influenced by

Contact网页The compressive strength of 207.5, 204.6 and 203.4 MPa; and tensile strength of 13.86, 13.68 and 13.60 MPa were obtained for A, B and C respectively. Rockwell hardness

Contact网页2021年6月20日In this study, to understand the dynamic behavior of the widely used building granite quarried in China, granite cylinders were made for static and dynamic tests. Lu Y, Li Q, Ma G (2010) Numerical investigation of the dynamic compressive strength of rocks based on split Hopkinson pressure bar tests. Int J Rock Mech Min Sci

Contact网页2021年10月1日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

Contact网页2022年10月21日Efficient fracturing is the key issue for the exploitation of geothermal energy in a Hot Dry Rock reservoir. 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 applying a laser beam under various

Contact网页2022年10月1日These test methods investigate the rate dependence of compressive strength of rocks at low and high strain rates, respectively. A general understanding is that the compressive strength slightly increases with a higher strain rate at a low strain rate (e.g. < 5 s −1) and grows rapidly at a high strain rate (e.g. > 500 s −1).

Contact网页2015年6月4日The high-porosity (33%) sandstone ( Fig. 4a) has a low "crush" strength of about 55 MPa. With a lower porosity of 19%, Berea sandstone has a much higher strength of 440 MPa ( Fig. 4b ). Notice that in both Figs. 4a and 4b, permanent deformation remains even after the stress is released.

Contact网页2021年6月7日The compressive strength of the 25 mm specimen is 140.02 MPa, and, with increasing length, the granite compressive strength decreases significantly. The compressive strength of the 50

Contact网页Uniaxial compressive strength ( c) and deformation modulus of rocks Average values from tests of intact rock samples Granite 154 48 313 71 169 42 250 20 32.7 Granodiorite 160 51 319 2 171 20 118 2 30? Gabbro 228 106 466 5 248 76 306 1 25.8 Norite 229 82 356 8 -

Contact网页2019年5月1日The results show that the compression strength and elastic modulus of the granite sample are the largest at the temperature of 20 °C and the lowest at 100 °C. The fracturing degree of the...

Contact网页2021年2月5日The average compressive strength and standard deviation were found to be 15,707 psi and 398 psi, respectively. Analysis of the data proves that the compressive strength of marble is not influenced by

Contact网页2021年1月15日Taking the rock sample with similar loading rate of 0.3 × 10 6 MPa/s as an example, the relationship between static and dynamic combined loading strength and static load strength and impact strength of rock sample is explained. When the axial static pressure is small, such as 3.53 MPa, the impact strength is about 50% higher than the

Contact网页2021年1月26日The compressive strength of granite decreases with an increase in the number of thermal shocks. After 1, 4, 8, 12 and 15 cycles of thermal shocks, the average compressive strengths of the granite samples are 80.35, 70.6, 65.07, 47.39 and 47.39 MPa, respectively, a reduction of 46.89% from 42.67 MPa.

Contact网页2023年4月15日Generally, increases in microwave power and irradiation duration may rise the surface temperature of rocks, generate more fractures, and constantly decrease ultrasonic velocity and strength indicators including uniaxial compressive strength (UCS), tensile strength, point-load strength, and fracture toughness [4, 21].

Contact网页2022年1月12日For Fangshan granite in Beijing, the static compression and dynamic compression tests have been carried out separately under natural air drying and water saturation. It was found that the dynamic compressive strength of water-saturated granite is higher than that of air-dried granite, which is contrary to the result that the strength of

Contact网页2020年12月16日Suorineni 19 challenged the use of the empirical pillar strength formulae to investigate the applicability of the conventional uniaxial compressive strength (UCS) given that this parameter only

Contact网页2021年6月20日To obtain the uniaxial compressive strength of the granite, an MTS-793 fatigue machine (Fig. 2 a) was employed with a displacement-control mode at a loading rate of 0.3125 μm/s. With this machine, the static fracture behavior could be fully demonstrated (Fairhurst and Hudson 1999; Zang and Wanger 2000 ).

Contact网页2021年10月1日The granite coarse aggregate employed in C60, C80 and C110 high-strength concretes has a Young's modulus of 66.8 GPa, and a static uniaxial compressive strength of 210.8 MPa [29], which are much stiffer and stronger than the mortars investigated (i.e. M60, M80 and M110).

Contact网页2022年10月21日Both ends of the granite specimens were ground flat to increase the accuracy of mechanical-property measurements. The uniaxial compressive strength of granite ranged between 120 and 140 MPa, with the main minerals of quartz and albite. The detailed technical data were presented in our previous stone [ 33 ]. 2.2. Experimental

Contact网页2021年1月26日The compressive strength of granite decreases with an increase in the number of thermal shocks. After 1, 4, 8, 12 and 15 cycles of thermal shocks, the average compressive strengths of the granite samples are 80.35, 70.6, 65.07, 47.39 and 47.39 MPa, respectively, a reduction of 46.89% from 42.67 MPa.

Contact网页2022年10月1日The geometrical, physical, and mechanical properties of these rocks are listed in Table A1, including specimen length and diameter, grain size, bulk density, P-wave velocity, as well as compressive strength with the corresponding strain rate.

Contact网页2021年1月15日Taking the rock sample with similar loading rate of 0.3 × 10 6 MPa/s as an example, the relationship between static and dynamic combined loading strength and static load strength and impact strength of rock sample is explained. When the axial static pressure is small, such as 3.53 MPa, the impact strength is about 50% higher than the

Contact网页Uniaxial compressive strength ( c) and deformation modulus of rocks Average values from tests of intact rock samples Granite 154 48 313 71 169 42 250 20 32.7 Granodiorite 160 51 319 2 171 20 118 2 30? Gabbro 228 106 466 5 248 76 306 1 25.8 Norite 229 82 356 8 -

Contact网页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

Contact网页2023年4月13日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

Contact网页2021年2月5日The average compressive strength and standard deviation were found to be 15,707 psi and 398 psi, respectively. Analysis of the data proves that the compressive strength of marble is not influenced by

Contact网页2015年8月1日The parameter K0 is always larger than that in the Coulomb criterion. Tension cut-off is at σE = Q0 − K0T, and tensile strength under compressive stress in the range of σE ≤ σ1 ≤ Q0 is (13) σ T = ( Q 0 − σ 1) / K 0. Strength criteria mentioned above do not consider the effect of the intermediate principal stress.

Contact网页2022年1月12日For Fangshan granite in Beijing, the static compression and dynamic compression tests have been carried out separately under natural air drying and water saturation. It was found that the dynamic compressive strength of water-saturated granite is higher than that of air-dried granite, which is contrary to the result that the strength of

Contact网页2020年12月16日Suorineni 19 challenged the use of the empirical pillar strength formulae to investigate the applicability of the conventional uniaxial compressive strength (UCS) given that this parameter only

Contact网页2023年4月15日The research is aimed at exploring the influences of microwave irradiation on the physicomechanical properties and Cerchar abrasivity index (CAI) of rocks. For this purpose, basalt collected in Chifeng (the Inner Mongolia Autonomous Region, China) was taken as research objects to carry out microwave irradiation tests for different durations

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