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A total of four sets of multistage triaxial compression test were conducted on limestone sample over the range of confining pressure of 1–15 MPa. From the Mohr–Coulomb failure envelope, the range of friction angle ϕ of limestone was 46°–54.2° with mean of 49.6°. The respective cohesion C ranges from 12 to 28 MPa with mean of …
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Deviatoric stress-strain curves from the triaxial compression tests of the limestone samples with a single loading rate (0.003 mm/s). ... China. Correspondence should be addressed to …
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Acoustic emission (AE) tests were performed on saturated karst limestone under uniaxial and triaxial compression. Mechanical properties, AE characteristics, and the energy mechanism of rock failure were analyzed. The peak AE activity under uniaxial compression occurred near the peak stress of the rock. Under triaxial compression, …
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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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The dynamic fragmen-tation fractal dimension of compact-type (BM-type and M-type) reef limestone is mainly in the range of 1.129– 2.072. Loose-type (BS-type and S-type) reef limestone shows a higher dynamic fragmentation degree at the high strain rate and its fractal dimension is mainly in the range of 2.17–2.666.
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The damage characteristics of coral limestone are of great significance for guiding the design and construction of offshore engineering such as submarine tunnels and pipelines. The mechanical properties and damage behavior of coral limestone collected from the Zhongsha Islands, South China Sea were investigated based on the results of …
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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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Classification and Fractal Characteristics of Limestone Fragments Obtained in Conventional Compression and Cyclic Loading Tests under Uniaxial and Triaxial Conditions ... Rui Yang State Key Laboratory Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, …
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The results of the uniaxial compression test showed that the UCSs of CFL, CBL, CGL, and CCL ranged from 44.43 to 54.05 MPa, 27.41 to 43.98 MPa, 5.05 to 28.78 MPa, and 4.75 to 8.63 MPa, respectively (Fig. 4). The uniaxial compression curves of the CFL exhibited a "single-peak" characteristic.
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2.2. Principle of Coupled Static-Dynamic Loads. In this test, modified dynamic testing equipment in the State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine was adopted to conduct the split tensile tests, as shown in Figure 1.SHPB equipment contained a high pressure air chamber and a bullet …
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Basing on triaxial compression unloading test and acoustic emission (AE) of limestone under three different initial confining pressures (5MPa, 10MPa, and 20MPa) and three …
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These above investigations have provided insights into the compression static and dynamic characteristics of limestone with different initial levels of damage. Hence, in this paper a series of compression tests were conducted on block type limestone by employing a large-scale rock multi-function shear device subjected to 2 110 4 s strain …
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The test results show that with the increase of osmotic pressure, the closure strain, yield strain and peak strain of limestone gradually increase, while the closure stress, yield …
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Limestone from Xuzhou, Jiangsu, China, was selected as the test material. This limestone is gray in its natural state and mainly composed of calcite, dolomite, illite, etc. The limestone has a uniform overall texture and has an average density of 2.71–2.73 g/cm 3. The rock specimens were processed into cylinders with a diameter of 50 mm …
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In this paper, the Split Hopkinson Pressure Bar tests were carried out on the specimens of deep coral reef limestone in the South China Sea, and the difference of dynamic response between deep reef limestone and shallow calcified coral skeleton was revealed. ... Dynamic triaxial compression tests on sandstone at high strain rates and …
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Tests on dynamic properties of coral-reef limestone in South China Sea [J]. Rock and Soil Mechanics, 2019, 40(1): 183-190. [10] PENG Shou-jian, WANG Zhe, XU Jiang, OKUBO Seisuke, TANG Yang, . Experimental study on loading rate effect in post-failure region of water-saturated rock under triaxial compression [J]. Rock and Soil …
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Question: Two triaxial compression tests were performed on two prepared samples of the same limestone. At a confining pressure of 2000 psi, the first sample failed at 9000 psi. Then at a confining pressure of 5000 psi, the other sample failed at 21000 psi. Use P.7 to complete the following questions (a) Plot the two test results on a sigma-tau ...
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Under both the uniaxial stress state and the confining pressure of 10 MPa, the number of limestone specimen fragments generated in the cyclic loading test is greater than that generated in the conventional compression test; and the mass fraction of the fragments in the former test is obviously greater than that in the latter test when the ...
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In order to establish the relation between acoustic emission parameter and rock mechanical damage mechanism, as well as to better figure out landscape limestone damage and deformation influenced by uniaxial compression, MTS815 rock mechanical electro-hydraulic servo test system and 8CHSPCI-2 acoustic emission and detection system …
DetailsWhereas the broken limestone enter plastic compression stage as compression stress exceeds 30–40% of compressive strength. ... This research is supported by the National Natural Science Foundation of China ... particle shape, water pressure, temperature, and stress path are usually considered. The lateral …
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To explore the chemical and mechanical effects of acid mine drainage on water and rock, acid mine drainage (AMD) dissolution tests, triaxial compression tests, and acoustic emission tests were performed on limestone rock samples with different bedding dip angles. Combined with scanning electron microscopy and nuclear magnetic …
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Table 1 lists uniaxial compression test results of limestone–coal combined specimens with different inclination angles. ... Nonferrous Met. Soc. China 24(5), 1538–1546 (2014).
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tests was the MTS815 apparatus at Sichuan University. The specifications of the loading equip-ment are shown in Table 1 [38]. The conventional triaxial compression tests of the micritic bioclastic limestone were per-formed as follows: PLOS ONE Unified transient creep constitutive model based on the crack evolution of micritic bioclastic limestone
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Axial and triaxial compression test. To determine the relationships between the mechanical parameters and dissolution damage characteristics, a series of triaxial …
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In this paper, the Split Hopkinson Pressure Bar tests were carried out on the specimens of deep coral reef limestone in the South China Sea, and the difference of dynamic …
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The triaxial compression with permeability test of limestone samples was conducted by using the improved MTS815 Flex Test GT rock mechanics system of Sichuan University, and PCI-2 acoustic emission test system was used to monitor the failure of limestone …
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During the drained triaxial test, the external confining pressure was kept at 20 MPa, and the pore pressure was kept at 10 MPa. After stabilization, the upper face of the sample was switched from ...
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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 …
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The triaxial compression with permeability test of limestone samples was conducted by using the improved MTS815 Flex Test GT rock mechanics system of Sichuan University, and PCI-2 acoustic emission test system was used to monitor the failure of limestone samples during triaxial compression process [2], as shown in Fig. 5. The …
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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 …
DetailsFigure 2 gives the test results of mechanical properties of dierent rocks under uniaxial compression conditions. Figure 2a shows the stress–strain curves of a set of typical specimens. Figure 2b ...
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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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