Strength Characteristics of Reef Limestone for Different Cementation
Wang et al. (2020) conducted uniaxial compression tests on reef limestone specimens with three different cementation types collected from the Nansha Islands and discussed their strength ...
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Study of the internal re-breaking characteristics of broken limestone
Whereas 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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Study on the mechanical and damage properties of laminated limestone …
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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Experimental study on the effects of interface dip angle on
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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Model test on rock-socketed pile in reef limestone
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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Uniaxial compression mechanical properties and damage …
The rationality of the model was verified using the results of the uniaxial compression test of limestone under different osmotic pressures. The results show that the test results under different osmotic pressures are in good agreement with the theoretical curves, and the model in this paper can reflect the stress-strain response of limestone ...
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Triaxial drained compression test on ''Indiana …
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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Dynamic compressive properties and self-similarity
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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Solved Two triaxial compression tests were performed on two
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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(PDF) Strain Rate Effect on Acoustic Emission
e uniaxial compression test of the karst limestone was. conducted under different static strain rates (5 ... rock impulsion dynamics," West-China Exploration Engi-neering, ...
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Failure properties of rocks in true triaxial unloading compressive test
Trans. Nonferrous Met. Soc. China 25(2015) 571âˆ'581 Failure properties of rocks in true triaxial unloading compressive test Kun DU 1, Xi-bing LI 2, Di-yuan LI 2, Lei WENG 2 1. ... the standard uniaxial compression test was carried out on two rocks and the uniaxial compressive strengths of granite and red sandstone are 139.0 MPa and 57. ...
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Experimental Investigation of the Static and Dynamic …
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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Investigation on the mechanical behavior, permeability and …
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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Acoustic emission characteristics and damage evolution …
Figure 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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Results of the triaxial compression test
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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Experimental characterization of dynamic strength and
The dynamic compression test of reef limestone concrete under biaxial stress constraint was conducted using a true triaxial Hopkinson bar loading system. This study focused on investigating the effects of strain and lateral stress constraints on the dynamic failure behavior of reef limestone concrete. ... (No. 2020CFA102), and the …
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Crack Initiation and Damage Evolution of Micritized
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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ClassificationandFractalCharacteristicsofLimestoneFragments
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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Uniaxial compression mechanical properties and damage …
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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Tests on dynamic properties of coral-reef limestone in South China …
In this study, Hopkinson pressure bar tests on coral-reef limestone are conducted to investigate the dynamic fracture morphology and dynamic properties of coral-reef limestones of the South China ...
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Dynamic triaxial compression tests on sandstone at high …
Donath et al. 9 conducted triaxial compression tests on lithographic limestone, marble, siltstone and very fine-grained sandstone at different strain rates (ranging from 10 −7 to 10 −3 s −1); the results showed that the strength of limestone increases significantly with the strain rate, which did not have a considerable effect on …
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Investigation of damage characteristics of coral reef limestone …
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). ... In this paper, the Split Hopkinson Pressure Bar tests were carried out on the specimens of deep coral reef limestone in …
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Experimental Study on Damage Behavior of Porous Coral …
axial compression tests on reef limestone collected from Dubai, and classied it as weak or extremely weak rock, with a peak strength ranging from 0.13 to 15.75 MPa. It was found that the tangent elasticity modulus of the intact reef limestone specimen was 125.7 times the uniaxial compres-sive strength under 50% unconned compressive …
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4. Fractal Characteristics of Limestone Fragments
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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Experimental Study on Damage Behavior of Porous Coral Limestone …
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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Study on the mechanical and damage properties of …
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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Study on Dynamic Mechanical Properties of Limestone …
The results show that the dynamic compressive strength of limestone has an exponent relation to strain rate. The failure strain, degree of fragmentation, incident energy, and …
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Investigation on the mechanical behavior, permeability …
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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Ringlike failure experiment of thick-walled limestone …
The suggestion may be made that this type of failure is similar to the results of uniaxial compression tests after the complete release of internal and external pressures. In order to draw a comparison, the failure patterns of two specimens under a continuously increasing load, of similar limestone material, are shown in Fig. 4. The …
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Fatigue Characteristics of Limestone under …
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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