Influence of initial thermal cracking on physical and mechanical behavior of a coarse marble: Insights from uniaxial compression tests with acoustic emission monitoring

Guan, Rong; Yao, Mengdi; Peng, Jun; Sha, Song; Tan, Jie

doi:10.1093/gji/ggy257

Cited by 12 publications

(15 citation statements)

References 64 publications

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“…The granite samples fail by the coexistence of tension and shear. The failure mode changes from brittle to quasi-brittle [95]. More noticeably, another change at around 800 • C is a significant increase in peak strain and shear-slip strain (Figures 13 and 15), indicating that the rock has undergone a certain brittle-plastic transition, which can be verified by the SEM tests [93].…”

Section: Discussionmentioning

confidence: 58%

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Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

et al. 2019

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In deep geoengineering, including geothermal development, deep mining, and nuclear waste geological disposal, high temperature significantly affects the mineral properties of rocks, thereby changing their porous and mechanical characteristics. This paper experimentally studied the changes in mineral composition, pore structure, and mechanical characteristics of pyroxene granite heated to high temperature (from 25 °C to 1200 °C). The results concluded that (1) the high-temperature effect can be roughly identified as three stages: 25–500 °C, 500–800 °C, 800–1200 °C. (2) Below 500 °C, the maximum diffracted intensities of the essential minerals are comparatively stable and the porous and mechanical characteristics of granite samples change slightly, mainly due to mineral dehydration and uncoordinated thermal expansion; additionally, the failure mechanism of granite is brittle. (3) In 500–800 °C, the diffraction angles of the minerals become wider, pyroxene and quartz undergo phase transitions, and the difference in thermal expansion among minerals reaches a peak; the rock porosity increases rapidly by 1.95 times, and the newly created pores caused by high heat treatment are mainly medium ones with radii between 1 μm and 10 μm; the P-wave velocity and the elastic modulus decrease by 62.5% and 34.6%, respectively, and the peak strain increases greatly by 105.7%, indicating the failure mode changes from brittle to quasi-brittle. (4) In 800–1200 °C, illite and quartz react chemically to produce mullite and the crystal state of the minerals deteriorate dramatically; the porous and mechanical parameters of granite samples all change significantly and the P-wave, the uniaxial compressive strength (UCS), and the elastic modulus decrease by 81.30%, 81.20%, and 92.52%, while the rock porosity and the shear-slip strain increase by 4.10 times and 11.37 times, respectively; the failure mechanism of granite samples transforms from quasi-brittle to plastic, which also was confirmed with scanning electron microscopy (SEM).

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Section: Discussionmentioning

confidence: 58%

“…The granite samples fail by the coexistence of tension and shear. The failure mode changes from brittle to quasi-brittle [95]. (5) Above 800 °C, feldspar and quartz particles in granite would partially melt along mineral boundaries [96,97] and metal bonds such as Al-O, K-O, Na-O, and Ca-O in rock minerals break.…”

Section: Discussionmentioning

confidence: 99%

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

et al. 2019

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“…According to equation (22), we get the evolution curve of the bending neutral layer as shown in Figure 9. Figure 9 shows that the bending neutral layer moved slowly towards the compressive zone, a small distance in the range of 0 s-65 s, but moved fast a long distance in the range of 65 s-80 s. In correspondence to the experimental phenomena, there was no macrocrack propagation in the range of 0 s-65 s so that the position of the bending neutral layer was almost same as before.…”

Section: Verification and Discussion On Space-time Evolution Of The Bmentioning

confidence: 99%

“…Yao et al [21] proposed a two-parameter tensile strength model for rocks based on the successful application of the nonlocal theory and the threepoint bending test. Rong et al [22] studied the effects of initial thermal cracking on the physical and mechanical behavior of coarse marble using uniaxial compression test and acoustic emission test. Chen et al [23] conducted a series of acoustic emission compression tests on rock samples to study the damage evolution characteristics of rock during loading.…”

Section: Introductionmentioning

confidence: 99%

Study on Bending Damage Constitutive Model and Mechanical Properties of Limestone Based on Acoustic Emission

Zhang

Zuo

et al. 2019

Advances in Civil Engineering

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To reveal the mechanical characteristics and damage evolution mechanism of limestone in the bending process, the cumulative acoustic emission (AE) hits were used to define the damage variable, and the rock microbody hypothesis and the Weibull distribution function were applied to further improve the damage variable. Meanwhile, the bending damage constitutive model of limestone under three-point bending was developed based on the Lemaitre strain equivalence principle and the continuum damage theory. Then, the three-point bending test with acoustic emission monitoring was carried out to verify the rationality and validity of the model. Results showed that the modified damage variable D had an exponential distribution with the strain ε, and the damage was mainly concentrated in the macrocrack propagation stage. Moreover, the bending neutral layer moved towards the compressive zone in the bending damage process. The bending neutral layer, furthermore, moved slowly a small distance at the initial stage of bending fracture but moved fast a long distance at the end stage of bending fracture. In addition, the bending damage constitutive model could be quantitatively expressed by the cumulative AE hits Np, the stress σ, the strain ε, and Young’s modulus E. The theoretical stress-strain model curves agreed well with experimental results, which demonstrated that the proposed model could capture the damage evolution of limestone reasonably in the bending process.

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“…Similarly, with an increase in the applied temperature, the P-wave velocity showed a decreasing trend [13][14][15]. This was mainly associated with the microcracks generated by the thermal expansion of minerals [16,17]. As two important parameters in rock engineering design, the Young's modulus [18][19][20][21][22] and compressive strength [23][24][25][26][27] were also found to generally decrease as the treatment temperature increased.…”

Section: Introductionmentioning

confidence: 90%

Comparison of Mechanical Behavior and Acoustic Emission Characteristics of Three Thermally-Damaged Rocks

Peng

Yang

2018

Energies

Self Cite

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High temperature treatment has a significant influence on the mechanical behavior and the associated microcracking characteristic of rocks. A good understanding of the thermal damage effects on rock behavior is helpful for design and stability evaluation of engineering structures in the geothermal field. This paper studies the mechanical behavior and the acoustic emission (AE) characteristic of three typical rocks (i.e., sedimentary, metamorphic, and igneous), with an emphasis on how the difference in rock type (i.e., porosity and mineralogical composition) affects the rock behavior in response to thermal damage. Compression tests are carried out on rock specimens which are thermally damaged and AE monitoring is conducted during the compression tests. The mechanical properties including P-wave velocity, compressive strength, and Young’s modulus for the three rocks are found to generally show a decreasing trend as the temperature applied to the rock increases. However, these mechanical properties for quartz sandstone first increase to a certain extent and then decrease as the treatment temperature increases, which is mainly attributed to the high porosity of quartz sandstone. The results obtained from stress–strain curve, failure mode, and AE characteristic also show that the failure of quartz-rich rock (i.e., quartz sandstone and granite) is more brittle when compared with that of calcite-rich rock (i.e., marble). However, the ductility is enhanced to some extent as the treatment temperature increases for all the three examined rocks. Due to high brittleness of quartz sandstone and granite, more AE activities can be detected during loading and the recorded AE activities mostly accumulate when the stress approaches the peak strength, which is quite different from the results of marble.

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Influence of initial thermal cracking on physical and mechanical behavior of a coarse marble: Insights from uniaxial compression tests with acoustic emission monitoring

Cited by 12 publications

References 64 publications

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

Study on Bending Damage Constitutive Model and Mechanical Properties of Limestone Based on Acoustic Emission

Comparison of Mechanical Behavior and Acoustic Emission Characteristics of Three Thermally-Damaged Rocks

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