Physics and Dynamics Characteristics and Energy Analysis of Freeze‐Thaw Limestone

Ping, Qi; Sun, Hongjian; Zhang, Chuanliang; Zhou, Xin

doi:10.1155/2020/8820172

Cited by 4 publications

(3 citation statements)

References 20 publications

(18 reference statements)

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“…Zhang et al [11] studied the mechanical properties and seepage characteristics of red sandstone under different high temperature environments; Wu et al [12] carried out experimental research on the mechanical properties of Xuzhou marble at normal temperature to 800°C and analyzed in detail the changes of the peak stress, peak strain, elastic modulus, and the whole stress-strain curve of the marble. Chen and Zhang [13] conducted experimental research on the physical and mechanical properties of limestone from 5 different areas at room temperature and after heat treatment at different temperatures of 100°C～800°C and discussed the volume density, porosity, longitudinal wave velocity, elastic modulus, and tensile and compressive strength changes of limestone after high temperature; Qi et al [14] studied the influence of high temperatures (25°C, 200°C, 400°C, and 600°C) on dynamic mechanical properties and energy evolution characteristics of limestone samples; Wang et al [15] compared the dynamic mechanical properties of layered salt rock and mudstone interlayers and established a dynamic strength formula with a better fitting result; Yuan et al [16] studied the coupling effect of water temperature and dry-wet cycle on the dynamic mechanical properties of sandstone; Zhang and Yuan [17] performed a study on sandstone after repeated cooling and heating cycles (H-C).…”

Section: Research On the Stress Of The Surrounding Rock In The Highmentioning

confidence: 99%

Comparative Analysis of Thermomechanical Properties and Thermal Damage Constitutive Models of Three Soft Sedimentary Rocks

Zha

Shao

Yao

et al. 2020

Advances in Civil Engineering

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In order to study the difference in thermomechanical properties of soft sedimentary rocks of different coal measures, three types of soft sedimentary rocks, sandstone, sandy mudstone, and mudstone, which are common in deep mines, are tested using the RMT-150B rock mechanics test system and GD-65/150. Uniaxial compression experiments were conducted on three kinds of soft rock-cement mixed specimens at 25°C～55°C multistage temperature in an environmental chamber. The difference of important parameters such as stress-strain curve, peak stress, and elastic modulus was analyzed and compared. The results show that (i) in the test temperature range, the stress-strain curves of the three types of soft rocks at different temperatures are roughly divided into four stages: compaction, elasticity, yield, and failure. The proportion of deformation in the compaction stage to the total deformation decreases gradually with the increase of temperature. (ii) When the temperature is lower than 40°C, the yield stage is shorter, and the peak stress and elastic modulus of the three types of soft rocks decrease significantly with the increase of temperature. (iii) Above 40°C, the decreasing trend of peak stress and elastic modulus curve decreases, and the yield stage becomes more and more obvious. The decreasing rate of elastic modulus of sandstone is 0.041 GPa/°C; the decreasing rate of peak stress is 0.193 MPa/°C, the decreasing rate of sandy mudstone is 0.022 GPa/°C and 0.124 MPa/°C, and the decreasing rate of mudstone is 0.020 GPa/°C and 0.051 MPa/°C. (iv) The rationality of the established thermal damage constitutive model of sedimentary soft rock was verified.

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Section: Research On the Stress Of The Surrounding Rock In The Highmentioning

confidence: 99%

Comparative Analysis of Thermomechanical Properties and Thermal Damage Constitutive Models of Three Soft Sedimentary Rocks

Zha

Shao

Yao

et al. 2020

Advances in Civil Engineering

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“…Many scholars have studied rock mass mechanical properties and damage laws under the influence of freeze-thaw cycles [1][2][3][4][5][6][7][8][9]. Shi et al [10] analyzed the effects of freezethaw cycles and confining pressures on the mechanical properties of red sandstone.…”

Section: Introductionmentioning

confidence: 99%

Study on Acoustic Emission and Damage Mechanical Properties of Freeze-Thaw Sandstone under Uniaxial Compression

Liang

Yang

2022

Geofluids

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The damage strength of freeze-thaw rock provides an important reference for stability evaluations used during rock engineering in cold regions. In this paper, real-time acoustic emission tests of saturated sandstone are performed after various freeze-thaw cycles to study the uniaxial compressive strength and deformation characteristics of the resulting materials. The macro-meso damage evolution law of loaded sandstone is studied under the action of freeze-thaw cycles. The results show the following: (1) The saturated water absorption of sandstone increases, the peak strength and elastic modulus loss rates of sandstone increase linearly, and the frost resistance of the rock decreases with the number of freeze-thaw cycles. The sandstone failure mode gradually shifts from splitting failure to complex splitting shear failure of the failure surface. (2) If fewer than 10 freeze-thaw cycles are applied, the ring count signals at the compaction stage and after the peak strength is reached are extremely weak under a uniaxial compression load. With additional freeze-thaw cycles, damage inside the rock accumulates gradually, and the ring count signal appears during the rock compaction stage, fluctuates up and down, and continues until the peak strength is reached. When the compressive strength reaches its peak, the ring count intensity signal increases suddenly, and the frequency is high. After the strength reaches its peak, the acoustic emission signal shows that the rock sample still has some residual strength. As the number of freeze-thaw cycles increases, the cumulative ring count of sandstone gradually changes from the jumping stage to gradual growth. The acoustic emission characteristic parameters and ring count reflect damage to and expansion of freeze-thaw sandstone. (3) The cumulative extent of rock damage reaches the threshold value under loading and increases linearly until the rock is destroyed. When more freeze-thaw cycles are used, the time required for the rock to reach this threshold value is shorter, and the time required for sandstone damage is reduced gradually. These results provide a reference for the study of freeze-thaw damage and rock stability in cold regions.

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“…Under different moisture contents, Lu et al [23] quantitatively studied the dynamic failure energy dissipation characteristics of sandstone samples by the SHPB setup. Ping et al [24] analyzed the energy dissipation law of limestone specimens after the freeze-thaw cycles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties and Energy Dissipation of Gas Coal under Dynamic and Static Loads

Cheng

Zhao

et al. 2020

Advances in Civil Engineering

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In order to study the mechanical properties and energy dissipation of gas coal under dynamic and static loads, the static loading and impact tests of different strain rates were carried out by the testing systems of SZW-1000 microcomputer servo pressure tester and separated Hopkinson pressure bar (SHPB) for gas coal in the Panxie Coal Field in Huainan City. In the test, the influence laws of various loading patterns on mechanical properties, failure characteristics, and energy dissipation of gas coal sample were analyzed. The results showed that the stress-strain curve of coal gas under dynamic load had no micropore compaction stage compared with that under static load. Dynamic compressive strength, dynamic strength growth factor, mixed dynamic elasticity modulus, and dissipation energy were all highly correlated with strain rate, whereas energy dissipation rate was uncorrelated with strain rate. In addition, the gas coal sample with lower strain had small dissipated energy, and it developed a splitting failure mode. With the increase of strain rate, the dissipation energy increased and the crushing degree of gas coal intensified, finally presenting a compressive failure mode. Based on the comparison of dissipated energy densities of different gas coal samples, given the same dissipated energy density, the failure degree of sample under dynamic load was higher than that under static load.

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Physics and Dynamics Characteristics and Energy Analysis of Freeze‐Thaw Limestone

Cited by 4 publications

References 20 publications

Comparative Analysis of Thermomechanical Properties and Thermal Damage Constitutive Models of Three Soft Sedimentary Rocks

Comparative Analysis of Thermomechanical Properties and Thermal Damage Constitutive Models of Three Soft Sedimentary Rocks

Study on Acoustic Emission and Damage Mechanical Properties of Freeze-Thaw Sandstone under Uniaxial Compression

Experimental Study on Mechanical Properties and Energy Dissipation of Gas Coal under Dynamic and Static Loads

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