Mechanical Behavior of Red Sandstone under Incremental Uniaxial Cyclical Compressive and Tensile Loading

Zhao, Baoyun; Liu, Dongyan; Huang, Tianzhu; Huang, Wei; Liu, Wei

doi:10.1155/2017/4350437

Cited by 28 publications

(3 citation statements)

References 20 publications

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“…As presented in Figs. 6 and 7, samples usually show no definite peak deviator stress, failure occurs abruptly, and this behavior is common in sandstones [35]. But taking a closer look, and with the maturation of the treated samples with the higher pozzolanic reactions, attention is drawn to a semi-concave end on the charts with lesser confinement, especially in Fig.…”

Section: Unconsolidated Undrained Triaxial Testmentioning

confidence: 99%

Undrained Shear and Pore Space Characteristics of Treated Loose Sands with Lime-Activated Zeolite in Saturated Settings

Jamhiri

Pakbaz

2020

Civil and Environmental Engineering Reports

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This research investigates the mechanical behavior of artificially cemented sandy soils formed by lime alkali activation of natural zeolite under saturation settings. In order to verify the bar capability of cemented sands with this new method, an analysis of the undrained shear strength of the soil with pore water pressure ratio measurements was performed from the interpretation of the results of unconfined compression tests. The effect of zeolite-lime blend on treated sands was also visualized by scanning electron microscopy. For the studied soils, it was concluded from the unconfined compression stress values that the soil is fully capable of withstanding compressions due to overburden pressure. Additionally, this study seeks to evaluate the effect of the void ratio on the pore space and undrained shear strength. The results showed that pore water B-ratio increases with the decrease of the void ratio. Moreover, with the increase of zeolite content, confining pressure, and curing age, the peak failure strength increases. The results indicated a promising consistency of treated samples with lime and zeolite under various values of undrained shearing and B-ratios, making this method an ideal treatment for loose sand deposits.

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Section: Unconsolidated Undrained Triaxial Testmentioning

confidence: 99%

Undrained Shear and Pore Space Characteristics of Treated Loose Sands with Lime-Activated Zeolite in Saturated Settings

Jamhiri

Pakbaz

2020

Civil and Environmental Engineering Reports

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“…Shen et al [13,14] discussed the cause of damage characteristics and thermophysical properties difference of sandstone at different temperatures. Zhao et al [15] carried out research on red sandstone specimens to investigate their short-term and creep mechanical behavior under incremental cyclic compressive and tensile loading. Sun et al [16] studied the mechanical response characteristics of sandstone specimens under different stress amplitudes and loading frequencies by a TAW-2000 rock triaxial testing machine.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Properties and Energy Dissipation of Frozen Sandstone under Shock Loading

Wang

Qin

Jia³

et al. 2020

Shock and Vibration

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In order to understand the mechanical properties and energy dissipation law of frozen sandstone under impact loading, the cretaceous water-rich red sandstone was selected as the research object to conduct impact tests at different freezing temperatures (0°C, −10°C, −20°C, and −30°C). The test results suggested the following: (1) the peak stress and peak strain of frozen sandstone are positively correlated with strain rate and freezing temperature, and the strain rate strengthening effect and the low-temperature hardening effect are obvious. (2) The strain rate sensitivity of dynamic stress increase factor (DIF) is negatively correlated with temperature. Water-ice phase change and the difference in the cold shrinkage rate of rock matrix under strong impact loading will degrade the performance of rock together, so DIF is less than 1. (3) In the negative temperature range from −10°C to −30°C, DEIF is always greater than 1. The energy dissipation rate of red sandstone specimens fluctuated between 10% and 25% under the impact loading, and the data are discrete, showing obvious strain rate independence. The failure form changes from tensile failure to shear and particle crushing failure. (4) Combined with the micromechanism analysis, the difference in dynamic mechanical properties of red sandstone at different temperatures is caused by the water-ice phase change and the different cold shrinkage rates of the frozen rock medium. When the temperature drops from 0°C to −2°C, water migrates to the free space of the pore of frozen rock and freezes into ice crystal, resulting in frozen shrinkage. At −30°C, the expansion of ice dominates and the migration of water will stop, leading to frost heave.

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“…e result showed that the value of AE can predict rock failure at higher confining pressures. Zhao et al [26] carried out short-term creep test of red sandstone under uniaxial incremental cyclic compression and tension load and analyzed its deformation characteristics and energy dissipation. e test results show that the stress-strain curves in compression loading stage and tension loading stage have obvious memory effect.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties and Acoustic Emission Characteristics of Water Bearing Sandstone under Stable Cyclic Loading and Unloading

Qin

Zhou

2020

Shock and Vibration

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Due to the adjustment of energy structure, a large number of coal mines are abandoned. Considering the environmental and economic effects, many experts proposed to use the abandoned mine cavern as the reservoir of the pumped storage power station. Furthermore, considering the long-term effects of repeated pumping and drainage and hydrodynamic pressure on the surrounding rock in coal mines, a large amount of sandstone was collected from the Ruineng coal mine in Yan’an city to carry out a series of laboratory tests. Through uniaxial compression testing of rock samples with different water content rates, combined with acoustic emission (AE) analysis, the strength softening and macrodeformation characteristics are obtained, and the influence of water content on acoustic emission characteristics is clarified. The mechanical properties of water bearing rock under cyclic loading and unloading experiments with varying upper limits are obtained using a triaxial test system, and the precursory information of rock failure is captured, providing significant guidance for stability analysis and instability warning for surrounding rock in pumped storage power stations.

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Mechanical Behavior of Red Sandstone under Incremental Uniaxial Cyclical Compressive and Tensile Loading

Cited by 28 publications

References 20 publications

Undrained Shear and Pore Space Characteristics of Treated Loose Sands with Lime-Activated Zeolite in Saturated Settings

Undrained Shear and Pore Space Characteristics of Treated Loose Sands with Lime-Activated Zeolite in Saturated Settings

Study on Mechanical Properties and Energy Dissipation of Frozen Sandstone under Shock Loading

Experimental Study on Mechanical Properties and Acoustic Emission Characteristics of Water Bearing Sandstone under Stable Cyclic Loading and Unloading

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