Deformation and damage properties of rock-like materials subjected to multi-level loading-unloading cycles

Liu, Zhizhen; Cao, Ping; Zhao, Qingxiong; Cao, Rihong; Wang, Fei

doi:10.1016/j.jrmge.2022.11.009

Cited by 10 publications

(3 citation statements)

References 52 publications

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“…In porous rocks, seismic waves penetrate solid rock particles (Liu et al, 2023). Therefore, for a given rock sample, greater curvature corresponds to longer wave propagation paths and lower apparent velocities, whereas in solid rock the propagation paths are approximately straight lines and the apparent velocities depend on the actual curved path of the wave.…”

Section: Pundit Methodsmentioning

confidence: 99%

“…Rock characterization techniques have undergone significant modification and growth over the past few decades thanks to technical advancements and the creation of new testing machines (Liu et al, 2022). Since there are several sources of variability that have an impact on the behavior of the rock, there are still some questions regarding its categorization.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Coal Pick Excavation on Tunnel Stability Constituent Rock Parameters

Nata,

Ren,

Tanjung

et al. 2023

Preprint

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Underground mining is a mining method in which all mining activities or activities are carried out below the surface of the earth. The purpose of this study is to analyze the quality of rock mass in the tunnel, in terms of the physical, mechanical, and dynamic properties of the rock, as well as observe the influence of coal pick hammer vibration on the stability of the tunnel. and determine supporting recommendations in tunnel 9. The Pundit Test for coal sample with R2 = 0.9023 is obtained. The correlation P-wave with index strength got R2 = 0.8977. For correlation between P-wave and Schmidt Hammer Rebound Number got R2 = 0.9699. Tunnel support recommendation for the AICJ-09 Tunnel with “Q” value of 1.8 and 1.6, it belongs to the poor rock class. Microtremor measurement got the highest vibration value occurred at station 11, where 2 high vibration values were found, namely 0.159 m/s2 and 0.261 m/s2. This happens because the vibration of the coal pick increases because it is influenced by coal transportation activities and there are also additional vibrations originating from the compressor machine working around station 11. Vibration causes a decrease in the value of the tunnel safety factor. The analysis's findings showed that the safety factor's value had decreased. However, the safety factor is still considered safe against tunnels. Where the standard tunnel safety factor of 1 is said to be a stable tunnel.

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Section: Pundit Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Coal Pick Excavation on Tunnel Stability Constituent Rock Parameters

Nata,

Ren,

Tanjung

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Rapid loading and unloading rates were the main factors contributing to the larger dissipation and damage energy in the rock. Meng et al [17] and Liu et al [18] investigated the effect of loading and unloading rates on the energy evolution and damage characteristics of rocks under cyclic loading using four rock samples, and they found that the dissipated energy increased nonlinearly with an increase in loading and unloading rates for all of them. Wang et al [19] used the loading and unloading response ratio (LURR) to evaluate the cumulative damage of porous coal under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Damage Mode and Energy Consumption Characteristics of Paper-Sludge-Doped Magnesium Chloride Cement Composites

Wang,

Gong

et al. 2023

Sustainability

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To reduce the pollution caused by paper sludge in the environment and overcome issues of poor water resistance and brittleness in Magnesium Oxychloride Cement (MOC), the MOC was modified by adding different dosages of paper sludge. The mechanical properties and damage modes of composite MOC materials containing paper sludge were studied by uniaxial compression tests. Under cyclic loading conditions, the damage progression of MOC composites was characterised using the tensile-shear conversion factor (Tsc) and by monitoring the energy parameters (elastic strain energy, plastic strain energy and dissipation energy). The results show that the average peak stress drop of MOC composites gradually increases with the increase in paper sludge dosage. Under uniaxial compression conditions, the Tsc of the MOC composites decreases from 0.99 to 0.44, and the damage mode is transitioned from brittle tensile damage to tensile-shear damage, X-shaped conjugate surface shear damage and finally to pure shear damage with an increase in doping. During cyclic loading conditions, the brittleness of MOC composites gradually decreases with an increase in paper sludge doping, which verifies the effect of paper sludge on the mechanical properties of MOC materials and the change in damage modes from the perspective of energy dissipation.

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Mechanical properties and microstructure of nano-modified geopolymer concrete containing hybrid fibers after exposure to elevated temperature

Zhang,

Sun,

et al. 2023

Construction and Building Materials

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Deformation and damage properties of rock-like materials subjected to multi-level loading-unloading cycles

Cited by 10 publications

References 52 publications

Effect of Coal Pick Excavation on Tunnel Stability Constituent Rock Parameters

Effect of Coal Pick Excavation on Tunnel Stability Constituent Rock Parameters

Damage Mode and Energy Consumption Characteristics of Paper-Sludge-Doped Magnesium Chloride Cement Composites

Mechanical properties and microstructure of nano-modified geopolymer concrete containing hybrid fibers after exposure to elevated temperature

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