The influence of cyclic loading-unloading rates on the uniaxial mechanical anisotropy of coal [PDF]
Scientific ReportsIn this study, the influence of the loading-unloading rate on the uniaxial mechanical anisotropy of coal was investigated via uniaxial compressive tests, acoustic emission (AE) monitoring, digital image correlation (DIC), and a series of coal specimens ...
Duo Xu +6 more
doaj +4 more sources
An Investigation on the Impact of Unloading Rate on Coal Mechanical Properties and Energy Evolution Law. [PDF]
Int J Environ Res Public Health, 2022 In order to further explore the relationship between the excavation speed and the damage of surrounding rocks and dynamic manifestation, the stress paths of unloading confining pressure and loading axial pressure were designed based on the changes in the roadway surrounding rock stress in this study.
Guo H, Sun Z, Ji M, Wu Y, Nian L.
europepmc +3 more sources
Buildings, 2023 Consolidated undrained triaxial shear tests were performed on undisturbed saturated structured clay at three unloading rates (0.1, 0.25, and 2.5 kPa/min) using a GDS triaxial system to determine the effects of different unloading rates and unloading ...
Lu Li +3 more
doaj +2 more sources
Unloading responses of pre-flawed rock specimens under different unloading rates
Transactions of Nonferrous Metals Society of China, 2019 Abstract Based on the stress redistribution analysis of rock mass during the deep underground excavation, the unloading process of pre-flawed rock material was simulated by distinct element method (DEM). The effects of unloading rate and flaw inclination angle on unloading strengths and cracking properties of pre-flawed rock specimens are numerically
Xibing Li, Lei Weng
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Experiment on deformation and failure characteristics of sandstone at different unloading rates
Alexandria Engineering Journal, 2023 The unloading effect is an important factor for the failure of surrounding rock in deep underground engineering projects, especially under high-stress conditions.
Yang Peng +5 more
doaj +2 more sources
Deformation and acoustic emission characteristics of hard rock under different unloading rates
AEJ - Alexandria Engineering Journal, 2023 In this paper, triaxial loading and unloading tests under different conditions were carried out to explore the deformation and failure characteristics of hard rock marble, and the acoustic emission information of the test process was monitored ...
Yu Cong
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Excavation unloading‐induced fracturing of hard rock containing different shapes of central holes affected by unloading rates and in situ stresses [PDF]
Energy Science & Engineering, 2020 Slabbing failure and strain rock burst are the main failure patterns during the excavation and construction phases of deep tunnels in hard and brittle rock, which cause unexpected equipment damage and casualties.
Fan Feng +5 more
doaj +2 more sources
Effects of Unloading Rate on Energy Evolution Mechanism in the Single-Side Unloading Failure of Highly Stressed Marble [PDF]
Advances in Civil Engineering, 2020 Highly stressed rock masses continuously exchange substances and energy with the outer environment during single-side unloading, which is a damage evolution process with energy dissipation.
Wensong Xu +5 more
doaj +2 more sources
Experimental study on the effect of unloading rate on gneiss rockburst
Journal of Rock Mechanics and Geotechnical EngineeringRockburst are often encountered in tunnel construction due to the complex geological conditions. To study the influence of unloading rate on rockburst, gneiss rockburst experiments were conducted under three groups of unloading rates.
Dongqiao Liu +6 more
doaj +2 more sources
Effect of true triaxial principal stress unloading rate on strain energy density of sandstone [PDF]
Scientific ReportsDeep rock are often in a true triaxial stress state. Studying the impacts of varying unloading speeds on their strain energy (SE) density is highly significant for predicting rock stability.
Zhixi Liu +3 more
doaj +2 more sources