Results 11 to 20 of about 7,862 (247)

Study on Kaiser effect of granite under cyclic loading and unloading at different temperatures. [PDF]

Sci Rep
During the tunneling process in high-temperature environments, the surrounding rock mass is subjected to periodic pressurization and depressurization, making it prone to instability and failure. To investigate the damage and failure of high-temperature rock under cyclic loading-unloading, uniaxial cyclic loading-unloading tests and ABAQUS numerical ...
Bao X, Huang S, Lv Y, Huang Y, Wang L, Zhang X.   +5 more
europepmc   +4 more sources

Influence of Loading Rate on the Energy Evolution Characteristics of Rocks under Cyclic Loading and Unloading [PDF]

Energies, 2020
To analyse the effect of loading rate on the energy evolution of rocks under cyclic loading and unloading, tests on saturated limestone were conducted at loading rates of 0.15, 0.2, and 0.3 mm/min, and the evolution characteristics of plastic, elastic, dissipation, and input energies were examined under different loading rates.
Cai-Chu Xia, Longyin Zhu, Liu Hong
exaly   +3 more sources

The influence of cyclic loading-unloading rates on the uniaxial mechanical anisotropy of coal. [PDF]

Sci Rep
Abstract In this study, the influence of the loading-unloading rate on the uniaxial mechanical anisotropy of coal was investigated via uniaxial compress testaments, acoustic emission (AE) monitor and digital image correlation (DIC), and a series of coal specimens with five anisotropy angles.
Xu D, Song H, Zhao L, Tang G, Hu S, Duan C, Song Y.   +6 more
europepmc   +3 more sources

Mechanical behavior of sandstone during post-peak cyclic loading and unloading under hydromechanical coupling

International Journal of Mining Science and Technology, 2023
This paper investigates mechanical behaviours of sandstone during post-peak cyclic loading and unloading subjected to hydromechanical coupling effect, confirming the peak and residual strengths reduction laws of sandstone with water pressure, and ...
Yanlin Zhao, Jinhai Liu, Chunshun Zhang, Houquan Zhang, Jian Liao, Sitao Zhu, Lianyang Zhang   +6 more
doaj   +3 more sources

Study of Mechanical Property of Rock under Uniaxial Cyclic Loading and Unloading [PDF]

Advances in Civil Engineering, 2018
Through studying the mechanics, energy, and deformation features of rock under uniaxial cyclic loading and unloading, the findings are as follows: (1) under cyclic loading and unloading, the curve of stress and strain for loading and unloading in every ...
Hongjun Guo, Ming Ji, Yidong Zhang, Meng Zhang   +3 more
doaj   +2 more sources

Study on the failure and acoustic emission characteristics of coal under graded cyclic loading and unloading stress paths [PDF]

Scientific Reports
To study the influence of cyclic disturbance stress on the mechanical behavior of coal during mining, a gas containing coal fluid-solid coupling servo seepage experimental system was used to conduct experimental research on the acoustic emission (AE ...
Minke Duan, Meijuan Lu, Ruiqi Ban, Ke Yang, Xin Lyu, Changbao Jiang, Xuelong Hu, Jinzhou Tang   +7 more
doaj   +2 more sources

Experimental Research into the Evolution of Permeability in a Broken Coal Mass under Cyclic Loading and Unloading Conditions

Applied Sciences, 2019
The permeability characteristics of a broken coal mass under repeated loading and unloading conditions exert significance on spontaneous combustion of coal in goaf during the mining of coal seam groups.
Bo Li, Quanle Zou, Yunpei Liang
doaj   +3 more sources

Energy Behaviour of Coal Failure under Uniaxial Cyclic Loading/Unloading

Applied Sciences (Switzerland), 2023
Coal failure is often the precursor of dynamic disaster. The energy evolution behaviour at different stress values was analysed under the gradation of equal amplitude cyclic loading/unloading. Based on the energy dissipation behaviour, the energy evolution model of the coal specimen was established. The multi-parameter energy behaviour predicting model
Chunlai Wang, Wang Chunlai
exaly   +3 more sources

Precursors of Cyclic Loading and Unloading Sandstone Failure Based on “Acoustic-Thermal” Loading–Unloading Response Ratio

Sustainability, 2023
Coal mining often causes periodic disruption in the rock mass around the stope. The study of the deformation and failure characteristics of cyclic loading and unloading sandstone is very critical for gaining a thorough understanding of the mechanisms of rock damage, degradation, and failure. This kind of investigation is very helpful in determining the
Hao Xu, Liqiang Ma, Kewang Cao, Naseer Muhammad Khan, Sajjad Hussain, Dongdong Niu, Saad S. Alarifi, Sher Bacha   +7 more
openaire   +1 more source

Mechanical properties and energy evolution characteristics of borehole-containing specimens under disturbances of cyclic incremental stress with different lower limits

Journal of Materials Research and Technology, 2023
Drilling gas drainage boreholes in coal mines is a major measure to prevent gas disasters in coal mines. However, coal mining disruptions can affect the stability and shape of gas drainage boreholes.
Xiaoyan Sun, Zihan Chen, Quanle Zou
doaj   +1 more source