Results 31 to 40 of about 943 (203)

Disturbance response instability theory of rock bursts in coal mines and its application

Geohazard Mechanics, 2023
Aiming at the rock burst prevention in coal mines, this study argue that a rock burst is the instability of the coal mass deformation system with the infinite deformation response subjected to a small disturbance, and the concepts of control, disturbance
Yishan Pan, Aiwen Wang
doaj   +1 more source

Effects of a simulated freezing construction environment on the mass concrete performance

工程科学学报, 2022
Exhausted shallow resources have turned mining into deep mining, with the mining depth of most mines under construction being more than 1000 m. With the continuous increase of the mining depth of mineral resources, the thickness and strength grade of the
Rui-dong WU, Juan-hong LIU, Hong-guang JI, Shu-wu CHE, Yu-cheng ZHOU, Guang-tian ZHANG   +5 more
doaj   +1 more source

Dynamic failure characteristics and acoustic emission response mechanism of coal mass with various coal burst liabilities. [PDF]

PLoS One
Coal burst liability is a key influencing factor for the occurrence of impact rock burst disaster. Uniaxial compression tests were conducted on coal bodies with various coal burst liabilities to analyze the dynamic failure characteristics of typical coal bodies, dimension (fractal dimension is a measure to describe the irregular shape of complex body),
Zhu Z, Wang P, Lv F.
europepmc   +3 more sources

Loading Rate and Bedding Plane Coupled Effect Study on Coal Failure under Uniaxial Compression: Acoustic Emissions and Energy Dissipation Analysis

Geofluids, 2022
The mechanical behavior of coal is significantly influenced by the loading rate and bedding plane. In this paper, the uniaxial compression tests at different loading rates were conducted on coal specimens with vertical bedding (CSVB) and coal specimens ...
Jinlong Zhou, Yixin Zhao, Gustavo Paneiro, Wengang Liu, Xiaoliang Wang, Hao Wang, Yirui Gao, Chujian Han, Xiufeng Zhang   +8 more
doaj   +1 more source

Study of effect and mechanism of flame retardation-bursting liability reduction based on chelating water injection wetting agent in coal seam

Energy Reports, 2022
As coal mines continue to deepen high-intensity mining, the two disasters of coal seam rock burst and spontaneous combustion obviously have a trend of compound occurrence.
Lianman Xu, Hao Wei, Xinyue Kang, Yajing Li, Fengshuo Yang, Wenxin Li, Jianxin Kou, Xinyang Bao, Hui Fu   +8 more
doaj   +1 more source

Analysis and Research on the Comprehensive New Index of Bursting Liabilitys in Yima Coalfield

IOP Conference Series: Earth and Environmental Science, 2021
Abstract Aiming at the phenomenon that the impact energy index, the elastic energy index and the dynamic failure time are contradictory in the process of the impact tendency identification experiment, it is impossible to accurately distinguish the strength of impact tendency.
openaire   +1 more source

Study on the dynamic evolution characteristics of deformation and collapse of the extra-thick hard roof

矿业科学学报, 2021
Yima coal field has an extra-thick hard rock strata, which is the main cause of many dynamic disasters in the mining area. Based on the mining face 21221 of Qianqiu mine in Yima coal field, Henan Province, China, this paper studies the movement ...
Wang Hongwei, Deng Daixin, Jiang Yaodong, Shi Ruiming, Yang Guozhen, Zhang Xiaohai   +5 more
doaj   +1 more source

Early-warning evaluation and warning of rock burst using acoustic emission characteristics of coal sample failure

Meitan kexue jishu, 2023
As the most common dynamic disaster of coal rock in deep coal mining, rock burst seriously affects the safe and efficient mining of coal resources. Accurate and timely to predict the rock burst is the best way to control and prevent it. In order to study
CHEN Jie, LIU Bo, ZHU Chao, PU Yuanyuan, GAO Jingkuan, CUI Yi, ZHANG Chuanjiu   +6 more
doaj   +1 more source

A lifespan staging model of basal forebrain cholinergic vulnerability. [PDF]

Alzheimers Dement
Abstract The cholinergic neurons of the basal forebrain are among the most vulnerable cell types to age‐ and Alzheimer's disease‐related dysfunction and neurodegeneration. However, the biological bases of basal forebrain cholinergic vulnerability (the why) and the temporal sequence (the how) have yet to be fully resolved.
Shanks HRC, Chen S, Onuska KM, Schmitz TW.   +3 more
europepmc   +2 more sources

Mechanism of rock burst in deep coal tunnel surroundings due to three-way stress difference gradient

Meitan xuebao, 2023
With the deep coal tunnel surrounding rock as the research object, in view of the serious rock burst hazards, incomplete rock burst mechanism research, and the lack of more targeted guidance on the prevention and control of rock burst engineering, indoor
Guolei LIU, Zedong WANG, Yu CUI, Qiufeng MA, Lei YAN, Yuzhong HAN   +5 more
doaj   +1 more source