Results 31 to 40 of about 1,490 (177)

Numerical Simulation of the Impact of Unmined Longwall Panel on the Working Stability of a Longwall Using UDEC 2D—A Case Study

Energies, 2022
The main goal of the paper is numerical simulation for investigation of damage causes in the working of a longwall located under the unmined longwall panel. The paper presents the results of model-based research on the stability of the roof of a longwall
Sylwester Rajwa, Tomasz Janoszek, Janina Świątek, Andrzej Walentek, Dominik Bałaga   +4 more
doaj   +1 more source

Review of an Improved Longwall Panel Layout for Ground Control in Longwall Mining

Shock and Vibration, 2022
Conventional longwall layout (CLL) for mining coal, trona, etc. is still fraught with problems including low resource recovery, wavy ground surface subsidence, bumps or rockbursts, gateroad support and maintenance, poisonous air hazard, spontaneous combustion in coal mines, instability of equipment at inclined, or steeply inclined working face, etc. In
Zhoufeng Cui, P. F. Wang, Zuotao Li, Yang Yu   +3 more
openaire   +3 more sources

Research progress on key technologies of long-distance, heavy-duty scraper conveyors

矿业科学学报
As fully-mechanized coal mining faces advance toward long-distance and high-throughput operations, long-distance, heavy-duty scraper conveyors are increasingly challenged by amplified self-weight, accumulated running resistance and insufficient ...
HUANG Lei, WU Yaming, ZHANG Qingzhong, JIA Anhao, YANG Jie, ZHANG Qiang   +5 more
doaj   +1 more source

Analysis and Assessment of Parameters Shaping Methane Hazard in Longwall Areas

Journal of Sustainable Mining, 2013
Increasing coal production concentration and mining in coal seams of high methane content contribute to its growing emission to longwall areas. In this paper, analysis of survey data concerning the assessment of parameters that influence the level of ...
Eugeniusz Krause, Adam Smoliński
doaj   +1 more source

Longwall mining [PDF]

, 1995
As part of EIA`s program to provide information on coal, this report, Longwall-Mining, describes longwall mining and compares it with other underground mining methods. Using data from EIA and private sector surveys, the report describes major changes in the geologic, technological, and operating characteristics of longwall mining over the past decade ...
openaire   +2 more sources

Technology path and assumptions of intelligent surrounding rock control at longwall working face

矿业科学学报, 2022
The intelligent surrounding rock control at longwall working face is the necessary condition to realize the intelligent mining of working face. This paper redefined the connotation of the surrounding rock system at longwall working face and clarified the
Yang Shengli, Wang Jiachen, Li Ming
doaj   +1 more source

Simulation-based multiobjective optimization of tail beam control strategy for top-coal caving

Advances in Mechanical Engineering
In longwall top-coal caving, the motion control strategy of the hydraulic support tail beam directly affects the caving performance. To reduce gangue admixture and improve the efficiency of top-coal discharge, this study proposes an offline parameter ...
Lei Huang, Pinghui Li, Yaming Wu, Qingzhong Zhang, Anhao Jia, Jie Yang   +5 more
doaj   +1 more source

Fracture evolution of a thick soft protection layer and the water inrush mechanism in overburden under longwall mining

Deep Underground Science and Engineering, EarlyView.
Through shear–tensile creep tests and viscoelastic modeling, the fracture evolution of thick soft protective layers is clarified. Results show thickness‐dependent rheological failure modes that govern four types of roof water inrush, providing a mechanism‐based framework for hazard prediction and control. Abstract In the Jurassic coal‐bearing strata of
Mengnan Liu, Wei Qiao, Xianggang Cheng, Xiangsheng Meng, Peichao Feng   +4 more
wiley   +1 more source

Exponentially‐constrained Gaussian mixture model for quantifying vertical development of water‐conducting fracture zones in lithologically stratified mining roofs

Deep Underground Science and Engineering, EarlyView.
This study proposes an exponentially‐constrained Gaussian mixture model (EcGMM) to quantify vertical fracture heterogeneity in stratified roof strata. The model integrates a piecewise exponential decay term capturing global stress dissipation with Gaussian components representing localized fracture intensification at lithological interfaces.
Huiqing Yuan, Zhimin Xu, Weixiao Chen, Chenghang Zhang, Shijie Xiong, Yajun Sun   +5 more
wiley   +1 more source

Overlying strata movement and stress evolution laws triggered by fault structures in backfilling longwall face with deep depth

Geomatics, Natural Hazards & Risk, 2020
Many dynamic disasters such as coal wall caving and roof falling have happened during longwall face crossing fault. Combined with the coal seam geological conditions in the 1302 longwall face AB coal mine, the paper comprehensively studies the overlying ...
Fangtian Wang, Qi Ma, Cun Zhang, Guangming Feng   +3 more
doaj   +1 more source