Analysis of precursor information for coal and gas outbursts induced by roadway tunneling: A simulation test study for the whole process

2022 ◽  
Vol 122 ◽  
pp. 104349
Author(s):  
Hanpeng Wang ◽  
Bing Zhang ◽  
Liang Yuan ◽  
Su Wang ◽  
Guofeng Yu ◽  
...  
Keyword(s):  
Simulation Test ◽  
Whole Process ◽  
Test Study ◽  
Coal And Gas Outbursts ◽  
Precursor Information

scholarly journals Interrelationships between Acoustic Emission and Cutting Force in Rock Cutting

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Sifei Liu ◽  
Peng Shi ◽  
Zhijun Wan ◽  
Shuaifeng Lu ◽  
Jiakun Lv ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Fractal Dimension ◽  
Cutting Force ◽  
Intelligent Control ◽  
Rock Cutting ◽  
Cutting Process ◽  
Structure Stability ◽  
Whole Process ◽  
Ae Energy ◽  
Precursor Information

Cutting force is the key signal to realize intelligent control of shearer and mastering the change process of cutting force is helpful to improve the adaptive cutting of shearer. In this paper, full scale rock cutting tests are used to carry out single pick cutting experiments on three kinds of coal, and the acoustic emission (AE) signals of coal and rock cutting are monitored in the whole process. The relationship between AE and cutting force is also discussed. The results show that the development of AE energy can represent the different stages of the cutting process, and the time fractal dimension of AE energy can reveal the change law of coal structure stability. In addition, the acoustic emission waveform at the peak cutting force of the same kind of coal has the same main frequency, power spectrum density (PSD) variation law, and the area under PSD curve; for different types of coal, the area under PSD curve at peak cutting force increases with the increase of USC. In the cutting process, the AE signal has obvious characteristics and internal evolution law in energy amplitude, fractal dimension, and PSD index. The change characteristics of AE energy can be used as the precursor information of the peak cutting force, and the coal failure at the peak cutting force has the identity. The above conclusions are of great significance for intelligent control of shearer and intelligent mining of coal mine.

Simulation test study of single event transient effect for high speed PWM with pulse laser

2020 ◽  
Vol 49 (8) ◽  
pp. 20190533-20190533
Author(s):  
安恒 Heng An ◽  
李得天 Detian Li ◽  
文轩 Xuan Wen ◽  
张晨光 Chenguang Zhang ◽  
王鷁 Yi Wang ◽  
...  
Keyword(s):  
Pulse Laser ◽  
High Speed ◽  
Single Event ◽  
Single Event Transient ◽  
Simulation Test ◽  
Transient Effect ◽  
Test Study

Analysis on the Precursor Information of Water Inrush in Karst Tunnels: A True Triaxial Model Test Study

2018 ◽  
Vol 52 (2) ◽  
pp. 373-384 ◽  
Author(s):  
Shucai Li ◽  
Chenglu Gao ◽  
Zongqing Zhou ◽  
Liping Li ◽  
Meixia Wang ◽  
...  
Keyword(s):  
Model Test ◽  
Water Inrush ◽  
True Triaxial ◽  
Test Study ◽  
Precursor Information

Test Study and Application of Corundum Slag in Slag-Forming of BOF

2012 ◽  
Vol 602-604 ◽  
pp. 45-48
Author(s):  
Lu Chen ◽  
Jian Hua Zeng ◽  
Yong Chen ◽  
Xin Teng Liang ◽  
Jun Chen
Keyword(s):  
Melting Point ◽  
Converter Slag ◽  
Metallic Material ◽  
Whole Process ◽  
Test Study ◽  
Melting Period ◽  
Slag Melting

The paper introduced the process of slag-forming by using corundum slag in converter. The results showed that Al2O3 in corundum can reduce converter slag melting point, in advance of slag melting. Using this material, slagging process can be ahead of schedule for 30~40 seconds and the whole process of slag melting is good, without splashing, getting drying and lance-sticking. The consumption of metallic material and lime is reduced, and it shortens the melting period.

Simulation test study of single event transient effect for high speed PWM with pulse laser

2020 ◽  
Vol 49 (8) ◽  
pp. 20190533-20190533
Author(s):  
安恒 Heng An ◽  
李得天 Detian Li ◽  
文轩 Xuan Wen ◽  
张晨光 Chenguang Zhang ◽  
王鷁 Yi Wang ◽  
...  
Keyword(s):  
Pulse Laser ◽  
High Speed ◽  
Single Event ◽  
Single Event Transient ◽  
Simulation Test ◽  
Transient Effect ◽  
Test Study

The Test Study on Fracture Mechanism and Reinforcement Pattern of Backfill Roof under High Stress

2011 ◽  
Vol 243-249 ◽  
pp. 5041-5047
Author(s):  
Xiao Jun Wang ◽  
Kui Zhao ◽  
Qiang Lei
Keyword(s):  
Numerical Simulation ◽  
Physical Modeling ◽  
Mechanical Model ◽  
Failure Modes ◽  
High Stress ◽  
Simulation Test ◽  
Simply Supported ◽  
Test Study ◽  
Cemented Backfill ◽  
Modeling Experiment

The roof is cemented backfill in underhand drift cut-and-filling stopping, stability of cemented fills is the key to safety of mining. Through numerical simulation test, simply supported beams subjected to uniform was considered mechanical model of backfill roof. and failure modes of backfill roof was found through physical modeling experiment. The results show that the failure of backfill roof is first happening from the center at the bottom of backfill, the final result is that falling arch. Based on the the result of the experiment, finally, The reasonable reinforcement pattern was proposed to avoid failure of backfill roof.

Development and Application of Quality Control System for Highway Subgrade Construction

2019 ◽  
Vol 2 (5) ◽  
Author(s):  
Tong Wang
Keyword(s):  
Quality Control ◽  
Real Time ◽  
Detection Method ◽  
System Development ◽  
Effective Control ◽  
Construction Process ◽  
Development Mode ◽  
The Road ◽  
Whole Process

The compaction quality of the subgrade is directly related to the service life of the road. Effective control of the subgrade construction process is the key to ensuring the compaction quality of the subgrade. Therefore, real-time, comprehensive, rapid and accurate prediction of construction compaction quality through informatization detection method is an important guarantee for speeding up construction progress and ensuring subgrade compaction quality. Based on the function of the system, this paper puts forward the principle of system development and the development mode used in system development, and displays the development system in real-time to achieve the whole process control of subgrade construction quality.

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