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Forecast correct model of overpressure attenuation during gas explosion in excavation roadway

Journal of Coal Science & Engineering(China) 2010年第3期16卷 267-271页

作者： YANG Ying-di ZHANG Guo-shu CHEN Cai-yun Safety ＆ High Efficient Coal Mining Key Lab Co-constructed by Anhui Province with Ministry of Education College of Energy ＆ Safety Anhui University of Science ＆ Technology Huainan 232001 China

Through analyzing experimental data of gas explosions in excavation roadwaysand the forecast models of the literature, Found that there is no direct proportional linearcorrelation between overpressure and the square root of the accumulated volume of gas,the square root of the propagation distance multiplicative ***, attenuation speedof the forecast model calculation is faster than that of experimental *** on theoriginal forecast models and experimental data, deduced the relation of factors by introducinga correlation coefficient with concrete volume and distance, which had been verifiedby the roadway experiment *** results show that it is closer to the roadway experimentaldata and the overpressure amount increases first then decreases with thepropagation distance.

关键词： excavation roadway gas explosion overpressure amount forecast model

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Characteristics of dust distributions and dust control measures around road-header drivers in mining excavation roadways

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Particuology 2021年第5期19卷 268-275页

作者： Shengyong Hu Yang Gao Guorui Feng Yisheng Huang He Shaoa Qi Liao Fei Hu College of Safety and Emergency Management Engineering Taiyuan University of TechnologyTaiyuan 030024China College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Green Mining Engineering Technology Research Center of Shanxi Province Taiyuan 030024China

In the present study,a numerical simulation method was adopted in order to examine the characteristics of dust dispersion during continuous dust release periods(CRP)and stop dust release periods(SRP).The purpose was to analyze the dust distributions and migration actions around road-header drivers in excavation roadways,and then determine effective dust control measures for underground coal *** study’s simulation results showed that the dust concentrations continuously increased,and then gradually reached a stability level during the *** that time,the locations of the drivers were always at the intersection of the original migration dust and the backflow dust,and the drivers were invaded by these two strands ***,during the SRP,the dust concentrations gradually decreased under the actions of the roadway ***,obvious backflow phenomena were observed around the road-header during the *** locations of the drivers were still within the backflow paths of the high dust *** the present time,dust separation and extraction systems have been implemented in coal mines,including vacuuming and air knife devices,which are designed to control the dust around the road-header *** field applications of these systems were conducted in the 26 mechanized excavation faces of the Zhangcun Coal *** results revealed that the use of these dust removal systems could effectively reduce the dust concentrations around the road-header *** the present study,the dust removal rates during the CRP and SRP were determined to reach up to 88.7% and 94.6%,***,the results of this research study provided effective theoretical guidance of the characteristics of dust distributions in coal mines,and introduced effective control methods for the hazardous dust concentrations around road-header drivers during the excavation process.

关键词： excavation roadway Road-header driver Dust distribution Dust control Numerical simulation

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Three-dimensional spatial and temporal distributions of dust in roadway tunneling

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International Journal of Coal Science & Technology 2020年第1期7卷 88-96页

作者： Haifei Yao Haiyan Wang Yanchuan Li Lei Jin Mine Safety Technology Branch of China Coal Research Institute Beijing 100013China State Key Laboratory of Coal Resource High Effective Mining&Clean Utilization China Coal Research InstituteBeijing 100013China

To study the three-dimensional spatial and temporal distributions of dust in tunneling roadways,and to solve the problems of inadequate time and limited number of monitoring points,this paper designs a device for the real-time monitoring and storage of data on the concentrations of dust at multiple measuring points in the same section of a *** proposed device can measure the total concentration of dust and that of respirable dust in real time at different instances and locations,and using different working *** measurements are used to study the temporal and spatial migration of *** results show that there was a sharp fluctuation zone 0–25 m from the heading face,about 25–40 m was high speed subsidence,beyond 40 m was gentle subsidence,The change of respiratory dust is much *** different distances from the heading face,the total dust concentration exhibited a process of“violent oscillation–rapid descent–stable descent,”while the respirable dust exhibited a process of“fluctuating ascent–gradual subsidence.”Changes in the concentrations of total dust and respirable dust dust were consistent at different positions in the same section of the *** concentration of dust near the wall was low,and those along the sidewalk and air duct of the roadway were slightly higher than in the *** concentration of dust farther down the air duct decreased more slowly than that in the remaining lines of *** amounts of dust featuring large particles settled *** concentrations of dust were observed to be intermittent,and the background value of dust concentration within 100 m of heading face was between 0.5 and 3 mg/m3.

关键词： excavation roadway Dust Real-time monitoring Spatial and temporal distribution

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