Three-dimensional spatial and temporal distributions of dust in roadway tunneling
作者机构：Mine Safety Technology Branch of China Coal Research InstituteBeijing 100013China State Key Laboratory of Coal Resource High Effective Mining&Clean UtilizationChina Coal Research InstituteBeijing 100013China
出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)
年 卷 期：2020年第7卷第1期
页 面：88-96页
核心收录：
学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学]
主 题：Excavation roadway Dust Real-time monitoring Spatial and temporal distribution
摘 要：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.
维普期刊数据库