摘要
为了解决巷道湿喷混凝土作业粉尘污染问题,针对巷道湿喷作业现场的风流场和颗粒场特点,采用κ-ε模型并运用气固两相流理论建立了巷道湿喷作业风流-粉尘运移的数学模型,利用Fluent软件进行了数值模拟,通过与现场实测数据对比,发现模拟结果与实测数据相吻合。结果表明,湿喷产尘口下风侧0~6 m区域聚集了大量的高质量浓度粉尘云团,基本扩散至整个巷道断面,最低质量浓度高达12 mg/m3,湿喷产尘口下风侧6 m以后,高质量浓度粉尘云团消失,粉尘逐渐向巷道其他区域分散运移,但局部粉尘质量浓度依然高达30 mg/m3,直至湿喷口下风侧16.4 m以后,粉尘质量浓度迅速降低至3 mg/m3以下。由此提出了＂湿喷作业粉尘三区理论＂,并提出将参与搅拌、上料等作业程序的设备和人员布置在＂可接受粉尘区＂为最佳。
The present paper is aimed to ascertain the wind-dust doubled migration rules in the wet shotcreting roadway from the point of view of the particular features of the wind current field and that of the particles of the wet shotcreting roadway. For the said purpose,we have established a mathematical simulated model by applying the κ- ε model and the gas-solid two-phase theory to this research practice. At the same time,we have done a numerical simulation on the rules of the wind-dust migration in the aforementioned wet roadway with Fluent. And then,a detailed comparative analysis between the simulation results and the field data is done to find that both of them tend to follow the same variation tendency and regularity. The simulation results show that the wind dusts tend to diffuse most frequently in 0- 4 m downwind of the wet shotcreting dust source. If the 6 m and 16. 4 m cross-sections,downwind of the wet shotcreting dust source,can be regarded as two demarcation lines,we can find that the dust concentration begins to decrease twice sharply in the two different cross-sections respectively. To be exact,in the area from 0 to 6m downwind of the wet shotcreting dust source,it appears that a large amount of dust clouds gather together at a high concentration,which then spread to almost the entire cross section of the roadway in the scope,whereas the lowest concentration can go so far as to 12 mg / m3. On the other hand,in the area of the 6-16. 4 m downwind of the wet shotcreting dust source,the highly concentrated dust clouds tend to disappear and migrate little-bylittle dispersedly to other areas of the roadway,though certain local dust concentration may still stay as high as 30 mg / m3. Until beyond the range of 16. 4 m,the dust concentration can quickly be reduced to below 3 mg / m3. Based on the above conclusion of observation and discovery,we have proposed a＂three zones theory of wet shotcreting dust＂,which can be stated as follows： the three zones can respectively be named as ＂the dust safety alert zone＂,＂the dust safety warning zone＂ and ＂the dust acceptable zone＂. Thus,it can also be concluded that＂the dust safety alert zone＂ is the key area of the dust control and prevention in wet shortcreting roadway. What is more,under the actual in-situ wet shotcrete operational condition,it is recommended to arrange the operational device and equipment as well as the workers in ＂the dust tolerable zone＂ in hoping to reduce the dust pollution.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2015年第5期73-77,共5页
Journal of Safety and Environment
基金
国家自然科学基金重点项目(U1261205)
国家自然科学基金面上项目(51474139)
国家自然科学基金青年基金项目(51204103
51404147)
国家高等学校博士学科点专项科研基金项目(20113718110005)
山东省科技发展计划项目(2013GSF12004)
关键词
环境工程学
气固两相流
巷道湿喷作业
数值模拟
现场实测
environment engineering
gas-solid two-phase
wet shotcreting roadway
numerical simulation
insitu test
