摘要
为研究综放采空区高位钻孔注浆不同注浆时间和注浆量对浆液空间扩散行为的影响,采用FLUENT数值计算方法,在"变重力、定倾角"注浆情况下,构建三维非均质采空区浆液扩散数学模型,以某矿29406工作面为研究对象,通过模拟分析确定单孔最佳注浆量为40 m^3/h时取得的防灭火效果最好,此时浆液倾向流动最远距离为50.8 m。研究表明:浆液在采空区垂直扩散过程中,其扩散半径逐渐增加且存在峰值;在底板扩散过程中,浆液浓度峰值点不会随时间产生明显改变;随注浆量的增加,浆液沿倾向流动的最大距离均呈非线性上升趋势;采空区标志性气体监测数据显示,模拟分析结果与现场应用效果一致。
In order to study effects of grouting time and amount on spatial diffusion behaviors of slurry in high-level borehole grouting in goaf,FLUENT numerical calculation method was adopted to construct a mathematical model of slurry diffusion in three-dimensional heterogeneous goaf under a condition of grouting with variable gravity and constant inclination.Then with 29406 working face of certain mine as a research object,it was confirmed through simulation analysis that fire prevention effect would be the best when grouting volume of a single hole is 40 m^3/h and the maximum distance that slurry tends to flow is 50.8 m.The research shows that diffusion radius of slurry increases gradually and would have a peak value during vertical diffusion in goaf while during diffusion at bottom plate peak concentration of slurry will not change significantly with time.And as grouting amount increases,the maximum distance at which slurry tends to flow along with inclination shows a nonlinear upward trend.According to indicating gas monitoring data of goaf,simulation analysis results are consistent with that of field application.
作者
王立杰
王继仁
张勋
郭晓阳
WANG Lijie;WANG Jiren;ZHANG Xun;GUO Xiaoyang(College of Mining,Liaoning Technical University,Fuxin Liaoning 123000,China;College of Safety Science and Engineering,Liaoning Technical University,Fuxin Liaoning 123000,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2019年第10期71-77,共7页
China Safety Science Journal
基金
国家自然科学基金资助(51604144,51574143)
辽宁省自然科学基金资助(20170540430).
关键词
高位钻孔
采空区
注浆
防灭火
浆液扩散
数值模拟
high position drilling
goaf
grouting
fire prevention
slurry diffusion
numerical simulation
