摘要
在大同煤矿双系特厚煤层开采中,采用含骨料浆液注浆充填技术封堵岩层裂隙,能够减轻采动对裂隙的扰动以及降低破碎岩体的导水性能,是预防老空水、有害气体下泄以及防止采区垮塌的关键措施。利用矿山固废粉煤灰作为绿色充填材料,可以实现固废资源的再利用。本文基于欧拉双向耦合模型,利用Fluent和Edem软件的耦合功能,构建了CFD-DEM耦合模型,分析骨料颗粒在裂隙中随浆液的运移、沉积行为及其对浆液流动速度的影响。研究发现:较小粒径和较低密度的骨料颗粒迁移距离较远,且相较于密度,粒径是影响骨料沉积速率的更重要因素;在迁移过程中,各粒径和密度的骨料固相比均呈现先增加后减少的趋势,沉降率随运移距离的增加而逐渐增大,且在相同位置,密度更大的骨料表现出更高的沉降率。研究结果为矿山固废充填材料的合理利用及注浆封堵技术的改进提供了理论依据。
In the mining of double-system extra-thick coal seams in Datong Coal Mine,the use of aggregate-containing slurry grouting filling technology to seal rock fractures can reduce the disturbance of mining to fractures and reduce the water conductivity of broken rock masses.It is a key measure to prevent goaf water and harmful gas leakage and prevent collapse of mining areas.Using mine solid waste fly ash as green filling material can realize the reuse of solid waste resources.Based on the Euler two-way coupling model,the CFD-DEM coupling model was constructed by using the coupling function of Fluent and Edem software.The migration and deposition behavior of aggregate particles in cracks with slurry and its influence on slurry flow velocity were analyzed.It is found that the aggregate particles with smaller particle size and lower density have a longer migration distance,and the particle size is a more important factor affecting the aggregate deposition rate compared with the density.During the migration process,the aggregate-solid ratio of each particle size and density shows a trend of increasing firstly and then decreasing.The sedimentation rate gradually increases with the increase of the migration distance,and at the same position,the aggregate with higher density shows a higher sedimentation rate.The research results provide a theoretical basis for the rational utilization of mine solid waste filling materials and the improvement of grouting plugging technology.
作者
杨旭凡
熊益
谢孟琦
曹正正
YANG Xufan;XIONG Yi;XIE Mengqi;CAO Zhengzheng(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《绿色矿冶》
2024年第6期13-21,共9页
Sustainable Mining and Metallurgy
基金
河南省自然科学基金资助项目(242300421246)
河南省双一流学科建设专项项目(AQ20240724)
河南理工大学青年骨干教师资助项目(2023XQ G-01)。
关键词
注浆充填
骨料迁移
沉降率
固相比
grouting filling
aggregate migration
settlement rate
solid ratio
