摘要
考虑巷道开挖扰动和注浆压力衰减对浆液渗透扩散规律的影响,基于拟连续介质假设,利用渗流力学理论推得围岩扰动应力和注浆压力耦合作用下的浆液非稳态渗透扩散基本方程;并运用多场耦合软件COMSOL建立了锚注浆液在围岩中渗透扩散的数值计算模型,系统研究了注浆时间、注浆压力以及注浆锚杆间距等锚注参数对浆液渗透扩散的影响。其结果表明:延长注浆时间可以减缓浆液压头在渗透扩散过程中的衰减而增大浆液在围岩中的扩散半径;注浆锚杆间距与浆液扩散半径之比小于等于1.41时,浆液将在巷道全断面围岩内形成完整注浆加固圈。最后将以上研究成果用于淮北袁店一矿新掘巷道的锚注加固设计中,经现场监测证明其有效地控制了巷道围岩的变形与破坏。
In response to the effects of roadway excavation disturbance and grouting pressure decay on the law of slurry penetration and diffusion, an unsteady seepage diffusion basic equation of slurry within surrounding rocks under coupling effect of disturbance stress and grouting pressure has been derived by using seepage flow mechanics theory based on the quasi continuum hypothesis. A numerical calculation model of slurry penetration and diffusion within surrounding rocks during bolt-grouting process has been established by using COMSOL software. The effects of grouting time, grouting pressure and grouting bolt interval on the slurry penetration and diffusion have been systematically studied. The results show that prolonging grouting time can slow down the attenuation of the hydraulic slurry head during the diffusion process, but increase the diffusion radius of the slurry within surrounding rocks at the end. The grouting slurry will form a whole grouting reinforced circle in surrounding rocks when the ratio of grouting bolt interval to slurry diffusion radius is less than or equal to 1.41. Finally, these results have been applied to the design of roadway bolt-grouting supports in the Yuanyi coal of the Huaibei mine. The field monitoring proves that the bolt-grouting method effectively controls the deformation and damage of roadway surrounding rock.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2015年第2期240-246,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51274191
51204159)
国家重点基础研究发展计划(973)项目(2014CB046905)
教育部博士点基金项目(20130095110018)
关键词
扰动应力
全断面锚注
渗透扩散
锚注参数
注浆加固圈
disturbance stress
whole section bolt-grouting
penetration diffusion
bolt-grouting parameters
grouting reinforced circle
作者简介
黄耀光（1985-），男，四川省南充市人，博士研究生，主要从事岩石力学与采矿工程方面的理论分析及数值模拟研究。
通信作者：王连国E-mail：cumt_lgwang@163．com Tel：0516-83885205
