摘要
为解决松散破碎围岩巷道持续变形的问题,采用现场调研、理论分析的方法,对松散破碎围岩巷道的变形机理进行研究,并结合数值模拟方法提出注浆方案与参数,现场试验后将原注浆方案优化为单排5孔几何布置的双循环注浆加固方案。结果表明:应用注浆压力为6 MPa,钻孔长度为3 m、排距为3 m,单排5孔几何布置的双循环注浆方案可有效降低窜浆堵孔现象发生的概率,并使浆液均匀分布,在注浆加固段巷道扩帮后可明显观察到浆液的扩散半径达到2.5 m,并形成了良好的骨架结构,有效提升了松散破碎围岩的承载能力。
In order to solve the problem of continuous deformation of loose and fractured surrounding rock roadways,the field investigation and theoretical analysis methods were used to study the deformation mechanism of loose and fractured surrounding rock roadways,and the grouting scheme and parameters were proposed in combination with numerical simulation methods.After the field test,the original grouting scheme was optimized into a double-cycle grouting reinforcement scheme with a single row of 5 holes geometrical arrangement.The results show that:the double-cycle grouting scheme with grouting pressure of 6 MPa,drilling depth of 3 m,row spacing of 3 m and geometric arrangement of 5 holes in a single row can effectively reduce the probability of the occurrence of channeling and plugging,and make the slurry evenly distributed.After expanding the roadway in the grouting reinforcement section,it can be clearly observed that the diffusion radius of the slurry reaches 2.5 m,and a good skeleton structure is formed,which effectively improves the bearing capacity of loose and fractured surrounding rocks.
作者
梁晓敏
郝兵元
LIANG Xiaomin;HAO Bingyuan(School of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《矿业安全与环保》
北大核心
2021年第2期12-17,共6页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(U1810104)
山西省自然科学基金项目(201901D111047)。
关键词
松散破碎围岩
变形机理
数值模拟
注浆加固
注浆参数
布孔方式
loose and fractured surrounding rock
deformation mechanism
numerical simulation
grouting reinforcement
grouting parameter
hole arrangement
