摘要
为了研究淋水软弱巷道注浆加固与封堵围岩过程中浆液渗透扩散机理并优化注浆参数,采用流固耦合数值分析方法探索浆液在岩体中的运动扩散规律,并给出合理注浆压力、时间与浆液水灰比;基于弹塑性与渗流理论分析水渗透压作用下注浆加固半径与塑性区大小关系,确定合理注浆深度。研究结果表明:高水黏度时变特性浆液在岩体中的扩散范围随着压力、水灰比和注浆时间增加而增大,针对石碣峪矿井地质生产条件,合理注浆压力为2.5 MPa,水灰比为2∶1,注浆时间约为30 min;随注浆半径增大塑性区半径减小,但减幅变小,得出合理注浆半径约为10.29 m;在注浆半径5.5 m、渗流压力0.5 MPa下,巷道围岩塑性区半径为2.84 m,大于无渗流塑性区半径2.10 m;在深孔锚索注浆治理淋水软弱巷道中采用优化后的注浆参数,取得了良好的效果。
In order to study the penetration,diffusion mechanism and parameter optimization in the process of grouting reinforcement and sealing of drenching and soft roadway,firstly,the fluid-solid coupling numerical analyses were applied to explore the principle of slurry motion and diffusion in the rock mass,and the reasonable grouting pressure,time and water-cement ratio were given.Then based on the elastic-plastic and seepage theory,the relationship of grouting reinforcement radius and size of plastic zone was analyzed under the osmotic pressure to determine reasonable grouting depth.Research results showed that:Diffusion range of high-water viscosity time-dependent slurry increased with the grouting pressure,water-cement ratio and time in the rock mass,and the reasonable grouting pressure was 2.5 MPa;water-cement ratio was 2∶1;grouting time was about 30 min under geological conditions of the SXJ production.The radius of plastic zone decreased with the increase of grouting radius but the decrement become low,it concluded that the reasonable grouting radius was about 10.29 m.The radius of the plastic zone around the roadway under the osmotic pressure of 0.5 MPa and the grouting raduis of 5.5 m was 2.84 m greater than the radius of 2.10 m under non-seepage pressure.The optimized grouting parameters were applied to the treatment of surrounding rock of drenching and soft roadway using deep-hole anchorage grouting technology,and the good results had been achieved.
作者
何文瑞
何富连
张坤
徐祝贺
He Wenrui;He Fulian;Zhang Kun;Xu Zhuhe(College of Resources and Safety Engineering,China University of Mining and Technology,Beijing 100083,China;State Key Laboratory of Coal Resources and Mine Safety,Xuzhou Jiangsu 221116,China)
出处
《矿业科学学报》
2019年第3期221-229,共9页
Journal of Mining Science and Technology
基金
国家自然科学基金(51574243)
中国矿业大学(北京)越崎杰出学者奖励计划(800015Z1138)
中央高校基本科研业务费专项资金(800015J6)
关键词
淋水软弱巷道
注浆
扩散机理
塑性区
参数优化
drenching and soft roadway
grouting
diffusion mechanism
plastic zone
parameter optimization
