摘要
裂隙岩体注浆扩散过程关系到注浆加固效果以及岩体稳定性评价,研究旨在提出一个反映裂隙场对注浆扩散影响规律的数值模型。基于平煤股份八矿钻孔窥视和工程地质资料,分析裂隙场统计分布规律。采用有限元计算软件COMSOL对不同裂隙长度、裂隙间距和裂隙开度情况下的注浆进行建模计算分析,通过蒙特卡洛随机算法重构二维随机裂隙场,建立随机裂隙岩体注浆数值分析模型,对巷道裂隙围岩注浆迁移扩散过程以及胶结加固进行模拟分析。模拟结果表明,浆液的扩散距离随时间的增大而增大。但裂隙网络的非均质性对浆液的扩散速率和范围变化有决定性影响,并使得浆液在5~8 m范围内形成注浆加固区域,有效改善了围岩稳定性,这与深部破碎围岩注浆加固实际情况基本一致。因此,新模型不仅可以很好的重构围岩裂隙分布特征,还可以更真实的反映裂隙场对注浆加固影响。
The grouting diffusion process of fractured rock mass was related to the grouting reinforcement effect and the evaluation of rock mass stability.Based on the drilling peeps and engineering geological data of the No.8 Mine of Pingmei Co.,Ltd.,the statistical distribution law of the fracture field was analyzed.The finite element calculation software COMSOL was used to model and analyze the grouting under the conditions of different fracture lengths,fracture spacings and fracture openings.The two-dimensional random fracture field was reconstructed by the Monte Carlo stochastic algorithm,and the grouting numerical value of the randomly fractured rock mass was established.The analysis model was used to simulate and analyze the grouting migration and diffusion process and cementation reinforcement of the surrounding rock of the roadway crack.The simulation results showed that the diffusion distance of the slurry increases with time.However,the heterogeneity of the fracture network had a decisive influence on the diffusion rate and range of the slurry,and made the slurry form a grouting reinforcement area within a range of 5~8 m,which effectively improved the stability of the surrounding rock,which was different from the deep broken surrounding rock.The actual situation of grouting reinforcement was basically the same.Therefore,the new model could not only reconstruct the fracture distribution characteristics of surrounding rock well,but also reflect the influence of fracture field on grouting reinforcement more realistically.
作者
孙兴平
陈建本
侯俊友
罗勇
刘靖毅
杨战标
SUN Xing-ping;CHEN Jian-ben;HOU Jun-you;LUO Yong;LIU Jing-yi;YANG Zhan-biao(Guqiao Coal Mine of Huainan Mining(Group)Co.,Ltd.,Huainan 232001,China;Ping′an Coal Mining Engineering Technology Research Institute Co.,Ltd.,Huainan 232001,China;Wuhan Institute of geotechnical mechanics,Chinese Academy of Sciences,Wuhan 430071,China;Pingdingshan Tian′an Coal Mining Co.,Ltd.,Coal Mining and Utilization Research Institute,Pingdingshan 467099,China)
出处
《煤炭科技》
2022年第3期68-74,共7页
Coal Science & Technology Magazine
基金
安徽省自然科学基金面上项目(2108085ME155)。
关键词
注浆
蒙特卡洛方法
裂隙岩体
数值模拟
grouting
Monte Carlo algorithm
fractured rock mass
numerical simulation
