淋水软弱巷道注浆加固扩散机理与参数优化的研究
Diffusion mechanism and parameter optimization in the process of grouting reinforcement of drenching and soft roadway
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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*5MPa,水灰比为2∶1,注浆 时间约为30min;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*29m; 在注浆半径5*5m、渗流压力0*5MPa下,巷道围岩塑性区半径为2*84m,大于无渗流塑性区半 径2*10m;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。Abstract: In order to study the penetration,diffusion mechanism and parameter optimization in the processofgroutingreinforcementandsealingofdrenchingandsoftroadway,firstly,thefluid⁃solidcou⁃ plingnumericalanalyseswereappliedtoexploretheprincipleofslurrymotionanddiffusionintherock mass,andthereasonablegroutingpressure,timeandwater⁃cementratioweregiven*Thenbasedonthe elastic⁃plasticandseepagetheory,therelationshipofgroutingreinforcementradiusandsizeofplastic zonewasanalyzedundertheosmoticpressuretodeterminereasonablegroutingdepth*Researchresults showedthat:Diffusionrangeofhigh⁃waterviscositytime⁃dependentslurryincreasedwiththegrouting pressure,water⁃cement ratio and time in the rock mass,and the reasonable grouting pressure was 2*5MPa;water⁃cementratiowas2∶1;groutingtimewasabout30minundergeologicalconditionsoftheSXJproduction*Theradiusofplasticzonedecreasedwiththeincreaseofgroutingradiusbutthe decrementbecomelow,itconcludedthatthereasonablegroutingradiuswasabout10*29m*Theradius oftheplasticzonearoundtheroadwayundertheosmoticpressureof0*5MPaandthegroutingraduisof 5*5mwas2*84mgreaterthantheradiusof2*10mundernon⁃seepagepressure*Theoptimizedgrou⁃ tingparameterswereappliedtothetreatmentofsurroundingrockofdrenchingandsoftroadwayusing deep⁃holeanchoragegroutingtechnology,andthegoodresultshadbeenachieved*