Ratio optimization of fly ash-cement dual liquid grouting materials
The application of dual fluid grouting materials in the treatment of fractured surrounding rocks in coal mines is quite extensive.In order to obtain dual liquid grouting materials with fast setting speed and low cost,this paper takes fly ash,cement,water glass,water reducing agent and early strength agent as raw materials.Based on the orthogonal experiment scheme,four factors such as powder to cement ratio,glass to slurry ratio,water reducing agent content and early strength a-gent content are studied to explore the influential law of grouting material viscosity,setting time and compressive strength,and a regression model is established using DPS software.Through Matlab genetic algorithm,15 groups of optimal ratio were obtained,and finally the industrial ratio was determined considering the cost.The results show that the properties of grouting materials are not only affected by a single factor,but also by the interaction between the two factors.The industrial ratios:powder to cement is 0.126,glass to pulp is 0.35,water reducing agent content of 1.35‰,early strength agent content of 1.85％,the viscosity of 518 mPa·s,setting time of 23 s,and 28 d compressive strength of 11.10 MPa,and the difference with the predicted value is small,the cost is low,and the performance requirements of grouting materials on site are met.
surrounding rock treatmentdual liquid grouting materialorthogonal experimentfly ashcompressive strengthratio optimization
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