In recent years,the application of filling mining technology has become more extensive,and the exploration of filling body performance has become more thorough.It is found that the temperature of backfill slurry has a significant influence on the working performance of filling body.In order to explore the influence of temperature on the performance of filling body and effectively reduce the filling cost,this paper adopts the orthogonal design method to carry out the strength and flow charac-teristics experiments of the filling body with fly ash cement tail sand,and establishes the regression prediction models of early compressive strength and slurry slump of filling body under different temperature effects,so as to reveal the law of the influence of the slurry temperature on the pipeline transportation performance of the filling slurry and the mechanical performance of the filling body.The study results show that all factors have a significant impact on the compressive strength of backfill,and the slurry temperature has an extremely significant impact on the strength.The sensitivity degree is in the order of slurry tempera-ture,mass concentration and fly ash content.The strength of backfill gradually increases with the increase of slurry temperature and mass concentration,and decreases with the increase of fly ash content.Both mass concentration and slurry temperature have great influence on slurry slump,while fly ash content has little influence.
关键词
充填开采/料浆温度/抗压强度/流动性/回归模型
Key words
filling mining/slurry temperature/compressive strength/liquidity/regression model
维普
万方数据