Experimental Study on Ratio Optimization of Similar Materials for Underground Mining of Shendong Coalfield: A Case Study of Shangwan Coal Mine

Physical simulation is one of the effective methods to study mining problems, but selection and proportion materials are greatly affected by regional environment. This paper based on a multilevel orthogonal design test scheme using sand, lime, gypsum as in Shangwan coal mine Shendong coalfield, with sand cement ratio, paste ash maintenance days variables. The effect polar difference method strength density was used reference for physical coalfield. sensitivity analysis each factor carried out method, influencing factors were, descending order, mortar number days; days, ratio. ratio negatively correlated density, positively density. multivariate non-linear regression identified similar material proportioning equations which can improve accuracy be guide experiments