Analysis of the influence of gradation on the strength of a cemented filling body and the cementation strength model

摘要

Backfill mining can effectively improve the environment and protect resources. In the filling mining method, the gradation of filling aggregate is the most important aspect. The filling gradation of waste rock + wind sand and waste rock + river sand in the No. 2 mining area of the Jinchuan company was quantitatively described by the fractal equation of filling gradation. The effect of gradation on bonding strength was studied through a laboratory bonding strength test. The results show that the fractal dimension of filling aggregate gradation has a quadratic function relationship with the bonding strength, and there is an optimal extreme value of the bonding strength. The optimal cement strength can be quantitatively calculated by regression analysis, which provides guidance and a basis for the grading design of filling aggregate.