Abstract
The experiment uses lime, desulfurization ash, slag and other solid wastes with mirabilite and NaOH as the admixture for Jinchuan mine rod milling sand to get a new backfill cementing materials that can replace the cement materials. There obtains the influence of activators to strength of the new backfill cementing materials’ body through the orthogonal experiment. The MATLAB genetic programming is exploited for getting the regression function of compressive strength and shrinkage rate for the new backfill cementing materials. Using the genetic algorithm to optimize the constrained regression functions that can get the best combinations of the activators, Finally. The results show that the compressive strengths (28d, 7d, 3d) of new backfill cementing materials are 6.73MPa, 4.03MPa and 1.00MPa when the lime, desulfurization ash, mirabilite, NaOH and slag are 7.05%, 16.32%, 3.062%, 1.08% and 72.48%. The optimal results conform to the requirements of the Jinchuan mine filling strength, which lays a foundation for further industrial test of new backfill cementing materials in Jinchuan mine.
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