Study On Settlement Law Of Unclassified Tailings And Waste Rock Compound Filling Body In Huibaoling Iron Ore

With the theories of granular mechanics and fluid mechanics, physical and mechanicalproperties of tailings, waste rock and cemented backfill were analyzed. Changes ofmicromechanics of tailings, waste rock and cemented backfill were also studied. Combinedwith the macroscopic laboratory tests and Geo-studio numerical simulation, the settlementcharacteristics of unclassified tailings and waste rock compound filling body of differentcompound ratio were studied comprehensively, the main research contents are as follows:(1)According to the relevant literature and testing standards, the important parameters ofunclassified tailings and waste rock in HuiBaoLing iron mine, such as physical properties,gradation composition, mineral composition and mechanical properties were tested, whichprovides parameter support for indoor tests and numerical simulation.(2)Regression orthogonal combination experimental design and implementation andMATLAB programming theory were used to study the rheological properties and optimal mixratio of unclassified tailings paste backfill slurry. When cement dosage10.5percent andfilling concentration75percent of the unclassified tailings paste backfill which is botheconomical and practical.(3)By laboratory tests, I analyzed the time dependence and different ratio of waste rockof compound filling body settlement laws, under static loads, the total settlement amount ofunclassified tailings is significantly greater than the waste rock backfill. In each trial, theinitial settlement of backfill is relatively large, approaching a stable value gradually with timeincreasing. After15days, cemented backfill at the top meets stability requirements. By usinglinear fitting, the relationship between settlement amount of backfill and time followsLogarithmic relationship. The stability of speed of compound filling body achieve to fasterwhen waste rock accounted for1/2.(4)With the geo-studio numerical simulation technology, ground stress and different ratioof waste rock factors which affect the settlement of compound filling body were analyzed. Isimulated the settlement law of compound filling body with different ratio of waste rock inroom2D size with70m×30m. The simulated settlement law and lab settlement law arerelatively similar. To a certain extent, indoor model tests reflect the actual settlement law,which provides important theoretical basis for engineering practice in mines.