Principle of fully mechanized gangue-throwing filling technology and the sand-throwing test
In view of the difficulties in surface subsidence control and solid waste disposal in mines,a fully mechanized gangue-throwing filling technology of"throwing instead of tamping"was proposed.Based on the principle of gangue-throwing filling technology,the mathematical model of gangue-throwing movement was constructed,and the basic parameters of gangue filling were obtained.On this basis,a simulation platform for gangue-throwing backfilling was built to carry out on-site sand throwing tests,and the feasibility of fully mechanized mining gangue-throwing filling technology and the rationality of parameters were studied.The results show that:firstly,the measured values and variation rules of each parameter in the process of gangue-throwing are close to the theoretical values,the field design can be guided by theory;secondly,when the throwing angle is 50° and the throwing speed is greater than 8m/s,it can meet the filling demand;thirdly,the overall filling rate of gangue filling can exceed 95%,and the accumulation angle of gangue is obviously higher than that of natural accumulation,achieving favorable filling effect.
gangue-throwing fillingsolid waste disposalthrowing parameterssimulation test
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