Study on the"five-in-one"mining method of coal gangue grouting and filling in separated bed
In order to solve the difficulties affecting efficient coal mining including gangue disposal,disaster management and ecological protection,the five-in-one safe and green mining method featuring isolated grouting-filling for overburden rock and waste disposal,rockburst prevention,vibration damping,water preservation and subsidence reduction is proposed for one-million-tons scale coal gangue disposal.A step-type self-flowing slurry production and transportation method is put forward,which solves the problems in large-scale processing,system stability and energy saving,land occupation and long-distance transportation.The technology process was tested in the Hulusu Coal Mine.In the filed test,the production capacity achieved 700000 t/a in the first phase,and would reach 1.5 million t/a after the second phase project commissioning,which saved about 17.3 million yuan in the cost of gangue and water disposal,brought a 52.9%～53.2% decline in the surface subsidence amount of the slurry filling area,a decline of 17.7%～29.1% in the average water influx in the working face,a decline of 774(30.5% )in the number of rock burst energy event.The test project has achieved great results in terms of economy,safety and environmental protection.
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