Development Status of Backfilling Technology Using Raw Waste in Coal Mining

In this paper,technological system for coal mining with raw waste backfilling technology is summarized;system layout,key equipments and backfilling technics of coal minning with raw waste in fully-mechanized coal mining,conventionally-mechanized coal mining technology and waste backfilling with driving are presented.In addition,the deep feed-drill system carrying the waste from surface to underground is invented and optimized for this purpose.Taking coal minning with raw waste in fully-mechanized coal mining as an example,we build an equivalent mining thickness model to analyze rock pressure behavior under the condition of coal minning with waste backfilling technology so as to obtain the supporting intensity of stope and the correction factor η between the raw waste backfilling with fully-mechanized coal mining technology and the conventional one.The calculation and on-the-spot survey results show that the pressure behavior and surface deformation decrease to a certain extent.Finally,we hold that more attention should be paid to achieve the coal mining with raw waste backfilling technology,such as the basic research,the key technology.