Research and Practice of Low Cost Filling Treatment Method in Large Empty Area
In response to the technical challenges of high investment and cost in treating old voids,this study combines the actual treatment of large voids in a certain iron mine.Utilizing the original surface large void observation holes and the ex-isting filling system,a simple,practical,and low-investment surface auxiliary pumping filling system was designed and construc-ted.Additionally,a flap-type gate mixer feeding device was invented and designed to complement this system.The study discov-ered severe vibration phenomena in the uphill pipeline of the pumping filling,proposing a vibration reduction method by fixing the pipeline with concrete piers.Through analyzing the filling characteristics of large voids,the concept of a thin-cake filling structure model was proposed.It is considered that designing the filling body strength too high is unnecessary and ineffective,hence suggesting the design recommendations to reduce the filling body strength and the filling ash-sand ratio.
governance of old goafunclassified tailing backfillingfilling systemvibration of filling pipelinestrength of filling bodyfilling ratio
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