Stope Span Enlargement Technology with the Drifted Method Supported by the Prestressed Expandable Pillar

doi:10.12068/j.issn.1005-3026.2023.11.013

Abstract

Abstract: In order to improve the production capacity of ore， the stope span enlargement technology of upward drift-and-fill mining method is developed. Numerical simulations reveal that， compared with the natural pillar， the use of expandable pillar support results in a 10mm increase in vertical deformation of roof and a 15.8m³ expansion in the volume of the plastic zone. Compared with no support， the expandable pillar support effectively limits the maximum vertical displacement of roof to 13mm and reduces the volume of plastic zone by 160.1m³. A field industrial test is carried out to monitor the bearing load of prestressed expandable pillars and the vertical deformation of stope roof. The deformation of roof and the bearing performance of expandable pillar increase with the recovery of rib pillar， the maximum bearing load on prestressed expandable pillars does not exceed 655.6kN， and the maximum deformation of the stope roof is below 10 mm. From a technical and economic standpoint， the profit of test stope is 267000 yuan， the stope span enlarges from 3 to 9m， and the ore recovery rate improves by 30%.

Key words: expandable pillar; drift-and-fill mining method; stope span; deformation of roof; pillars bearing

CLC Number:

TD355

LI Kun-meng， YU Peng-fei， JIANG Kai-yuan， LI Yuan-hui. Stope Span Enlargement Technology with the Drifted Method Supported by the Prestressed Expandable Pillar[J]. Journal of Northeastern University(Natural Science), 2023, 44(11): 1604-1611.

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