Research and application of raise-boring construction technology for ventilation shaft in phosphate mine
The return air shaft project of Xinqiao Phosphate Mine No.2 shaft of Guizhou Fulin Mining Company Limited adopted the drilling method of raise boring machine.The raise-boring machine could excavate a shaft with a diameter of 3.5 m in one operation.Based on the analysis of the core data of ge-ological inspection hole provided by the mine,the working parameters such as reaming tension and torque of raise-boring machine were studied and calculated under this stratum condition.Finally,the technical scheme combining TSJ-2000 water source drilling rig and BMC400 raise-boring machine was selected to carry out the pilot hole and the one-time reaming well.During the construction process,practical difficulties such as lack of experience in similar projects and lack of stratum development data were overcome to ensure that the shaft penetration was successfully completed and the shaft slope was controlled within 0.3％.The practice proved that it was feasible to use raise-boring machine to con-struct large diameter shaft excavation in the return air shaft project of phosphate mine,and provided valuable experience for such large diameter shaft excavation projects.
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