Research on Rapid Excavation Technology of Mining Roadway under Goaf in Close Distance Coal Seam
In light of the presence of close distance coal seam groups in Shangyuquan coal mine and considering the impact of the goaf of No.9 coal seam overhanging I031005 mining roadway,a comprehensive technology system of"optimization of bolt support parameters+improvement of equipment optimization of process flow"is put forward through the combination of field investigation,numerical simulation and theoretical analysis while ensuring the stability of the surrounding rock of the mining roadway.The results indicate that a comprehensive evaluation system is constructed to identify the significant factors influencing the excavation speed based on the Analytic Hierarchy Process(AHP).The roadway of the No.10 coal seam is essentially not impacted by the concentrated stress of the coal pillar remaining from the No.9 coal seam,and the surrounding rock possesses good integrity and high strength.The stability of the surrounding rock of the mining roadway will not be affected by appropriately enhancing the strength of a single bolt and reducing the row spacing between the bolts.The reasonable row spacing between the bolts is 1 500 mm×1 200 mm,and the length of the bolts is 1 800 mm.After the optimization of support parameters,the support time is notably reduced,with the support time of the tunnel single row decreasing from 30 min to 22 min,and the circulation footage of single excavation anchor increasing to 1.2 m.The structure of the sliding frame connected with the cutting device is proposed,and the cycle operation mode is optimized to enable the digging anchor to work synchronously,and the parallel operation rate of the digging branch can be increased by 42.7%.The average monthly tunnel footage can be elevated from 750 m to 1 080 m,an increase of 44%.The research findings can offer references for the rapid excavation of mining roadways under similar conditions.
close distance coal seammining roadwayrapid excavationoptimization of support parameteroptimization of construction technology
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