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- W2386964598 abstract "According to the technical problems of the coal and rock long boreholes passing through the mudstone,tectonic zone and soft seam,based on the site measured coal and rock physical parameters,the FLAC3Dsoftware was applied to the numerical simulation on the technical conditions of the gas drainage boreholes in No.11-2 air return gateway of -910 m level at Dingji Mine.The borehole stress field,displacement field and the variation law of the plasticity failure zone were obtained from the simulation.The simulation found that the largest displacement was at the top section along the vertical direction of the borehole,the less displacement was at the low section a-long the vertical direction of the borehole and the smaller displacement was at the two sides of the borehole.The final shape of the borehole was oblate.A comparison analysis was conducted on the stress,strain,displacement and the parameters before the consolidation of the borehole surrounding rock.The recovered coefficients of the coal and rock strength after the consolidation would be 5%～60%.The softer of the previous coal and rock mass,the strength recovered coefficients would be higher.Based on the grouting consolidation borehole forming theory,the pressurized consolidated agent was grouted in the boreholes of the soft coal and rock layer with a interval of the borehole rows and single borehole repeated grouting,a grouting pressure of 0.4～0.8 MPa and a water and cement ratio of 2:1.The results showed that the method could improve the capacity of the coal and rock soft structure to resist the deformation." @default.
- W2386964598 created "2016-06-24" @default.
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- W2386964598 date "2010-01-01" @default.
- W2386964598 modified "2023-09-27" @default.
- W2386964598 title "Grouting and Borehole Drilling Technology for Gas Drainage in Deep Mine Coal and Rock with Weak Structure" @default.
- W2386964598 hasPublicationYear "2010" @default.
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