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Feasibility Research on Gas Drainage by Large Diameter Bend Borehole Replacing Tunnel

Zhou Xin-li

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Abstract

Drilling techniques of large diameter bend borehole which was the replacement of slant tunnel for gas discharge were researched in Yangquan.Total six test boreholes were drilled.The average deflecting intensity of bend borehole was up to 1.2°/m.The total depth of six boreholes was up to 378.55 m.The result comparison shown that the gas discharge effects were nearly the same by large diameter bend boreholes and tunnel.Therefore the possibility of using large diameter borehole to replace slant tunnel was possible.

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What this paper is about

Drilling techniques of large diameter bend borehole which was the replacement of slant tunnel for gas discharge were researched in Yangquan.Total six test boreholes were drilled.The average deflecting intensity of bend borehole was up to 1.2°/m.The total depth of six boreholes was up to 378.55 m.The result comparison shown that the gas discharge effects were nearly the same by large diameter bend boreholes and tunnel.Therefore the possibility of using large diameter borehole to replace slant tunnel was possible.

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Available abstract

Drilling techniques of large diameter bend borehole which was the replacement of slant tunnel for gas discharge were researched in Yangquan.Total six test boreholes were drilled.The average deflecting intensity of bend borehole was up to 1.2°/m.The total depth of six boreholes was up to 378.55 m.The result comparison shown that the gas discharge effects were nearly the same by large diameter bend boreholes and tunnel.Therefore the possibility of using large diameter borehole to replace slant tunnel was possible.

Key concepts: Borehole, Geology, Drilling, Drainage, Geotechnical engineering, Materials science, Metallurgy, Ecology

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