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| Research on gas control technology of upper corner by large diameter borehole |
| Yang Shuai |
| Shanxi Tiandi Wangpo Coal Industry Co., Ltd., Jincheng 048021, China |
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Abstract In order to solve the problem of gas concentration exceeding the limit in the upper corner of the return air in 3306 working face of Wangpo Coal Mine, a large-diameter drilling (φ550 mm ) goaf drainage technology is adopted to cut off the gas supply in the goaf and change the air flow field near the upper corner, reduce the gas concentration in the upper corner, and form a set of large-diameter drilling hole forming technology. The results show that the gas volume fraction in the return air corner of 3306 working face is 0.08% ~ 0.49%, with an average of 0.29%. The volume fraction of gas return air flow is 0.06% ~ 0.37%, with an average of 0.22%, which effectively controls the problem of gas overrun in the return air corner.
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