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| Research and application of key parameters of roof cutting and pressure relief retaining roadway under high ground stress |
| Ding Kunpeng1， Wang Lei2， Liu Dake3， Fan Zhigang4 |
1. Henan Polytechnic Industrial Technology Research Institute, Jiaozuo 454000, China; 2. Comprehensive
Utilization China Pingmei Shenma Group Safety Supervision Department, Pingdingshan 467099, China; 3. China Nonferrous Metals Int'l Mining Pakrut LLC, Beijing 100029, China; 4. China Coal Technology and Engineering Group Shenyang
Research In-stitute, Fushun 113122, China |
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Abstract Aiming at the serious deformation problem of gob-side entry retaining roadway in Pingmei No.6 Mineworking face, the mechanism of roof cutting and pressure relief gob-side entry retaining was revealed by means of theoretical analysis and field measurement, and reasonable roof cutting and pressure relief parameters were determined and field practice is carried out. The research showed that the roof cutting and pressure relief made the cantilever length of the basic roof shorter, and the static load of the roadway roof becomes smaller. At the same time, the cutting backward block filling goaf played a supporting role in block B, which reduced the disturbance and additional load to the roadway. Based on theoretical calculation and engineering experience, the position, dip angle and spacing of the roof cutting borehole were determined. After roof cutting and pressure relief, the deformation of roadway side and roof and floor was 8.5 % and 23.2 % respectively. After repair, the net width of roadway was 4 150 mm and the net height was 2 550 mm. During the reuse period, there was no obvious deformation of roadway, and the pressure relief effect was good. The research results could provide reference for the safe mining of working face under similar conditions.
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