During the treatment process of the No.2 water inflow area in Nanshan Coal Mine,a large flow of high-pressure water gushed out from a grouting hole,due to long-term exposure to roof wa-ter,the stability and strength of the roadway roof decrease,posing a safety hazard to the original hole pipe.By installing a new borehole pipe deep into the stable bedrock within the original borehole,the a-bove-mentioned problems were solved through the"wall grouting and pipe fixing method",the new orifice pipe can withstand a pressure of 4.8 MPa during the water pressure test,and the subsequent grouting and water blocking construction was successfully completed.This method is suitable for grouting operations with water or when the original orifice pipe fails,and can be used as a reference for similar engineering design and construction.
关键词
顶板淋水/注浆加固/大量涌水/壁间注浆固管/孔口管
Key words
roof water spray/grouting reinforcement/massive influx of water/grouting and fixing pipes between walls/orifice pipe
维普
万方数据