摘要
为解决大埋深山岭双护盾TBM管片开裂漏水、接缝渗漏等结构病害,本文提出一种高水压下可排水式管片衬砌,结合注浆加固圈的堵水作用,并根据管片背后孔隙水压监测情况增设泄水孔,用以消减管片背后的水压力。本文以某高水压TBM隧道为例,通过孔隙水压力理论和流固耦合数值分析,对管片背后孔隙水压力分布规律及降压效果进行研究。结果表明,Ⅲ~Ⅴ级围岩级别条件下,管片衬砌所能承受的最大水头高度依次为102 m、90 m和78 m;全封堵情况下,注浆圈的施作起到堵水作用,但对管片衬砌背后水压影响较小,孔隙水压力大小近似为静水压力;开设泄水孔有效降低了衬砌背后孔隙水压,尤其能有效折减隧底水压;泄水管的影响半径为4.5m(水压降低至1 MPa),拱部泄水管的增加对管片背后水压的减小效果明显,并将管片承受水压控制在1 MPa以下。本文研究成果可为富水山岭双护盾TBM隧道设计提供参考。
To address structural defects such as water leakage through cracks and joint seepage in double-shield TBM segments in deeply buried mountain tunnels,this paper proposed a high-water-pressure-resistant drainage segment lining system.By leveraging the water-blocking effect of the grouting reinforcement layer and setting drainage holes based on pore water pressure monitoring behind the segments,this system can reduce water pressure.Taking a high water pressure TBM tunnel as a case study,this paper investigated the distribution patterns of pore water pressure behind the segments and the effectiveness of pressure reduction through pore water pressure theory and fluid-solid coupling numerical simulations.The results indicate that under Grade III to V surrounding rock conditions,the maximum water head heights that the segment lining can withstand are 102 m,90 m,and 78 m.Under fully sealed conditions,the grouting layer effectively blocks water infiltration but minimally influences pore water pressure behind the lining,which approximates hydrostatic pressure.Drainage holes significantly reduce pore water pressure behind the lining,particularly mitigating water pressure at the tunnel invert.Drainage pipes exhibit an influence radius of 4.5 m(with water pressure reduced to 1 MPa),while increasing drainage pipes in the tunnel crown substantially diminishes pore water pressure behind segments,maintaining bearing pressure of segments below 1 MPa.These findings provide critical guidance for designing double-shield TBM tunnels in water-rich mountainous areas.
作者
熊聪聪
张朋宽
潘朋
赵万强
徐文蕴
XIONG Congcong;ZHANG Pengkuan;PAN Peng;ZHAO Wanqiang;XU Wenyun(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《高速铁路技术》
2025年第5期72-78,共7页
High Speed Railway Technology
关键词
高水压TBM隧道
泄水式管片
流固耦合
孔隙水压
high water pressure TBM tunnel
drainage segment
fluid-solid coupling
pore water pressure
