三模式掘进机全断面岩层段TBM模式施工技术研究

Tunneling Technology of Three-Mode Tunnel Boring Machine Under TBM Mode in Full-Section Hard Rock

为研究三模式掘进机使用TBM模式在全断面岩层中的施工技术,以广州地铁7号线二期萝岗站—水西站盾构区间工程为研究背景,分别从出渣方式、掘进参数控制、刀具管理和稳定器应用4个方面对三模式掘进机TBM模式施工技术进行总结。结果表明:1)本工程中三模式掘进机使用镶齿滚刀施工,相对光面滚刀的消耗更少,刀盘转矩更低;2)三模式掘进机TBM模式采用泥浆循环和螺旋输送机双通道出渣,可显著降低泥浆管堵塞的概率,提高出渣效率;3)三模式掘进机在前盾、中盾安装稳定器和撑靴,可保证全断面硬岩地层中掘进盾体不发生滚动,同时增强盾体稳定性;4)在全断面岩层中采用三模式掘进机TBM模式开挖隧道,刀盘转速为3.0 r/min,总推力约15000 k N,转矩可控制在1300 k N·m,推进速度为8~12 mm/min。

In this study,a detailed analysis is conducted on the shield section project from Luogang station to Shuixi station of the PhaseⅡof the Guangzhou metro line 7.The tunneling technology employed by the three-mode tunnel boring machine in full-section hard rock under TBM mode is examined.Furthermore,various aspects,including mucking mode,driving parameter control,cutter management,and stabilizer application,are evaluated.Results reveal the following key points:(1)Using toothed disc cutters in the three-mode tunnel boring machine results in lower cutter consumption compared to smooth disc cutters,accompanied by reduced cutterhead torque.(2)The implementation of mud circulation and double-channel mucking via screw conveyors substantially minimizes mud pipe blockage issues and enhances mucking efficiency.(3)Strategically positioned stabilizers and grippers on the front and middle shields,respectively,ensure shield body stability during boring operations in hard rock strata.(4)Optimal operation parameters for tunneling in full-section hard rock strata include a cutterhead rotation speed of 3.0 r/min,total thrust force of 15000 kN,thrust speed of 1300 kN·m,and torque of 8-12 mm/min.