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泥水盾构在高强度基岩地层中掘进,盾构自身刀具无法有效破岩,采用基岩爆破预处理的控制钻爆法能严格控制破碎碴块体量,提高刀具破岩能力,但盾构施工过程中,掘进参数与岩石之间关系非常复杂。以台山核电站取水隧道为背景,对现场获得的工作数据进行挖掘,分析基岩爆破前后地层中盾构刀盘推力、刀盘扭矩及掘进速度的参数的选用特点。在此基础上,引入参数转换量FPI、TPI指数及比能进行研究,研究表明,未经处理基岩地层,岩石强度过高,刀盘推力先达到最大值,但切深很浅,扭矩很难发挥最大能力;经爆破处理后,基岩岩体受到不同程度破碎,盾构机推力及扭矩能有效发挥其功能,掘进效能提高。因此,在盾构机的工作负荷范围内,应依据基岩岩体破碎效果,调整刀盘推力和扭矩,使之更好地适应地层,力争达到高效安全的掘进目的。
Slurry shield tunneling in high-strength bedrock, shield its own tool can not effectively break rock, the use of bedrock blasting control drilling and blasting method can strictly control the amount of broken ballast block, improve tool rock breaking capacity, but the shield During construction, the relationship between heading parameters and rock is very complicated. Taking the Taishan Nuclear Power Station water intake tunnel as a background, the working data obtained at the site were excavated to analyze the selection characteristics of shield cutter thrust, cutter torque and driving speed before and after bedrock blasting. On this basis, the introduction of parameter conversion FPI, TPI index and specific energy research, research shows that untreated bedrock formation, the rock strength is too high, the first cutter reached the maximum thrust, but the depth of cut is very shallow, the torque is very It is difficult to exert its maximum capacity; after blasting treatment, the bedrock rock mass is crushed to varying degrees, and the thrust and torque of the shield machine can effectively exert its function and the tunneling efficiency is improved. Therefore, within the working load range of the shield machine, the thrust and torque of the cutterhead should be adjusted according to the crushing effect of bedrock mass to make it adapt to the strata better and achieve the goal of high efficiency and safety.