长距离极硬岩隧道盾构掘进刀盘适应性研究

Research on Key Technology of Shield Tunneling for Long Distance Extremely Hard Rock Tunnel

通过简化的CSM法向荷载力学模型,建立盘形滚刀破岩磨损理论计算模型,分析滚刀与硬岩之间的动态摩擦过程,提出基于塑性去除机制的微切削及微犁沟磨粒磨损是滚刀最主要的直接磨损形式。针对深圳地铁12号线区间长距离极硬岩工程地质,结合盾构法施工特点,对比分析适用于硬岩施工的盾构机及刀盘选型,归纳总结刀具磨损失效形式,提出了硬岩刀具磨损监测及控制措施,提出了一种多因素控制的刀盘优化配置措施及建议。研究表明,结果与滚刀磨损情况比较相吻合,对判断滚刀损坏具有可行性和参考性,在盾构施工中通过对刀具进行有效保护,可减少换刀频率、减少停机时间、提高掘进效率、降低工程成本,对相应工程施工指导具有一定的意义。

Through the simplified CSM normal load mechanical model,the theoretical calculation model of rock breaking wear of disc hob is established,and the dynamic friction process between the hob and hard rock is analyzed.It is proposed that micro cutting and micro furrow abrasive wear based on plastic removal mechanism are the main direct wear forms of hob.In view of the engineering geology of long-distance extremely hard rock in the section of Shenzhen Metro Line 12,combined with the construction characteristics of the shield method,the selection of shield machines and cutter heads suitable for hard rock construction is compared and analyzed,the failure forms of cutter wear are summarized,the monitoring and control measures for cutter wear in hard rock are proposed,and a multi factor control cutter head optimization configuration measure and suggestions are proposed.The research shows that the results are consistent with the wear condition of the hob,which is feasible and referential for judging the damage of the hob.By effectively protecting the cutter during the shield construction,the frequency of tool change can be reduced,the downtime can be reduced,the tunneling efficiency can be improved,and the project cost can be reduced,which has certain significance for the guidance of the corresponding project construction.