盾构机在长距离硬岩中掘进的探讨

研究目的：盾构机目前已广泛应用于各种土建工程领域。利用盾构技术解决地铁工程中长距离硬岩掘进的工程实例不多见。本文主要研究运用盾构机在硬岩段掘进的适应能力以及在硬岩段掘进可能出现的问题和需采取的措施。研究方法：文章通过广州地铁1个长距离硬岩掘进的工程实例，收集施工过程中相关的数据、出现的问题以及所采取的对策等资料，并对这些信息进行分析。研究结果：根据该工程的施工过程得出盾构机在硬岩中的掘进是可行的，出现的问题能够通过采取相应的措施予以克服。研究结论：由于本段硬岩有极细小裂隙且裂隙多被石英细脉充填，因此盾构能够顺利掘进。可以得出结论：只要裂隙发育，即使岩石单轴抗压强度高，可以通过选用适宜的盾构机型、合理地进行刀盘和刀具配置，完全可以顺利地在硬岩中掘进，而且比其它工法掘进速度更高。

Exploration on Tunnelling by Shield Machine in Long-distance Hard Rock Area

Research purposes: At present,shield tunnelling machine has been applied widely in variable fields of civil engineering,but it is seldom found the shield tunnelling technology was applied to tunnelling in long-distance hard rock for subway construction.The research in this paper was made mainly on the adaptation of shield tunnelling machine,the problem that probably occurred and the measures that should be taken for tunnelling in long-distance hard rock.Research methods:The information was collected on the relevant data,problems and countermeasures taken in construction through the construction example of tunnelling in long-distance hard rock area of Guangzhou Metro.Also the analysis was made on these information.Research results:It was shown from the example mentioned above that the tunnelling by shield tunnelling machine in long-distance hard rock area was feasible and the problems could be solved by taking some measures.Research conclusions:Shield tunnelling machine could tunnel smoothly because the hard rock in this area had small fissures and most fissures had been filled by fine quartz vein.It could be said although the single axle of rock had good compression,if fissure developed,shield tunnelling machine could tunnel smoothly in hard rock area and the tunnelling speed was faster than that of other machines through selecting right type of shield tunnelling machine and equipping right cutter head and bit tool.