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Mechanical response of surrounding rock of tunnels constructed with the TBM and drill-blasting method

机译：隧道掘进机与钻爆法施工隧道围岩的力学响应

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摘要

There are two kinds of excavation methods in underground engineering: the tunnel boring machine (TBM) and the drill-blasting method. A large number of studies have shown that the deformation and failure, the degree of disturbance, the stability and the reinforcement measures of surrounding rock using the TBM and drill-blasting method vary from each other. To accurately master these macroscopic damages, it is necessary to focus on the investigation of the micro-mechanical responses of the surrounding rock. Scanning electron microscopy tests, acoustic emission tests and tunnel acoustic detection tests were carried out to analyze the mechanical response of surrounding rock of tunnels, which were excavated in marble by, respectively, the TBM and the drill-blasting method. The tests results showed that most of the rock fractures cut by TBM is wipe along the crystal, and the failure mechanism is mainly cutting, while most of the rock fractures induced by the TBM coincide with crystal planes, its mechanism is mainly tensile. The stress-strain curves of rocks cut by the TBM method are rather flat around the peak strength, which means a strong resistance to deformation around the peak load. The response of AE for the rock cut by the TBM method appears after larger strains than the response of the rock constructed by the drill-blasting method. This suggests that the resistance to damage is higher under TBM excavation conditions. The relaxation depths of the tunnel excavated by the drill-blasting method are larger than the tunnel excavated by the TBM method. The research can provide more insight into tunnel failure mechanisms and provide a framework for reinforcement measures.
机译：地下工程的开挖方法有两种：隧道掘进机（TBM）和爆破方法。大量研究表明，采用TBM和喷砂法对围岩的变形破坏，扰动程度，稳定性和加固措施存在差异。为了准确地掌握这些宏观损伤，有必要集中精力研究围岩的微机械响应。进行了扫描电子显微镜测试，声发射测试和隧道声波检测测试，以分析隧道围岩的力学响应，这些隧道围岩分别通过TBM和喷砂法在大理石中开挖。试验结果表明，TBM切割的大部分岩石裂缝都是沿晶体擦拭，破坏机理主要是切割，而TBM诱导的大多数岩石裂缝与晶面相吻合，其机理主要是拉伸。通过TBM方法切割的岩石的应力-应变曲线在峰值强度附近相当平坦，这意味着在峰值载荷附近具有较强的抗变形能力。与通过钻孔喷砂法构造的岩石的响应相比，在更大的应变之后，出现了由TBM方法切割的岩石的AE响应。这表明在TBM开挖条件下，其抗破坏性更高。钻爆法开挖的隧道的松弛深度大于TBM法开挖的隧道的松弛深度。该研究可以提供有关隧道破坏机制的更多信息，并提供加固措施的框架。

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