Filling material is present around the segment lining when a shielded Tunnel Boring Machine is used to excavate a tunnel. The two-component grout is becoming lately one of the most used filling materials. Its mechanical properties evolve over time. Unfortunately, there are not many studies in the literature on the specific mechanical characteristics of these materials. This work presents the results obtained from an extensive laboratory test campaign that allowed to fully characterize the two-component filling material during the setting period. In particular, the values of the stiffness and resistance parameters were obtained over time, where uniaxial compression tests and oedometer tests were carried out. A detailed study of the effect of the presence of the filling material on the behavior of the support system (segmental lining + filling material) was developed for two of the most widespread analytical methods for the analysis of the behavior of tunnels and structures of support: the convergence-confinement method and the Einstein and Schwartz method. Subsequent parametric analyses made it possible to consider the variability of the influencing parameters within the typical variability ranges obtained from the laboratory test campaign or known from the available scientific literature. From the study carried out, it was possible to note that it is necessary to consider the presence of the filling material in the evaluation of the stiffness of the support system, when using the convergence-confinement method to estimate the loads acting on segmental lining. In this regard, it is necessary to have a reliable estimate of the elastic modulus of the filling material in the period of loading of the segmental lining. On the other hand, the presence of the ring of filling material is negligible when evaluating the state of stress of the segmental lining with specific methods capable of considering the rock-support interaction. In particular, adopting the Einstein and Schwartz method, it is possible to define the bending moments and normal forces acting in the support structure, referring to the stiffness parameters of the segmental lining alone.

当使用屏蔽的隧道掘进机开挖隧道时，在段衬砌周围存在填充材料。两组分灌浆最近成为最常用的填充材料之一。它的机械性能会随着时间而变化。不幸的是，文献中关于这些材料的特定机械特性的研究并不多。这项工作展示了从广泛的实验室测试活动中获得的结果，该测试活动使凝结期间的两组分填充材料得以充分表征。特别是，随着时间的推移获得了刚度和阻力参数的值，其中进行了单轴压缩测试和里程表测试。针对隧道和支护结构行为的两种最广泛的分析方法，详细研究了填充材料的存在对支撑系统（分段衬砌+填充材料）性能的影响：收敛约束方法和爱因斯坦与施瓦茨方法。随后的参数分析使得可以考虑从实验室测试活动或从现有科学文献中获知的典型变异范围内影响参数的变异性。从所进行的研究中，可能会注意到在评估支撑系统的刚度时有必要考虑填充材料的存在，当使用收敛约束方法来估计作用在分段衬砌上的载荷时。在这方面，需要在分段衬里的加载期间可靠地估计填充材料的弹性模量。另一方面，当使用能够考虑岩石与支撑相互作用的特定方法评估分段衬砌的应力状态时，可以忽略填充材料环的存在。特别地，采用爱因斯坦和施瓦茨方法，可以仅参考分段衬砌的刚度参数来定义作用在支撑结构中的弯矩和法向力。另一方面，当使用能够考虑岩石与支撑相互作用的特定方法评估分段衬砌的应力状态时，可以忽略填充材料环的存在。特别地，采用爱因斯坦和施瓦茨方法，可以仅参考分段衬砌的刚度参数来定义作用在支撑结构中的弯矩和法向力。另一方面，当使用能够考虑岩石与支撑相互作用的特定方法评估分段衬砌的应力状态时，可以忽略填充材料环的存在。特别地，采用爱因斯坦和施瓦茨方法，可以仅参考分段衬砌的刚度参数来定义作用在支撑结构中的弯矩和法向力。