<p>This document aims to offer a guide to the methods for tunnel face stability assessment in mechanized tunnelling and to provide a best practice guideline for face support pressure calculations. Furthermore, the document intends to help with the choice between ...

<p>An optimization model was developed to obtain the ideal values of the primary support parameters of tunnels, which are wide-ranging in high-speed railway design codes when the surrounding rocks are at the III, IV, and V levels. First, several sets of experiments ...

<p>Stability and potential failure mode of tunnels and underground rock caverns are directly related to the magnitude and orientation of the in-situ rock stress. In some cases, the high horizontal in-situ stress is essential in maintaining cavern stability, ...

<p>With widespread increasing applications of mechanized tunneling in almost all ground conditions, prediction of tunnel boring machine (TBM) performance is required for time planning, cost control and choice of excavation method in order to make tunneling ...

<p>This paper shows the results of the analysis of the data acquired during the excavation of the new &ldquo;Fabriano&rdquo; Tunnel along the railway line from Rome to Ancona in Italy. The comparison between the results of the analyses and the consolidation ...

<p>Flysch formations are generally characterised by evident heterogeneity in the presence of low strength and tectonically disturbed structures. The complexity of these geological materials demands a more specialized geoengineering characterisation. <br />In ...

<p>Increasing demand on infrastructures increases attention to shallow soft ground tunneling methods in urbanized areas. Especially in metro tunnel excavations, due to their large diameters, it is important to control the surface settlements observed before ...

<p>Generally, two-pass lining systems are used for transportation tunnels constructed using the New Austrian Tunneling Method (NATM). The initial lining can support a significant portion of the long-term ground loads and thus reduce the design loads on the ...

<p>The most challenging rock mass conditions in hard rock subsea tunnels are represented bymajor faults/weakness zones. Poor stability weakness zones with large water inflow can be particularly problematic. At the pre-construction investigation stage, geological ...

<p>This paper aims to summarize all the main criteria to carry out the design and supervision of in situ concrete lining. It is shown what are the main points to make it easier the supervision. Once excavation, support and waterproofing phases are finished, ...

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