<p>The tunnel may have to be constructed across a faulted zone as it is not always possible to avoid crossing active faults. In these situations, the tunnel must tolerate the expected fault displacements and seismic action, and allow<br />only minor damages ...

In tunnel construction, overcut along with undercut estimation is one of the most important factors to be considered before proceeding to the next operation. It is currently analyzed based on sparsely sampled points surveyed using a total station, but not ...

<p>This article describes briefly the main assessments on the approaches used by engineers in quantifying the seismic effect on an underground structure, both referring to deterministic either probabilistic methods. However, the main purpose is that of proposing ...

<p>A model for probabilistic assessment of excavation performance of tunnel projects is presented. The model is based on Dynamic Bayesian Networks (DBN) and enables to consider the quality of the design and construction process. It is applied on a case study, ...

<p>This paper describes the role of the Geotechnical Engineering Office, Civil Engineering and Development Department of the HongKong Special Administration Region (HKSAR) Government in exercising geotechnical control for a major railway project in HongKong. ...

This paper discusses some of the problems encountered with water ingress on the 72km of tunnels on this project. Grouting is always a significant portion of dam projects and with the quantities of water expected in the tunnels, was also going to be an important ...

<p>The paper describes the selected significant developments, with the emphasis on the following findings: Charts are presented for more accurate determination, of the five input parameters of the RME, using graphical representation. New expressions to evaluate ...

The tunnels have been constructed following the NAT method, without top heading and benching, and therefore full face excavated with a total section of 80 m2, and tunnel pulls ranging from 2 to 4 m. The south section of both tubes, excavated in coluvial soils, ...

The inspection of the waste chips has consisted not only in the weight in the belt but also in the size and shape of the waste. Finally, the drilling parameters controlled were: - rate of advance - time of excavation - weight of material in the belt - thrust ...

Over 500 case histories were analysed in two years to bring the Rock Mass Excavability (RME) index to fruition and demonstrate its effectiveness on five current projects. It should be emphasised that the RME index does not replace the RMR or Q systems as used ...