The paper presents a decision making process for the determination of the numerous grouting parameters during design and the necessary corrective and evaluation actions during field trials or systematic grouting. Special application of design and execution ...

<p>Packer test data and tunnel inflow observations are used to show that the distribution of equivalent hydraulic conductivity obtained for a rock mass from borehole packer testing will be biased if the orientations of the planned tunnel and testing borehole ...

Groundwater inflows into tunnels constructed in fractured bedrocks not only constitute an important factor controlling the rate of advancement in driving the tunnel but may pose potential hazards. Drawdowns caused by tunnel construction may also induce geotechnical ...

The Swiss Alptransit System (also called NEAT) is an important element of the new European high speed railway network . This system, which is currently under construction, consists of two railway axes - the Gotthard and Lštschberg Axes - which will pass through ...

<p>Principal geotechnical difficulties likely to be encountered when driving a tunnel through a fault zone are: instability of the face; excessive overbreak and deformation from squeezing and/or swelling fault rocks; instability of intermediate construction ...