<p>Measurements on back-fill grouting at Groene Hart Tunnel (GHT) are described and analysed. The research utilises TBM data, monitored grout pressures and measured rheological properties of tunnelling fluids. Grout injection strategy and vertical grout pressure ...

<p>Predicting ground conditions ahead of the tunnel face has been one of the most important requirements of tunnel construction. This study investigated the development and application of a high resolution ultrasonic wave imaging system, which captures the ...

Electrical Resistivity Tomography (ERT) profiles along the axis of both tunnels. Also several geophysical investigation methods have been applied, in order to allow a good knowledge of the rock mass. In situ geotechnical tests have been also carried out, yielding ...

<p>During the planning of the Mae Ngad-Mae Kuang project a comprehensive geological/geotechnical investigation program led to an optimization of the alignment with respect to technical and environmental risks. Different options for the construction of the ...

This paper presents the methodology used to characterise the weaker zones of Le Perthus tunnel. Two phase investigation, one with in situ and laboratory testing and second with pilot tunnel.

This paper presents the value of a good geotechnical model for underground works and how this can be achieved.

<p>To investigate traffic tunnel ventilation flows, a scaled model of a traffic tunnel with longitudinal ventilation system based on ducted fans is used. Flows in tunnels are influenced by tunnel geometry, fan characteristics, ventilation operation scenario, ...