An essential characteristic of this stretch is that it has been built under the water table by excavating in very heterogeneous soils, composed of granular soils and rocks of considerable resistance which has created numerous problems during the construction ...

Specific correlations developed to predict the Rate of Advance for open TBMs, double-shields and single-shields, using the RME index are presented.

Recording drilling parameters is a useful and economical technique for acquiring geomechanical information of rock mass parameters. Although it is not usually emplyed at geotechnical boreholes it is systematically used in TBM. This paper shows the obtained ...

<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 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 ...