<p>With the urban population increasing, conurbation is getting more and more crowed, traffic jam happens everywhere. In this case, utilization of the underground space has become an effective way to undertake this set of problems. Tunnel construction is one ...

<p>In tunneling, it is very important to select the correct tunneling machines. Choosing a wrong method may be very costly to the company. There are many parameters affecting the decision stage of selection of the tunneling machine. Geology ...

<p>A case study associated with shield-machine bored tunnels in sand is presented in this paper. Observations show that driving the first bored tunnel resulted in up to 10 mm of surface settlement, and the ground between two tunnels seems to have been affected ...

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 ...

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 ...

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>The following article discusses the relevant material characteristics of GFRP and their influences on the design and construction of alternative TBM breakthroughs and shows possible solutions for the mentioned situation.</p>