Modelling 
Using basic borehole and geotechnical information, our approach to data analysis and modelling will rapidly provide a profile of expected advance rates along the entire length of the tunnel.

Uncertainties in geology and geotechnical properties, machine parameters and operational factors are comprehensively modelled using probabilistic simulation tools. 

At the core of these models are well-established methods for estimating machine advance or cutting rates, which have been  converted into probabilistic form and combined with our own procedures for predicting ground conditions.

The impacts of geotechnical factors that influence machine utilisation or availability, such as the need to install ground support, carry out grouting or change cutting tools, can all be included in the model.

Interpretation
Our clear graphical data presentation will show you the sensitivity of your selected or prospective excavation system to variations in ground conditions, enabling you to programme and resource your project effectively.  The probability of achieving your target advance rate can be read directly from the output charts we provide, and used in your commercial risk analysis.

You can compare the likely performance of alternative excavation systems before getting on site, and use this as an aid to method selection.  Similarly, you can assess the effects of changing specific machine parameters or operational factors, and use a 'what-if' approach to find the optimum combination of excavation machine and back-up equipment.

Reliable estimates of muck production rates can be used to assess the adequacy of your proposed muck removal system, and ensure this does not unintentionally become a rate-limiting factor.

Unforeseen Conditions