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GeoConSol
Geotechnical & Tunnel Consultants

A consultant is a universal observer who can look at a problem outside the environment in which the problem came to be, thereby creating a solution that was never possible before.  Fernando Flores

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EXPERT / FORENSIC SERVICES
DIFFERING SITE CONDITIONS
-->DSC Technical Principles
-->DSC Standards for Entitlement
-->DSC Independent Review
-->DSC Case Histories
-->Case History of a Bogus Expert
GEOTECHNICAL / CONSTRUCTION
-->Rock Testing/Boreability
-->Impact Hammer Feasibility
ARTICLES / PUBLICATIONS
TUNNELS / TUNNELING
-->Tunnel Boring
-->Excavation Improvement
-->Microtunneling/Pipe-Jacking
-->Selection of TBMs & MTBMs
-->Forensic Investigations
-->Safety
-->Detection of Covert Tunnels
CLIENTS
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Peter J. Tarkoy

Tunnel Boring & Microtunneling
Machine Selection

  • Should you select the machine with: 

    • total availability of machine parameters & operating variables

    • legendary service & responsive machine manufacturer

    • consistent high penetration rates 

    • consistent record breaking excavation advance rates

    • historical record of negligible learning curves

    • worldwide network of parts warehouses

     

  • Should you select the machine / manufacturer with: 

    • lowest price (often underpowered)

    • historical record of commissioning problems 

    • manufacturer consistently denying responsibility

    • offsite control of machine operational forces & penetration limits 

    • consistent performance below predictions

    • low productivity over-running schedule voiding great buyback "deal" 

    • threats of support withdrawal upon challenge 

    • a company who will not stand by lease offers and forces purchase

    • a large, aggressive, and righteous "terrorist" legal stable & owned by banks

     

  • The costs for machine caused delays on labor can be large 

A cheap TBM above ground =costliest TBM underground!

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