\n

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

A-Misrepresentations

C-Jacked Pipe Failure

E-PI Litigation Support

F-Geotech Assessment

G-Microtunneling Hard/Soft

H-Machine Failure

I-Boulders-Tunnel Boring

J-Boulders-Microtunneling

K-Plowing Utilities

L-Rock Socket Overrun

M-Bored Tunnel Inflow

N-Rock Comminution

O-Sub-Std TBM Performance

P-Bored Tunnel-Shear Zone

Q-Disputes Resolution

R-Problem Proj. Completion

S-Bored Tunnel Overbreak

T-Auger Sampling Problems

U-Bored Tunnel Delay

V-Hoe Ram - Failure to Rely

Peter J. Tarkoy

differing, site, conditions, overbreak, bored, tunnel, consulting

Overbreak in TBM Tunnel

--- on behalf of Contractor ---

A tunnel in Milwaukee experienced unusual and excessive overbreak, including the invert even though the rock was cut by a tunnel boring machine.

Although the contractor required only two shifts for the learning curve, their excavation performance was far below expectations.

Anticiapted / Encountered geology, encountered overbreak, and encoutnered TBM performance was presented on a single graphical page as follows:

OUTCOME: Owner settled with Contractor