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Principles & Practices of Tunnel Boring - 08-18-25 - Rebroadcast
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Principles & Practices of Tunnel Boring
Date: 8/18/2025
Time: 3:00 PM - 4:00 PM EST
Credit: 1 hour
There are several types of “TBMs” – Tunneling Boring Machines. The best TBM for a project is based on the geological conditions of the site and the project’s features. There are general classifications of the different types of TBMs for both hard rock and soft ground.
Tunnel boring machines (TBMs) have extreme rates of tunneling of 15 km/year and 15 m/year and sometimes even less. The expectation of fast tunneling places great responsibility on those evaluating geology and hydrogeology along a planned tunnel route. When rock conditions are reasonably good, a TBM may be two to four times faster than the drill and blast method. The problem lies in the extremes of rock mass quality, which can be both too bad and too good (no joints), where alternatives to TBM may be faster. The basic advantages of TBMs are high safety with low over breaks, little disturbance to surrounding rock mass, and low manpower. However, set-up and dismantling time are significant and the range of available tunnel cross-section shapes is limited. Engineers should not use TBMs where engineering geological investigations have not been done in detail and rock masses are very heterogeneous. Contractors can design TBMs according to the given rock mass conditions, which are nearly homogeneous.
This Webinar will address the- Principals’ & Practices of Tunnel Boring
Field of Study: Geotechnical
Level: Basic
Presenter:
Ronald Finger
Prerequisites:
None
Date: 8/18/2025
Time: 3:00 PM - 4:00 PM EST
Credit: 1 hour
There are several types of “TBMs” – Tunneling Boring Machines. The best TBM for a project is based on the geological conditions of the site and the project’s features. There are general classifications of the different types of TBMs for both hard rock and soft ground.
Tunnel boring machines (TBMs) have extreme rates of tunneling of 15 km/year and 15 m/year and sometimes even less. The expectation of fast tunneling places great responsibility on those evaluating geology and hydrogeology along a planned tunnel route. When rock conditions are reasonably good, a TBM may be two to four times faster than the drill and blast method. The problem lies in the extremes of rock mass quality, which can be both too bad and too good (no joints), where alternatives to TBM may be faster. The basic advantages of TBMs are high safety with low over breaks, little disturbance to surrounding rock mass, and low manpower. However, set-up and dismantling time are significant and the range of available tunnel cross-section shapes is limited. Engineers should not use TBMs where engineering geological investigations have not been done in detail and rock masses are very heterogeneous. Contractors can design TBMs according to the given rock mass conditions, which are nearly homogeneous.
This Webinar will address the- Principals’ & Practices of Tunnel Boring
Field of Study: Geotechnical
Level: Basic
Presenter:
Ronald Finger
Prerequisites:
None
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