NAT 2022

The North American Tunneling Conference is the premier biennial tunneling event for North America. This four-day conference provides access to a technical program focused on the current tunneling projects, challenges and successes throughout North America.

Connect with us at exhibit booths 813 and 815.

The event is finished.

Hourly Schedule

June 20th

1:30 p.m. -
Design of Underground Spaces
Speakers:
Paul Hetu
2:00 p.m. - 2:25 p.m.
Flow Control in Tunnels
Most fatalities in tunnel fire events have been caused by the spread of toxic smoke. The control of smoke spread is crucial to providing a survivable environment for egress. A properly designed and tuned feedback control loop is required to achieve a target flow which is slow enough to allow for escape of people under different boundary conditions. It is also helpful in optimizing energy consumption under moving traffic conditions. A reliable feedback flow control system requires sophisticated engineering know-how and experience, careful selection of instruments and controlled variables, and a thoughtful implementation from design through field testing and commissioning.
Speakers:
Darold Woodward, Petr Pospisil
2:50 p.m. - 3:15 p.m.
Freight Trains in Tunnels
Several issues associated with operating freight trains in tunnels are of high importance during the planning and operation phases. During uphill operation, high air temperatures at air intake locations of diesel trains might reduce diesel motor efficiency (choking). In a fire scenario, ventilation can exacerbate the firefighting efforts due to fanning or water-reactive cargo materials and their chemical reactions with water. The paper focuses on air quality in diesel train-operated tunnels, the impact of freight trains on the tunnel safety concept, and on strategies to overcome heat issues at locomotives air inlets.
Speakers:
Bernd Hagenah, Danielle Johnson, Dejan Matic, Eric Jones, Petr Pospisil, Sean Cassady

June 21st

8:30 a.m. -
Planning: Underground Project Risk
Speakers:
Mike Wongkaew
2:25 p.m. - 2:50 p.m.
Trenchless Utility Relocation Addresses Environmental Impact for Channel Crossing
Value Engineering on Connecticut DOT’s Walk Bridge selected the trenchless option for utility relocation to address the channel crossing’s environmental concerns. The design and construction considerations of the twin micro-tunnel drives, and associated shafts are presented. Key challenges included vertical alignment selection to achieve minimum one-tunnel diameter stable cover within thin glacial till underlying extremely soft clay, limited choice of pipe and joint materials meeting stringent non-metallic conduit requirements, thermal grout backfill application, and the close proximity of temporary trestle piles. Mitigation measures were developed for potential point loading pipe damage from remnant boulder fragments in the annular space.
Speakers:
Christian Brown, Eric Wang
2:25p.m. - 2:50 p.m.
Applications of Artificial Intelligence in Tunnel Design and Construction
Recently, there has been enormous increase of interest in artificial intelligence and associated machine learning applications by researchers, government agencies, and the underground construction industry. These tools have been heralded and their potential used to automate the design and construction processes and boost productivity, safety, quality, and operational stability. This paper presents applications of artificial neural networks (ANNs) in ground characterization, ground support prediction, risk projection and reduction, and productivity enhancement in the realm of TBM operations. The paper further investigates ANN use in fusion of gathered information to automate TBM operations and reduce risks of tunneling to overlying structures.
Speakers:
Kumar Bhattarai
2:50 p.m. - 3:15 p.m.
Planning for Emerging Technology Underground Connection Between Rancho Cucamonga Metrolink Station and Ontario International Airport
Rail access to Ontario International Airport (ONT) has long been a goal of San Bernardino County Transportation Authority (SBCTA) to increase public transit options to ONT and provide incoming ONT passengers more access to San Bernardino County and the greater Southern California region. This paper describes the planning for the Design-Build-Operate-Maintain (DBOM) delivery of an emerging technology tunnel connection between the Rancho Cucamonga Metrolink station and ONT. The paper discusses key technical considerations, challenges, and opportunities; conceptual configuration development; and construction planning and establishment of the footprint for the underground connection.
Speakers:
Brandon Kluzniak, Mike Wongkaew, Per Vilhelmsson

June 22

9:00 a.m. - 9:25 a.m.
Lateral Rock Load Estimation for Cut and Cover Structures
A method for estimating geotechnical rock loads in shallow cut and cover subway stations is presented. Localized geotechnical conditions lead to extreme variation of potential rock loadings within the excavation depth on retaining walls for structures. Actual lateral rock stress on these structures can range from zero to over four times the vertical in-situ rock stress. Primary factors affecting the actual lateral stress include intact and rock mass mechanical properties, excavation sequence, localized tectonic conditions, and potential future adjacent structures. The recommended approach applies Terzaghi’s method during concept design, followed by UDEC modelling and stress measurement during final design.
Speakers:
Charles Stone, Eric Wang
Paul Hetu
Senior Project Manager
Darold Woodward
Department Manager - Engineering
Petr Pospisil
Technical Advisor
Bernd Hagenah
Practice Consultant
Danielle Johnson
Engineer
Dejan Matic
Project Engineer
Eric Jones
Senior Project Engineer
Sean Cassady
Senior Technical Advisor
Mike Wongkaew
Practice Consultant
Christian Brown
Senior Project Manager
Eric Wang
Senior Technical Advisor
Kumar Bhattarai
Senior Technical Advisor
Brandon Kluzniak
Senior Project Manager
Per Vilhelmsson
Senior Resident Engineer
Charles Stone
Technical Advisor

Date

Jun 19 - 22 2022
Expired!

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Location

Philadelphia, PA
Category

Organizer

North American Tunneling Conference
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Speakers