Geotechnical and Trenchless Engineering     





Receiving the microtunnel boring machine on line and grade after boring 440 feet through Bay Mud in Martinez, California.














Close-up of the face of a microtunnel boring machine.














Slurry separation plant used to process the spoils from a microtunnel pipe jacking project.














Jet grouting along a set of railroad tracks in support of a MTBM project in Martinez, California.














Fusion of the bursting head to a 21-inch diameter pipeline in Santa Cruz, California.














Preparing a maxi-HDD drill rig for a river crossing project in Santa Clara, California.














Installing fiber optic conduits in front of the convention center in Santa Clara, California.















© 2012 DCM Consulting, Inc.

Technical Publications



Dave has authored or co-authored over 20 technical papers which have been published in academic journals and presented at various engineering conferences within the United States and abroad. A list of these papers is presented below. If you would like to receive a copy of any of these papers, please contact DCM Consulting, Inc.

Microtunneling

Guided Boring and the Lafayette/Pleasant Hill Road Trunk Sewer
By: D. Mathy, R. Lanzafame, W. Adams and S. Gallyer
Presented at:   NASTT 2012, North American No-Dig Conference and Exhibition, Nashville, Tennessee

Managing Geotechnical Risks on Trenchless Projects
By: D. Mathy and M. Gelinas
Presented at:   NASTT 2010, North American No-Dig Conference and Exhibition, Chicago, Illinois

Differing Site Condition Claims and Trenchless Projects
By: D. Mathy and M. Gelinas
Joseph Covello (The Covello Group)
Presented at:   NASTT 2008, North American No-Dig Conference and Exhibition, Dallas, Texas

Microtunneling Beneath the Napa River
By: R. Kahl and D. Mathy
Tim Healy (Napa Sanitation District)
Ted Whiton (Winzler & Kelly)
Presented at:   NASTT 2007, North American No-Dig Conference and Exhibition, San Diego, California

Microtunneling Construction Challenges on the Alvarado Boulevard Trunk Sewer Project
By: D. Mathy
R. Arbolante (Union Sanitary District)
Presented at:   NASTT 2005, North American No-Dig Conference & Exhibition, Orlando, Florida

Microtunneling in Challenging Soil Conditions: The Alvarado Boulevard Trunk Sewer Project
By: K. Calderwood, J. Gill and D. Mathy
Presented at:   NASTT 2004, North American No-Dig Conference & Exhibition, New Orleans, Louisiana

TBM vs. MTBM: Geotechnical Considerations
By: D. Mathy and R. Kahl
Presented at:   ASCE 2003, International Conference on Pipeline Engineering and Construction, Baltimore, Maryland
NASTT 2003, International No-Dig Conference and Exhibition, Las Vegas, Nevada

Engineering Inspection of Microtunnel Pipe Jacking
By: D. Mathy
Presented at:   NASTT 2001, North American No-Dig Conference and Exhibition, Nashville, Tennessee
CWEA 2000, Sacramento, California

Geologic Research and Reconnaissance: Stepping Stones through Stumbling Blocks in Trenchless Projects
By: D. Nielson, D. Mathy and M. Gelinas
Presented at:   2000 Annual Meeting of the Association of Engineering Geologists and the Groundwater Resources Association, Santa Clara, California.

Martinez East Side Trunk Sewer Microtunneling Through Bay Mud Directional Drilling Through Bedrock
By: D. Mathy and D. Nielson
Kent VonAspern (Central Contra Costa Sanitary District)
Presented at:   1999 Rapid Excavation and Tunneling Conference, Orlando, California
P.U.G. 2000, Berkeley, California

Geotechnical Engineering Aspects of Microtunneling in Soft Ground
By: D. Mathy, R. Kahl, and D. Nielson
Presented at:   Geo-Institute Conference 1999
Geo-Engineering for Underground Facilities University of Illinois at Urbana-Champaign

Geologic Reconnaissance: The First Step in Successful Trenchless Construction
By: D. Mathy and D. Nielson
Presented at:   NASTT 1999, North American No-Dig Conference and Exhibition, Orlando, Florida

A Tale of Two Tunnels
By: T. Pilecki (Central Contra Costa Sanitary District)
K. VonAspern (Central Contra Costa Sanitary District)
D. Mathy
Presented at:   NASTT 1999, North American No-Dig Conference and Exhibition, Orlando, Florida

South Orinda Sewer Improvements, The Unbuildable Project
By: T. Pilecki (Central Contra Costa Sanitary District)
M. Penny (Central Contra Costa Sanitary District)
D. Mathy
Presented at:   P.U.G. 1999, Oakland, California

The Influence of Geologic Setting on Microtunneling
By: D. Mathy and D. Nielson
Presented at:   ASCE 1998, Pipelines in the Constructed Environment, San Diego, California

Recipe for Successful Microtunneling
By: J. Goodwin (Brown and Caldwell)
J. Gill (Union Sanitary District)
D. Mathy
Presented at:   CWEA 1998, Oakland, California
ASCE 1998, San Diego, California
P.U.G. 1998, Berkeley, California

Planning and Design Considerations for Microtunneling
By: D. Mathy
T. Pilecki (Central Contra Costa Sanitary District)
Presented at:   NASTT 1997, North American No-Dig Conference and Exhibition, Seattle, Washington
P.U.G. 1997, Oakland, California


EPBM (Earth Pressure Boring Machine) Tunneling

Tunneling the A-Line
By: D. Nielson, D. Mathy, T. Kalkman and D. Bennett
Presented at:   NASTT 2009, International No-Dig Conference & Exhibition, Toronto, Canada


Horizontal Directional Drilling

Designing and Interpreting Geotechnical Investigations for Horizontal Directional Drilling
By: M. Gelinas and D. Mathy
Presented at:   ASCE 2004, International Conference on Pipeline Engineering and Construction, San Diego, California

Horizontal Directional Drilling: Lessons Learned in Telecommunications Conduit Installations
By: M. Gelinas and D. Mathy
Presented at:   U.I.R. 2001, International Conference on Underground Infrastructure Research, Kitchner, Ontario, Canada
NASTT 2001, North American No-Dig Conference and Exhibition, Nashville, Tennessee
P.U.G. 2001, Berkeley, California


Wastewater Treatment Facilities

Design and Construction of the Ryder Street Storage Basin
By: M. Gelinas and D. Mathy
M. Larson and R. Hoffman (Carollo Engineers)
R. Ohlemutz and R. Matheson (Vallejo Sanitary and Flood Control District)
Presented at:   P.U.G. 2007, Berkeley, California