Kevin M. O

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Kevin M. OConnor, P.E., Ph.D.
www.geotdr.com
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Real Time Monitoring of Subsidence along
I-70Washington, PAKevin M. O'Connor GeoTDR
Subsidiary Geotechnical Consultants, Inc
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Dec 1999
Mar 2000
I-70
Mar 2000
Oct 2000
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Monitor subsurface movement using TDR
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TDR
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Mining Panel 4 South
Mining Panel 3 South
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Monitor surface movement using tiltmeters and GPS
survey
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Transient
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Residual
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radius of influence
outside draw angle
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Outside angle of draw
Outside angle of draw
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AUTOMATED MONITORING

• Real time, automated monitoring versus periodic
  manual monitoring
• Call back alarm

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Residual sag
Residual sag
Compression bumps
Highway Damage
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Residual sag curvature
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Compressive curvature and bumps
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www.geotdr.com