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  Paper Details                 Browse papers by sector
Management of Heave and Subsidence Risk
Author            :Mathew Francis, PE, James Kwong, PhD, PE, Kristi K
Designation    :Co Authors
Company        :NASTT
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Synopsis
Horizontal directional drilling (HDD) in urban environments creates significant risk with respect to heave and subsidence induced damage to nearby utilities, pavements, and structures. Risk management practices and field quality controls are discussed, including trained observations, surface settlement monitoring, monitoring of drill fluid pressure and other equipment parameters.
Evaluation of heave risk factors ring during design is also discussed, based upon geotechnical conditions governing allowable drilling pressures. An application of geomechanical modeling is introduced, using cavity expansion theory to provide quantitative assessment of drilling mud limit pressure and minimum cover requirements. Analytical results are compared with other related published numerical analyses and methods.Findings are discussed in relation to five major HDD installations in the Honolulu vicinity. A summary of best practices is provided for design and installation of medium to high-risk HDD projects.
Keywords: horizontal directional drilling (HDD), risk management, quality control, subsurface utilities, geotechnics, limit pressure, cavity expansion theory, geomechanical modeling.

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