With a better understanding of the factorsassociated with directionally drilled installations, contractors and engineers may better select tooling andtechniques to minimize the magnitude and extent of surface heave.1. Results from thisexperiment are utilized in the development of a model to further understand how these factors relate toeach other in the propagation of surface displacements. Using the ranking identified by the AHP,a full factorial experiment was designed and implemented under actual field conditions with groundmovements measured at various stages along four uniquely designed borepaths. Initial identification and selection of factors to be utilized in the model were facilitated using apanel of experts and the Analytical Hierarchy Procedure (AHP). This paper outlines the development of a model to understand how the aforementionedfactors contribute to surface heave during the back ream phase of a horizontal directionally drilledinstallation. With any complex system, understanding how these factorsrelate to each other in the development of surface deformations is beneficial in the planning of futureinstallations. The magnitude and extent of surface deformations are influenced by severalfactors including borehole pressure, depth of cover, soil density, back ream rate, soil composition,annular space, reamer type and diameter. Webb School of Construction, Arizona State University, Tempe, Arizona USAABSTRACT: As the utilization of horizontal directional drilling increases in urban areas, damage resultingfrom surface heave during pullback is becoming a greater concern for municipalities, regulatory agenciesand contractors alike. BA Terraco Excavating Limited, Calgary, Alberta, CanadaB Del E. Congrès annuel de la Société canadienne de génie civilAnnual Conference of the Canadian Society for Civil EngineeringMontréal, Québec, Canada5-8 juin 2002 / June 5-8, 2002MODELLING OF SURFACE HEAVE CONTRIBUTING FACTORS INDIRECTIONAL BORING OPERATIONSJason S.
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