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dc.contributor.authorXia, Hongweien
dc.date2009-01-14 12:23:35.069
dc.date.accessioned2009-01-14T20:53:58Z
dc.date.available2009-01-14T20:53:58Z
dc.date.issued2009-01-14T20:53:58Z
dc.identifier.urihttp://hdl.handle.net/1974/1659
dc.descriptionThesis (Ph.D, Civil Engineering) -- Queen's University, 2009-01-14 12:23:35.069en
dc.description.abstractHorizontal Directional Drilling (HDD) has been used internationally for the trenchless installation of utility conduits and other infrastructure. However, the mud loss problem caused by excessive mud pressure in the borehole is still a challenge encountered by trenchless designers and contractors, especially when the drilling crosses through cohesionless material. Investigation of mud loss problem is necessary to apply HDD with greater confidence for installation of pipes and other infrastructure. The main objectives of this research have been to investigate the maximum allowable mud pressure to prevent mud loss through finite element analysis and small scale and large scale laboratory experiments. The recent laboratory experiments on mud loss within sand are reported. Comparisons indicate that the finite element method provides an effective estimation of maximum mud pressure, and “state-of-the-art” design practice- the “Delft solution” overestimates the maximum mud pressure by more than 100%. The surface displacements exhibit a “bell” shape with the maximum surface displacement located around the center of the borehole based on the data interpreted using Particle Image Velocimetry (Geo-PIV) program. A parametric study is carried out to investigate the effect of various parameters such as the coefficient of lateral earth pressure at rest K0 on the maximum allowable mud pressure within sand. An approximate equation is developed to facilitate design estimates of the maximum allowable mud pressure within sand. A new approach is introduced to consider the effects of coefficient of lateral earth pressure at rest K0 on the blowout solution within clay. The evaluations using finite element method indicate that the new approach provides a better estimation of the maximum allowable mud pressure than the “Delft solution” in clay when initial ground stress state is anisotropic (K0 ≠1). Conclusion of this research and suggestions on future investigation are provided.en
dc.format.extent10085823 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectMaximum Mud Pressureen
dc.subjectMud Lossen
dc.subjectDirectional Drillingen
dc.subjectGround Heaveen
dc.titleInvestigation of Maximum Mud Pressure within Sand and Clay during Horizontal Directional Drillingen
dc.typethesisen
dc.description.degreePhDen
dc.contributor.supervisorMoore, Ian D.en
dc.contributor.departmentCivil Engineeringen
dc.degree.grantorQueen's University at Kingstonen


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