Session Start Date

6-1-1988

Abstract

The U.S. Bureau of Mines recently demonstrated the accurate directional drilling of a near-horizontal borehole with the objective of intercepting a designated target. The project was conducted at the Navajo Dam for the Bureau of Reclamation, U.S. Department of the Interior. The Bureau of Reclamation's objective was to determine the feasibility of accurately drilling long near-horizontal boreholes, from the surface, in lieu of constructing a tunnel under an embankment dam from which shorter boreholes would be accurately drilled to control water seepage. As a result of the demonstrated drilling accuracy, the Bureau of Reclamation can consider the option of using near horizontal boreholes drilled from the surface at a cost of $100-200/ft instead of constructing access tunnels at $2,000/ft from which drainage boreholes would be drilled to control water seepage at embankment dams.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1988

Document Version

Final Version

Rights

© 1988 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

Demonstrating Borehole Drilling Accuracy at the Navajo Dam

The U.S. Bureau of Mines recently demonstrated the accurate directional drilling of a near-horizontal borehole with the objective of intercepting a designated target. The project was conducted at the Navajo Dam for the Bureau of Reclamation, U.S. Department of the Interior. The Bureau of Reclamation's objective was to determine the feasibility of accurately drilling long near-horizontal boreholes, from the surface, in lieu of constructing a tunnel under an embankment dam from which shorter boreholes would be accurately drilled to control water seepage. As a result of the demonstrated drilling accuracy, the Bureau of Reclamation can consider the option of using near horizontal boreholes drilled from the surface at a cost of $100-200/ft instead of constructing access tunnels at $2,000/ft from which drainage boreholes would be drilled to control water seepage at embankment dams.