http://worldcat.org/entity/work/id/1863897010

Feasibility of horizontal boring for site investigation in soil : final report : prepared for Federal Highway Administration, Offices of Research and Developmen

The objective of this study is to assess horizontal boring and exploration as an alternative to vertical boring in geotechnical investigation prior to the design and construction of tunnels. The study was divided into three separate topics: Excavation, Exploration, and Economics. Under Excavation, new ideas and preliminary designs were developed for continuous, maneuverable penetration out to distances of 5000 ft (1500 m). Detailed methodology is presented for penetration to 2000 to 3000 ft (610 to 915 m) with recently developed equipment and technology. Under Exploration, preliminary designs were developed for down-hole seismic (geophysical) and contact sensing. These approaches were technically evaluated by investigation of wave attenuation characteristics and hole disturbance. Under Economics, horizontal penetration (with on-board sensing and separate follower sensing) was compared for cost effectiveness with vertical boring and surface geophysics. In addition, the cost of unanticipated conditions was summarized from case histories to assess the value of the various exploration approaches.

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