A research program was undertaken to investigate the behavior of high-density polyethylene pipe during surface installation by horizontal directional drilling. In the fall of 1997, an instrumented high-density polyethylene pipe [55 m (180 ft) long, 200 mm (8 in.) in diameter, and dimension ratio of 17] was installed and monitored. Approximately 2 years later, three test pit excavations were completed to obtain in situ infor- mation along the bore, including pipe subsurface profile, characterization of site soils and bore slurry surrounding the pipe, location of the pipe in the bore, and pipe rotation and ovality.
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