Assessment of the annular space in a horizontal directional drilling installation.

摘要

The objective of this research is to view, analyze and assess the integrity of the annular space and develop an understanding into how it's shear strength may change through time.; The annular region, or annulus, is an area that is very seldom examined because in normal circumstances cannot be scene. Through this research, there was an opportunity to view the annulus through a Horizontal Directional Drilling (HDD) installation of six pipes in two different soil types. After installation of a pipe, cross-sections were excavated at one day, one week, two weeks, and four weeks to view and test the progression of the annulus.; It was discovered that the annulus was constantly changing in shape and extent. In addition, the properties and shear strength of the annulus is largely a factor of the native soil in which the pipes are installed. Ultimately, through all the installations and excavations, the annulus seemed to provide the necessary support to the pipe and not endanger it in any matter.