ABSTRACT
This paper presents a new technique to predict forces and deformations of pipes installed underground by the horizontal directional drilling. The new model predicts the shape of the pipe in the bore-path. Based on the pipe shape, shape of the borepath and pipe stiffness, the contact forces between the pipe and the borepath are calculated. The contact forces cause friction and thus axial pulling force is induced to overcome the frictional forces. The analytical model is used to analyse the stresses and strains on two pipes that were tested in the field. The theoretical results are compared with the strains measured in the filed.
