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Pipe-jacking and microtunneling technologies are being more widely used over the past decade and there is significant interest to predict the jacking forces and jacking distances achievable in order to achieve more efficient design and construction. This study focuses on the evaluation of the frictional characteristics and factors affecting the shear strength of pipe-soil interfaces. Six different pipes made from fiber reinforced polymer (FRP), polycrete, steel, concrete, and vitrified clay were tested using a new apparatus designed to conduct conventional interface shear testing on pipes of different curvature. In addition, roughness tests were performed using a stylus profilometer to quantify the surface characteristics of the individual pipes and relate these to the interface shear behavior. To extend the range of roughness values tested, two artificial pipe surfaces were created using rough sandpapers. Interface shear tests were performed using the new apparatus with air-pluviated dense specimens of Ottawa 20/30 sand.
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