Response of Repaired Sewers under Earthloads

Abstract. The trenchless rehabilitation of damaged rigid sewers has become a competitive alternative to conventional methods of pipeline replacement. However, buckling caused by fluid load is identified as the important limit state in the current pipe liner design standard, while the contribution of the damaged rigid host pipe in the assessment of resistance to earth loads, as well as disturbance to the liner (e.g. vehicle loads) are neglected. Full scale testing in the laboratory is used to investigate the soil-host pipe-liner interaction. Two host pipe-liner systems are examined. The first system involves a liner which fits perfectly inside a host pipe. The second system features initial lack of fit between liner and the host pipe, and gaps across the fractures in the host pipe, to investigate ungrouted repair of rigid pipe with severe damage. The test geometry and measurement scheme t