Experimental Study on the Mechanical Response of a Buried Pipeline Under Shear Deformation of Non-cohesive Strata

The uneven deformation of urban strata is difficult to be detected at the early stage of development due to the influence of ground improvement, while the buried pipelines can more conveniently sense this uneven deformation. In order to study the relationship between the deformation of a buried pipeline and the specific distribution of the strata deformation, a model test box with controllable shear value was built for this paper, and the deformation state of the pipeline was obtained by monitoring the strain and displacement during shear. The results show that the shear force and shear displacement of sand under the external shear force were roughly linear related, but its shear strength would rapidly decrease when the slip zone was penetrated, and the shear slip zone of sand had an olive-shaped curve distribution. The buried pipeline produced an S-shaped bending deformation along the longitudinal direction under the action of ground shear, and eventually, the bending failure points will appear on both sides of the shear slip zone.