3D FEM Simulation and Analysis of Compacting Effects on Underground Pipeline by Construction of Single Jacked Pile

Aiming at the practical engineering problem that the construction of jacked piles will do great harms to the adjacent underground pipeline, a rational three-dimensional finite element model was established. Using the displacement penetration method, the complete uninterrupted penetrating process of single jacked pile was simulated based on ABAQUS. The elastoplastic constitution law, large deformation, soil's gravity field, pile-soil friction and pipeline-soil friction contact were taken into account. The compacting effects on underground pipeline by construction of single jacked pile was simulated and analyzed. The influence range, the maximum value of the stress and displacement and the distortion law of the pipeline induced by jacked pile were obtained. The results showed that the horizontal displacement was much bigger than the vertical displacement, and the pipeline would fall at the end close to the symmetric plane and lift at the other end. The principle tensile stress mainly aroused by the pipeline's horizontal displacement would cause tension fracture. The sections of the pipeline near the pile were dangerous, which should be particularly protected. The stress and displacement would increase with the increment of pipeline's embedment or the decrement of the distance between pile and pipeline, and the later's influence was more greater than the former's.