STUDY ON THE MECHANICAL PROPERTIES OF BAMBOO WINDING COMPOSITE PIPE CULVERT DURING LAYERED BACKFILL CONSTRUCTION PROCESS
This paper addresses the construction control issues of bamboo winding composite pipe culverts during layered backfilling. We investigate the mechanical properties throughout this process by monitoring the deformation and mechanical response of a 2-meter buried depth bamboo winding composite pipe culvert through field measure-ments. A finite element analysis model based on a continuous shell composite laminate is established. The results show that earth pressure and pipe bottom settlement both linearly increase with the increase in backfill height. Dur-ing the shallow burial stage,due to the influence of construction disturbance,the measured values are relatively high-er. After completion of backfilling,the calculated and simulated vertical deformation rates of the pipe culvert are 1.32% and 1.57%,respectively,meeting the code requirements. The pipe bottom settlement and cross-sectional de-formation of the bamboo winding composite pipe culvert can be served as indicators for construction quality control. The model conservatively predicts the pipe-soil response,providing the reference for future studies.