A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Deformation of buried large diameter steel pipes during staged construction and compaction-case study and finite element analysis
Abstract Deflection control of large diameter steel pipes, as a part of water infrastructure, has been a significant serviceability concern to utilities and water authorities. The horizontal pressure due to soil compaction during installation significantly affects the final deflection of these pipes. In current work, the deflection of a buried 2100 mm (84 in.) diameter steel pipe with a thickness of 9.5 mm (0.375 in.) over a length of 120 m (400 ft.) is measured using the laser video profile method and compared to allowable limits. In addition, three-dimensional nonlinear finite element analysis of the soil-pipe system has been carried out, where staged construction has been modeled through a step-by-step change of the FE mesh and geometry. The compaction-induced horizontal pressure on the pipe is estimated based on well-known theory of elasticity formulations and is applied to the pipe-soil system using an equivalent thermal loading. The developed FE model is validated with the performed field measurements and results from literature, where compaction of the surrounding soil is carried out using embedment wheels and jumping jack rammers. Results show that the proposed method for compaction modeling is accurately predicting the maximum and final deflections of large diameter steel pipes buried in trenches with rigid and flexible walls. However, more comprehensive experimental and numerical studies seem necessary for full implementation and predicting deflection in the intermediate stages of construction for soft soils.
Deformation of buried large diameter steel pipes during staged construction and compaction-case study and finite element analysis
Abstract Deflection control of large diameter steel pipes, as a part of water infrastructure, has been a significant serviceability concern to utilities and water authorities. The horizontal pressure due to soil compaction during installation significantly affects the final deflection of these pipes. In current work, the deflection of a buried 2100 mm (84 in.) diameter steel pipe with a thickness of 9.5 mm (0.375 in.) over a length of 120 m (400 ft.) is measured using the laser video profile method and compared to allowable limits. In addition, three-dimensional nonlinear finite element analysis of the soil-pipe system has been carried out, where staged construction has been modeled through a step-by-step change of the FE mesh and geometry. The compaction-induced horizontal pressure on the pipe is estimated based on well-known theory of elasticity formulations and is applied to the pipe-soil system using an equivalent thermal loading. The developed FE model is validated with the performed field measurements and results from literature, where compaction of the surrounding soil is carried out using embedment wheels and jumping jack rammers. Results show that the proposed method for compaction modeling is accurately predicting the maximum and final deflections of large diameter steel pipes buried in trenches with rigid and flexible walls. However, more comprehensive experimental and numerical studies seem necessary for full implementation and predicting deflection in the intermediate stages of construction for soft soils.
Deformation of buried large diameter steel pipes during staged construction and compaction-case study and finite element analysis
Emami Saleh, Arash (author) / Hojat Jalali, Himan (author) / Pokharel, Amit (author) / Abolmaali, Ali (author)
2021-08-27
Article (Journal)
Electronic Resource
English