A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Laboratory tests and thermal buckling analysis for pipes buried in Bohai soft clay
Abstract Upheaval buckling of submarine pipelines occurs due to relative movement of pipeline and surrounding soil and is often triggered by high operational temperature of the pipeline, initial imperfection of the pipeline, or a combination of both. Since buckling can jeopardize the structural integrity of a pipeline, it is a failure mode that should to be taken into account for the design and in-service assessment of trenched and buried offshore pipelines. In this study, a series of vertical (uplift) and axial pullout tests were carried out on model pipe segments buried in soft clay deposit similar to that present in Bohai Gulf, China. Pipe segments with three different diameters (= 30 mm, 50 mm and 80 mm) were buried in different depth-to-diameter ratios ranging from 1 to 8. Based on the results of laboratory tests, nonlinear force–displacement relations are proposed to model soil resistance mobilized during pipeline movement. The proposed nonlinear soil resistance models are employed in finite element analysis of buried pipelines with different amplitudes of initial geometric imperfections. Thermal upheaval buckling behavior of pipelines operating at different temperatures is studied. Results show that the capacity of pipeline against thermal buckling increases with the burial depth and decreases with the amplitude of initial imperfection.
Highlights 24 vertical uplift tests and 21 axial pullout tests were carried out on model pipe segments buried in soft clay. Nonlinear soil spring models are established to model soil resistance mobilized during pipeline movement. The proposed nonlinear soil spring models are employed in thermal buckling analyses of initially imperfect pipelines buried in the Bohai Gulf.
Laboratory tests and thermal buckling analysis for pipes buried in Bohai soft clay
Abstract Upheaval buckling of submarine pipelines occurs due to relative movement of pipeline and surrounding soil and is often triggered by high operational temperature of the pipeline, initial imperfection of the pipeline, or a combination of both. Since buckling can jeopardize the structural integrity of a pipeline, it is a failure mode that should to be taken into account for the design and in-service assessment of trenched and buried offshore pipelines. In this study, a series of vertical (uplift) and axial pullout tests were carried out on model pipe segments buried in soft clay deposit similar to that present in Bohai Gulf, China. Pipe segments with three different diameters (= 30 mm, 50 mm and 80 mm) were buried in different depth-to-diameter ratios ranging from 1 to 8. Based on the results of laboratory tests, nonlinear force–displacement relations are proposed to model soil resistance mobilized during pipeline movement. The proposed nonlinear soil resistance models are employed in finite element analysis of buried pipelines with different amplitudes of initial geometric imperfections. Thermal upheaval buckling behavior of pipelines operating at different temperatures is studied. Results show that the capacity of pipeline against thermal buckling increases with the burial depth and decreases with the amplitude of initial imperfection.
Highlights 24 vertical uplift tests and 21 axial pullout tests were carried out on model pipe segments buried in soft clay. Nonlinear soil spring models are established to model soil resistance mobilized during pipeline movement. The proposed nonlinear soil spring models are employed in thermal buckling analyses of initially imperfect pipelines buried in the Bohai Gulf.
Laboratory tests and thermal buckling analysis for pipes buried in Bohai soft clay
Liu, Run (author) / Basu, Prasenjit (author) / Xiong, Hao (author)
Marine Structures ; 43 ; 44-60
2015-05-04
17 pages
Article (Journal)
Electronic Resource
English
Laboratory tests and thermal buckling analysis for pipes buried in Bohai soft clay
| Online Contents | 2015
Analysis of repeated-load laboratory tests on buried plastic pipes in sand
| Online Contents | 2011
Analysis of repeated-load laboratory tests on buried plastic pipes in sand
| British Library Online Contents | 2011
Laboratory Tests on Thermal Improvement of Soft Clay Under Elevated Temperatures
| Springer Verlag | 2018