|
|
|
| Study on the mechanical behaviors of buried water supply pipelines under the effect of erosion void |
| ZHANG Wenjun1,2, ZHU Zhankui1,2, LI Yao1,2, ZHANG Gaole1,2
|
1. School of Civil Engineering, Tianjin University, Tianjin 300354, China;
2. Key Laboratory of Coast Civil Structure Safety of the Education Ministry, Tianjin University, Tianjin 300354, China |
|
|
|
|
Abstract Based on the finite element software ABAQUS, taking buried carbon steel pipes and ductile iron pipes as the research objects, and considering the operating load of pipelines, a full-circumferential foundation spring model of the buried water supply pipeline was established. The impact of erosion void on the mechanical behaviors of two kinds of pipelines was studied systematically by the above model. The results showed that erosion void was an important factor affecting the safety performance of buried water supply pipelines. And when the length of the erosion void increased to a certain extent, the axial stress of the pipelines caused by the erosion void would be greater than the hoop stress, which would become the controlled stress that the pipelines bear. Internal pressure was one of the main factors causing the stress of pipeline, but its influence on the longitudinal nonuniform settlement of pipeline was very small and could be ignored. Burial depth and surface load are two important causes of the stress and displacement of pipeline. When the pipelines were buried in the carriageway, attention should be paid to pipelines with a buried depth of less than 1.0 m, and special attention should be paid to pipelines with a buried depth of greater than 4.0 m and less than 0.5 m. The research results of this paper could provide support for the safety assessment and operation management of buried water supply pipelines.
|
|
Received: 13 July 2020
Published: 20 September 2020
|
|
|
|
|
|
|
|
