| CHEN Zhi-hua,TONG Yu-dong,ZHANG Chuan-jie,LIU Yan-bo,CHEN Rong-qi.Erosion Performance of Coating on Inner Surface of Corrugated Metal Pipe[J],51(11):205-214 |
| Erosion Performance of Coating on Inner Surface of Corrugated Metal Pipe |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.11.018 |
| KeyWord:corrugated metal pipe erosion wear sediment-laden flow open channel flow condition regression fitting erosion experimen |
| Author | Institution |
| CHEN Zhi-hua |
Harbin Engineering University, Harbin , China |
| TONG Yu-dong |
Harbin Engineering University, Harbin , China |
| ZHANG Chuan-jie |
Offshore Oil Engineering Co., Ltd., Tianjin , China |
| LIU Yan-bo |
Harbin Engineering University, Harbin , China |
| CHEN Rong-qi |
Offshore Oil Engineering Co., Ltd., Tianjin , China |
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| Abstract: |
| Corrugated metal pipe is a corrugated pipe with steel as the base and galvanized, aluminum and other materials on the surface. Because it has the characteristics of light weight and strong resistance to foundation deformation, it is widely used in drainage systems such as bridges and culverts. The recent failure cases of corrugated metal pipe at home and abroad show that the erosion damage of the inner wall coating under the condition of gentle slope will also seriously affect the service life of the pipe. This work aims to study the erosion problem of sediment laden flow on the inner surface coating of corrugated metal pipe under the condition of open channel through the physical model test, so as to clarify the erosion mechanism and characteristics.In this paper, the self-built circulating test tank platform was used to carry out the erosion test of sediment laden flow in corrugated metal pipe. The bellows was designed as three parts of pipe section A, B, and C. According to the change of flow velocity, the corrugated cross section and measuring point of each pipe section were selected. When the erosion time reached 200 h, 400 h and 600 h under the working conditions of 0.12 mm, 0.24 mm and 0.47 mm, the erosion amount of the inner surface coating at different positions under different working conditions was obtained. Scanning electron microscope was used to observe the erosion morphology of the B2 section under the 0.47 mm working condition, and it was found that the erosion pits at the wave crest and the upstream surface were closely distributed, and the erosion of the coating was the most serious. Due to the influence of the velocity of sand particles near the wall and the uneven sand content, in a ripple period along the direction of the water flow, the erosion amount at the wave crest was the largest. On the upstream and downstream surfaces with the wave crest as the symmetry axis, the erosion rate of the upstream surface was greater than that of the downstream surface at the corresponding position. On the cross-section perpendicular to the direction of water flow, the amount of erosion at the central axis was the largest, and gradually decreases toward both sides. Under the same conditions, the erosion rate was the largest when the sand particle size was 0.47 mm, and the maximum erosion rate at T0 section reached 6.31 μm/100 h.The test results show that the erosion mechanism of the coating on the surface of the pipe is the result of the joint action of micro-cutting wear and deformation wear, and the coating on the inner surface of the pipe is thinned until it disappears due to particle erosion, which leads to the acceleration of the failure rate of the pipe. The erosion rate at the wave crest position is the largest. With the crest as the axis of symmetry, the erosion rate on the upstream surface is greater than the erosion rate on the back surface of the corresponding position. There is a linear relationship between erosion rate and sand particle size, which increases with the increase of sand particle size. The wall erosion rate has a power exponential relationship with the sand velocity near the wall. The velocity index is different in different cross sections, and the maximum value of velocity index appears in the crest section. |
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