Mr. Zheng Zhang Profile

Zheng Zhang

at Shanghai Univ

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Proceedings Article | 28 July 2023 Paper

Numerical simulation of 'thermal-mechanical' coupling of underground cable ducts

Zheng Zhang, Yejiao Wang

Proceedings Volume 12756, 127562D (2023) https://doi.org/10.1117/12.2686034

KEYWORDS: Boundary conditions, Temperature distribution, Dielectrics, Numerical simulations, Air temperature, Finite element methods, Heat flux

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Underground buried cables can improve the efficiency of power transmission and utilizing in the urban underground space. The current load capacity is an important parameter in cable design and operation. When the cables are concentrated in the concrete ducts, the mutual heating increases the temperature of the central cable. concrete pipe laying cable is a commonly used method for high voltage cable because of its high reliability, easy maintenance and convenient replacement. In given concrete duct cross sections and corresponding cable arrangements, the finite element method was used to analyze the temperature field distribution of concrete ducts section with different cable arrangements. The influence of buried depth of concrete duct and thermal conductivity of soil on cable current carrying capacity were discussed. Based on the temperature distribution of concrete pipe, the 'thermal-mechanical' coupling model of cable pipe was established by finite element method, and the distribution characteristics of temperature stress and strain were obtained. The research can provide scientific advice for the conduit’s arrangement and structural form optimization of concrete cable ducts.

Proceedings Article | 28 July 2023 Paper

Numerical simulation of 'thermal-mechanical' coupling of underground cable ducts

Zheng Zhang, Yejiao Wang

Proceedings Volume 12756, 127562D (2023) https://doi.org/10.1117/12.2686034

KEYWORDS: Boundary conditions, Temperature distribution, Dielectrics, Numerical simulations, Air temperature, Finite element methods, Heat flux

Read Abstract +

Proceedings Article | 9 December 2021 Paper

Effects of ultra-freezing/thawing cycles on the mechanical properties and microstructure of Shanghai clay

Zhoufei Yao, Xizhou Du, Zheng Zhang

Proceedings Volume 12030, 120300F (2021) https://doi.org/10.1117/12.2619870

KEYWORDS: Mercury, Nitrogen, Particles, Superconductors, Soil science, Transformers

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High temperature superconducting cable uses liquid nitrogen cooling auxiliary system to cool the superconducting cable body to the superconducting critical temperature, ensures that the cable meets the designed current-carrying capacity, exploring the physical and mechanical properties of rock and soil under the freezing and thawing cycles of liquid nitrogen possesses an important practical significance and engineering practical value. In order to explore the changes in shear strength parameters and internal pore characteristics of Shanghai Clay under different freezing and thawing cycles of liquid nitrogen, indoor direct shear tests and mercury intrusion tests were carried out for Shanghai remolded clay that had undergone different freezing and thawing cycles. The results showed that the Shanghai Clay had undergone extremely low temperature after freezing and thawing, its cohesive force gradually decreased while the internal friction angle showed an increasing trend. the mercury intrusion tests results show that the freezing and thawing of liquid nitrogen makes the pore ratio of small pores and ultra-micropores of soil samples decreased, while micropores increased, the internal pore diameter shows a trend that concentrated in the category of micropores; more contact areas were created as a result of the small pore diameter and void ratio decreased, resulting in the increase of soil friction angle. The reduction of micropores and ultramicropores reduced the cementation between clay particles and the cohesive force generated by electrostatic attraction.

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