Thermal-mechanical coupling simulation analysis of submarine armored cable soil environment

Abstract

Due to the complex and diverse seabed environment, the coupling effect of high depth and temperature will seriously affect the operation stability of submarine cables. Therefore, the thermal-mechanical coupling model and inherent characteristics of submarine armored cables in soil environment are simulated and analyzed. Firstly, the influence of different buried depth and surrounding seawater temperature on cable temperature in soil environment is studied. Then the natural frequency of the cable is obtained by modal analysis. Since the low frequency vibration mainly occurs in the operation process, the high frequency vibration is not easy to excite and decay quickly, only the first eight order vibration is considered. The results show that it is beneficial to avoid the vibration near the resonance frequency, to lay in the relatively shallow position and to reduce the buried depth appropriately.