新建抛石海堤对海底光缆影响研究

Study on Influence of New-Built Sea Dike on Submarine Optical Fibre Cable

根据某新建海堤跨越海堤光缆的施工工况,基于ANSYS有限元软件计算分析了抛石海堤施工对光缆力学特性的影响。计算结果表明:在合理安排施工工序的条件下,海堤施工对光缆的影响较小;在极端不利组合条件下,海堤竣工时光缆所受的最大轴力为5.9 t,最大拉伸应变0.44%,均在光缆正常工作范围内;考虑地基土层参数的敏感性,将地基土层的弹性模量降低10%进行计算,结果显示,海堤竣工时光缆所受的最大轴力为6.86t,最大拉伸应变0.51%,仍小于光缆正常工作的允许值。计算分析结果对沿海海堤跨越海底光缆及管道保护设计具有一定参考意义。

Based on ANSYS FEM software,a new-built sea dike across the existing submarine optical fibre cable was studied. The results showed that under the reasonable arrangement of construction process,the dike construction had little effect on the fiber optic cable; in extremely adverse combination of construction conditions,after completion of the work,the cable suffered a maximum axial force of 5. 9t,the maximum tensile strain was 0. 44%,which were within the normal operating range of the cable; considering the sensitivity of the foundation soil parameters,the elastic modulus of the foundation soil was taken with 10% reduction in the calculation,the results showed that the maximum axial force of the cable was 6. 86 t when a causeway work was completed,the maximum tensile strain was 0. 51%,still less than the allowable value for cable work. The calculation result of the analysis has a certain reference value for the coastal causeway across the submarine cable and pipeline protection design.