如东海上风电场穿堤海缆管线对堤身沉降及渗流的影响

Influence of Cable Pipeline on Dike Settlement and Seepage in Rudong Offshore Wind Plant

为了分析如东海上风电场穿堤海缆管线对海堤的影响,利用有限元方法对已建的穿堤海缆管线附近的海堤进行数值模拟分析。在其他海缆管线完成的情况下,研究了H15#在非开挖定向钻孔施工后海堤的变形场及渗流场。结果表明,钻孔完成后,在钻孔周围产生塑性变形区;在不采用加固防渗措施的情况下,会在管线周围形成集中渗流区域。在长期渗流作用下,由于塑性变形区的扩大而导致进一步的沉降;利用压密注浆法处理后,海堤及其地基的渗流场分布均匀,可有效防止管线周围的集中渗流以及塑性区的扩展,降低穿堤海缆管线对堤身变形的影响。

In order to analyze the impact of the dike-penetrating submarine cable pipeline of the Rudong offshore wind farm on the seawall settlement, this study uses the finite element method to numerically simulate the seawall near the constructed dike-penetrating submarine cable pipeline. The deformation field and seepage field of the seawall at H15#after the construction of the non-excavated directional borehole are investigated with the other pipelines have been completed. The results show that after the completion of the borehole, a plastic deformation zone is generated around the borehole;without reinforcement and seepage control measures, a concentrated seepage area will be formed around the pipeline, which will lead to further settlement due to the expansion of the plastic deformation zone under the long-term seepage action. After treatment with compaction grouting, the seepage field of the seawall and its foundation is evenly distributed, which means the concentrated seepage around the pipeline and the expansion of the plastic zone can be prevented. It can be concluded that the compaction grouting can effectively reduce the influence of the pipeline on the deformation of the embankment.