中文摘要：

当围海造陆工程需要覆盖原有海底管线时，对海管的不利影响包括两个方面：其一是隔埝与管线相交处，对管线局部造成较大的附加应力；其二是大面积吹填造陆，使管线受力发生变化．在这两种不利荷载的作用下，管线的安全运营受到威胁．结合实际工程，采用规范设计和有限元分析相结合的方法，分析了大面积吹填对海底管线的影响，并设计采用打桩加盖板的保护措施使隔埝能够安全地跨过海底管线．分析结果和实际观测表明，在现有的工况条件下管线上吹填土高度不宜大于4m．隔埝与管线相交处的保护方案具有有效性．

英文摘要：

When there are submarine pipelines in operation in the reclamation areas, the reclamation activity will have two negative effects on the pipelines： （1）The hydraulic fill will take a large-scale additional load on the partial pipeline; （2） At positions where the dike crosses over the pipeline, the stresses in the pipeline will change. These two negative additional loads may cause failure to the submarine pipeline. Based on the engineering practice, the tradi- tional design method and the finite element method were applied to analyzing this problem. The interaction between the soil and the pipeline was simulated with a spring in finite element modeling. For the local additional load, a simple structure which is composed of wood piles and concrete plates had been designed to protect the pipeline to bear the dike load, The analyzing results show that 4 m is the limit height for the large-scale hydraulic fill and the structure at the crossing position between the dike and pipeline can prevent the pipeline from failure.