It is strict to control the settlement of pipeline,especially in soft soil. In this paper,a special treatment to the foundation of pipelines is made. In order to study the feasibility of this technology,the pre-consolidation, slope excavation, pipe laying and backfill, are simulated by numerical method with emphasis on the dissipation of excess pore water pressure, the process of the settlement. including the settlement of the pipeline and the ground surface. The results show that the settlement of pipeline is 23cm, the ground surface settlement above the pipe is about 30cm by adopting the new technology of the pipeline processing in ideal conditions. It is safe in situation. Consequently, the treatment to the foundation of the pipeline is reasonable.%地下管道工程对管道基础沉降的控制要求严格,特别对于滨海软土地区尤为重要.地下管道施工时对管道的软土地基采取了特殊的处理.为了研究施工方法的可行性,针对堆土预固结、边坡开挖、管道埋设及回填土等主要工况进行了数值模拟,重点对堆土预固结超孔压水消散过程、沉降固结阶段及施工完成后管道沉降和地表沉降进行分析研究.计算结果表明,在理想状态下对软土地基处理后,管道基础沉降约为23 cm,管道正上方地面沉降在30cm左右,可满足管道使用安全,对于明挖管道施工采取的软土地基处理方式是合理可行的.
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