长输管道弹性敷设应力测试与分析

Stress Test and Analysis of Elastic Laying of Long-distance Pipeline

为确定长输管道弹性敷设及下沟过程前后的应力状态,采用基于实测数据的力学分析与有限元仿真的方法对局部管段开展了弹性敷设过程应力测试,确定了管道敷设应力水平与成因。研究结果表明:管道在敷设过程中表现出较大弯曲应力,且弯曲方向频繁变化,施工过程对弹性敷设管道应力状态有显著影响;在管道敷设过程中应避免较长的悬空段,适当增强管道约束,优化施工流程;为降低敷设应力,建议超过一定大角度弯头的管段采用沟下组焊等对管道应力影响较小的施工方式。该研究有助于加深对管道弹性敷设应力的认识,可为管道应力监测提供依据。

In order to determine the stress state of long-distance pipeline before and after elastic laying and trenching,the stress test of local pipeline sections during elastic laying is carried out by using the method of mechanical analysis and finite element simulation based on the measured data,and the stress level and causes of pipeline laying are determined.The research results show that the pipeline shows large bending stress during the laying process,and the bending direction changes frequently.The construction process has a significant impact on the stress state of the elastic laying pipeline.Long suspended sections should be avoided in the process of pipeline laying,properly strengthen pipeline constraints and optimize the construction process.In order to reduce the laying stress,it is suggested that the pipe section exceeding a certain large angle elbow should adopt the construction methods such as under ditch assembly welding which have little impact on the pipeline stress.This study is helpful to deepen the understanding of the elastic laying stress of pipelines,and can provide a basis for the stress monitoring of pipelines.