基于应力测量和仿真的阀室管道沉降变形治理

Sedimentation and Deformation Control of Valve Chamber Pipeline Based on Stress Measurement and Simulation

天然气管道是陆上天然气运输的主要方式,在管道运行过程中,由于自然原因的影响,导致天然气管道阀室站内的埋地主管道及地上旁通管道支墩处发生不均匀沉降,会引发安全事故。为确保管道的安全运行,对阀室内的管道建立了模拟仿真模型,分析了应力的分布规律,并利用超声波应力无损测量技术测量了管道的轴向应力。结合应力模拟仿真结果和管道应力测量结果,确定应力集中危险点位置,制定开挖埋地主管道周围土壤的释放应力方案,在治理全过程中使用应变片测量管道轴向应力变化。通过适当去除地面管道约束和调整旁通管道倾斜度的方法,旁通管道的最大应力降低了22 MPa。结果表明,准确掌握埋地管道和旁通管道应力分布规律,针对性地开展应力释放措施和应力评价手段对确保埋地管道和旁通管道服役安全有重要工程价值。

Natural gas pipelines are the main mode of onshore natural gas transportation.During pipe-line operation,due to natural factors,uneven settlement occurs at the buried main pipeline and the support piers of the above ground bypass pipeline in the valve chamber station of the natural gas pipe-line,which can cause safety accidents.To ensure the safe operation of the pipeline,a simulation model is established for the pipeline in the valve chamber,and the distribution law of stress is analyzed.The axial stress of the pipeline is measured using ultrasonic stress non-destructive measurement technology.Based on the results of stress simulation and pipeline stress measurement,the location of stress concen-tration danger points is determined,a plan is developed for excavating the soil around the buried main pipeline to release stress,and strain gauges are used to measure the axial stress changes of the pipeline throughout the entire treatment process.By appropriately removing ground pipeline constraints and ad-justing the inclination of the bypass pipeline,the maximum stress of the bypass pipeline is reduced by 22 MPa.The results indicate that accurately grasping the stress distribution patterns of buried pipe-lines and bypass pipelines,and carrying out targeted stress release measures and stress evaluation methods are of great engineering value in ensuring the safe service of buried pipelines and bypass pipelines.