管道伸缩补偿器在煤层气长输管道塌陷区的适用性研究

Applicability Study of Pipeline Expansion Compensator in Long-distance Pipeline Subsidence Area

文章通过分析目前常见补偿器的适用工况和优缺点,提出了针对跨越塌陷区等复杂地形的管道伸缩补偿器。管道伸缩补偿器能够在煤层气管道所在区域发生地质灾害(如沉降、塌陷导致管道悬空,洪水冲刷导致飘管等)时为管道提供一定量的伸缩补偿,以消除或减小因管道变形带来的应力变化。通过以常见的长输管道为例,计算出使用管道伸缩补偿器前后的最大悬空跨度为和最大的挠度对比情况。计算对比结果表明:在可能的地质沉降区,在管道内接入管道伸缩补偿器后,允许边坡长度可达64m,且边坡支撑面与管道的距离可达到1.52m,能够满足实际地质灾害发生时对管道产生形变应力的挠性补偿,避免管道断裂的发生。

In this paper,by analyzing the applicable working conditions and advantages and disadvantages of common compensators at present,the pipeline expansion compensator for crossing complex terrain such as subsidence area is proposed.The pipeline expansion compensator can provide a certain amount of expansion compensation for the pipeline when geological disasters(such as subsidence and collapse of the pipeline caused by hanging,flood erosion caused by floating pipe,etc.)occur in the region of the long-distance pipeline,so as to eliminate or reduce the stress changes caused by pipeline deformation.Taking common long-distance pipelines as an example,the maximum hanging span before and after using the pipeline expansion compensator is calculated and the maximum deflection is compared.The calculation and comparison results show that in the possible geological subsidence area,the allowable slope length can reach 64m and the distance between the slope support surface and the pipeline can reach 1.52m after the pipeline expansion compensator is inserted into the pipeline,which can meet the flexible compensation of deformation stress of the pipeline when the actual geological disaster occurs and avoid the occurrence of pipeline fracture.