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Innovation design of long-distance pipelines buried under high-filling planned roads

机译：高填筑路下埋设长输管道的创新设计

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If a long-distance gas pipeline is unavoidably buried under a planned high-filling road, the high fill subgrade setting will result in the change of the pipe's mechanical shape and the local stress concentration on the pipe, which will pose threats to the safe operation of the pipeline. Protection culverts are generally adopted to solve this issue, but the construction of protection culverts are difficult and high in cost and usually unable to meet the requirements of construction schedule of the planned road project by the local government. For this reason, the stress on pipelines in high fill subgrade was analyzed and a rectification measure was proposed and its safety and rationality was also calculated. The results show that increasing pipe thickness is a feasible rectification measure. Thus, we analyzed the stability of and stress on the pipe caused by the uneven high fill setting by using the ABAQUS finite element software package, in which the pipe was simulated as the beam element, the backfill above the pipe as the stress load, and the elastic foundation underneath the pipe as the evenly-distributed spring. From the stress cloud charts, we can see the stress concentration on the pipe where a sudden change occurs in high fill setting. Without proper measures, accidents would be inevitable in the end. The analysis results from the ABAQUS also show that the scheme of increasing the pipe thickness will be the most cost-effective and practical way to deal with the stress resulted from the uneven high fill setting above the pipe. But it is pointed out that the pipeline laying route should avoid planned high filling roads as far as possible to ensure its safe operation.
机译：如果长途输气管道不可避免地埋在计划的高填筑路下，则高填筑路基设置将导致管道的机械形状和管道上的局部应力集中发生变化，从而对安全操作构成威胁。的管道。解决该问题一般采用防护涵，但防护涵施工难度大，成本高，通常不能满足地方政府计划的道路工程施工进度的要求。为此，分析了高填方路基对管道的应力，提出了整改措施，并计算了其安全性和合理性。结果表明，增加管厚是可行的整改措施。因此，我们使用ABAQUS有限元软件包分析了由高填充不均匀导致的管道的稳定性和应力，其中以管道为梁单元模拟了管道，以管道上方的回填作为​​应力载荷，并且管道下方的弹性基础是均匀分布的弹簧。从应力云图，我们可以看到在高填充设置中突然发生变化的管道上的应力集中。没有适当的措施，事故最终将不可避免。 ABAQUS的分析结果还表明，增加管道厚度的方案将是处理因管道上方高填充不均匀而导致的应力的最具成本效益和最实用的方法。但要指出的是，管道铺设路线应尽量避开规划的高填方道路，以确保其安全运行。

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