回填软土中管道上浮力测试及计算方法

管道已成为中国油气等流体输送的重要方式,在沿海软土地区中浅埋管道上浮事故屡有发生,严重威胁着能源生命线工程的安全。研发了一套回填软土中浅埋管道上浮力测试的装置及方法,针对常用输气管道开展了足尺模型试验,获得了不同扰动程度软土中的管-土相互作用及管道上浮力,揭示了回填软土中管道的上浮机理。基于多批次不同扰动程度软土中管道上浮力的测试结果,提出了与回填软土不排水剪强度相关的管道上浮力计算方法。

Tests and methods for buoyancy of pipelines in backfill soft clay

The pipeline has become an important way for the transmission of oil, gas and other fluid in China. However, floating accidents of shallow pipelines often occur in coastal soft clay areas, which seriously threaten the security of energy lifeline engineering. A set of test devices and methods for buoyancy of pipeline are proposed. Full scale model tests on commonly-used gas pipeline are carried out to get pipe-soil interaction and pipeline buoyancy in soft clay with different disturbance degrees, and then the mechanism of pipeline floating is revealed. Furthermore, a calculation method for prediction of buoyancy of pipelines, which is related to the undrained shear strength of backfill soft clay, is proposed based on the test results of buoyancy of pipelines in several batches of backfill soft clay with different disturbance degrees.