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兰成渝成品油管道在甘肃康县段遭受了严重的落石灾害,其中08年汶川地震触发的阳坝落石造成管道破坏和巨大经济损失。根据对阳坝落石现场的调查和管道遭受落石冲击的分析,为管道在康线段的减灾防灾提供理论依据和分析方法。系统对比分析了国内外普遍采用的5种落石冲击力算法,并推荐了最出符合实际的算法。通过现场取样和室内实验获取土体力学强度参数,经与工程地质手册推荐的经验数据比对后选择最适合的参数进行计算。选取Marston提出的沟内埋管竖直土压力计算模型分析管道的应力与变形,结果表明:(1)事故原因是管材自身的强度和变形不足以抵抗落石产生的巨大冲击荷载,应力和变形均失效。(2)在落石区进行管道设计时,建议引入日本道路公团方法计算落石最大冲击力。(3)管道在康县区域内再次遭受崩塌灾害的概率很大,有必要对区域内崩塌灾害点进行重点排查,做好相应的管道防护措施。
Lan Chengyu oil pipeline suffered a serious rockfall disaster in Kangxian section of Gansu Province. Among them, Yangba falling rock triggered by the 2008 Wenchuan earthquake caused pipeline destruction and huge economic losses. Based on the investigation of the Yangba rockfall site and the analysis of the impact of the rockfall on the pipeline, it provides a theoretical basis and analysis method for the pipeline disaster mitigation and disaster prevention in the Kang Line. The system compares and analyzes five commonly used rockfall impacting algorithms at home and abroad and recommends the most practical algorithm. The soil mechanical strength parameters were obtained through on-site sampling and laboratory experiments. After comparing with the empirical data recommended by Engineering Geology Manual, the most suitable parameters were selected for calculation. The stress and deformation of the pipeline are analyzed by using the calculation model of vertical earth pressure of buried pipe proposed by Marston. The results show that: (1) The reason of the accident is that the strength and deformation of the pipe itself are not enough to resist the huge impact load, stress and deformation Failure. (2) When designing the pipeline in the rockfall area, it is suggested to introduce the method of Japanese road corps to calculate the maximum impact force of rockfall. (3) There is a great probability that the pipeline will suffer another collapse in Kangxian area. It is necessary to conduct a focus investigation on the collapsing disaster areas in the area and make appropriate pipeline protection measures.