IMHE OpenIR  > 山地灾害与地表过程重点实验室
输油气管道在浅层滑坡作用下的响应分析
Alternative TitleResponse Analysis of Oil and Gas pipelines
Language中文
赵旭阳
Thesis Advisor赵宇
2014
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Name硕士
Degree Discipline建筑与土木工程
Keyword管道 浅层滑坡 管土相互作用 应变分析 安全校核
Abstract浅层滑坡是管道沿线分布较为广泛且对管道造成危害最多的灾种之一,对管道的安全运行构成了很大的威胁和侵害。本文结合野外调查结果和工程实践,应用ANSYS有限元软件,选取土弹簧模型建立了横向滑坡作用下管道有限元模型,并基于应变设计思想建立了横向滑坡作用下管道评估准则,最后对不同位移条件下管道的应变进行了分析。通过以上研究,本文取得的结论和成果如下: (1)管道沿线分布较多且对管道造成危害较大的是浅(表)层滑坡,滑体物质以土质和碎石土为主,岩质滑坡较少。滑坡引发原因大多是由管沟开挖长时间未回填引起的。 (2)横向滑坡作用下,管道轴向应变沿管道中心位置成轴对称分布特点,两个危险的位置出现在滑坡交界处以外5m左右的位置以及滑坡作用中心位置; (3)降低管道的埋深以及增加管道的壁厚可以有助于管道增强承受滑坡位移的作用。但是在后续分析中发现,滑坡宽度为20m的时候,增加管道壁厚并不能改善管道承受应变的能力,有时候甚至不利于其承受应变。因此在通过增加壁厚改善管道承受应变能力时需要考虑滑坡规模的影响。 (4)我国输油气管道抗震设计规范提出的管道极限压应变计算公式与SUZUKI公式以及CSA计算公式相比是偏于安全的。由于目前我国还没有建立关于基于应变设计的准则,因此选择管道极限压缩应变准则时,可以参考现有的研究成果:当不考虑设计内压时,可以选择我国规范提出的计算公式;考虑设计内压时,可以选择CSA计算公式作为横向通过滑坡时管道极限压缩应变的判断准则。 (5)滑坡宽度为10m时,管道最大轴向应变随着滑坡位移的增加最终会变为一个定值,而且此值不超过管道极限应变;而宽度大于20m的滑坡,管道最大轴向应变随着滑坡位移的增大而增大,最终会进入到严重的塑性阶段,使管道破坏。 (6)当滑坡宽度大于20m,滑动距离超过2m时,管道最大轴向压缩应变已超过1%,达到这种状态时管道已经进入严重的塑性状态,因此管道可能产生压缩破坏;另外,此时的拉伸应变也在2%左右,因此管道也有可能被拉断。
Other AbstractAbstract Shallow landslide, widely distributed along pipelines, is one of the most serious hazards that posing a great threat to the pipeline safe operation. Combining with field investigations and engineering practice, the soil-spring model is established using ANSYS software to simulate pipeline subjected to lateral landslide, what’s more, the assessment criteria is also established. In the end, the pipeline strain under different displacement is analyzed. In this paper, on the basis of the above study, some conclusions and results are obtained: (1) The shallow landslides alone the pipelines are more common and bring more damage to the pipeline and the materials of landslide are mainly soils or gravels, rocks seldom. Among the many causes of the landslide, we must give more attention to the landslide caused by the trench excavation. (2) Pipeline axial strain distribution along the pipeline is symmetry subjected to lateral landslide. The pipeline center and the junction of about 5m outside landslide are the two dangerous positions; (3) To reduce the depth of the pipeline or increase pipe wall thickness can contribute to reducing pipeline strain. However, in the subsequent analysis, finding that when the slide width is 20m, increasing the pipe wall thickness can’t be improved the pipeline ability to withstand strain, sometimes even harmful for pipelines to withstand the strain. Therefore, in considering of using increasing pipe wall thickness to improve pipeline bearing strain ability, need to consider the effect of landslide scale. (4) Pipeline compressive strain limit is conservative in our country’s oil and gas pipelines for seismic design standard, comparing to the formula proposed by SUZUKI and CSA formula. Because our country has not established guidelines on the strain-based design method, so when choosing pipeline ultimate compressive strain can referring to existing research results。When determine the pipeline subjected to lateral landslide ultimate compressive strain, if not considering the internal pressure, the formula proposed by our norms is suitable; if considering the internal pressure, the CSA formula is a best choice. (5) The pipeline axial strain will eventually become a fixed value under the displacement when the landslide width is 10m, and this value does not exceed the pipeline strain limit; while the landslide width is greater than 20m, pipeline axial strain increases with the displacement increasing, and eventually into severe plastic stage, meaning that the pipe is damaged. (6) When the slide width is large, greater than 20m and the sliding distance is more than 2m, the maximum axial compressive strain of the pipe will be more than 1%, this state means that pipeline has entered serious plastic state, the pipe may occur buckling damage; also, at this time, the tensile strain are about 2%, therefore pipeline may also occur crack damage.
Document Type学位论文
Identifierhttp://ir.imde.ac.cn/handle/131551/7821
Collection山地灾害与地表过程重点实验室
Recommended Citation
GB/T 7714
赵旭阳. 输油气管道在浅层滑坡作用下的响应分析[D]. 北京. 中国科学院研究生院,2014.
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