埋地管道强夯动力响应对土体参数的敏感性分析  被引量:5

Sensitivity of dynamic response of buried line pipes under dynamic compaction to soil parameters

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作  者:姚安林[1,2] 赵璐[1] 陈谦 徐涛龙[1] 

机构地区:[1]西南石油大学石油与天然气工程学院 [2]油气消防四川省重点实验室 [3]中国石油天然气销售东部分公司

出  处:《天然气工业》2017年第7期94-100,共7页Natural Gas Industry

基  金:中国石油化工股份有限公司科研项目"川气东送数字化管道系统研发及运行优化技术"(编号:35150000-14-ZC0607-0003);国家科技支撑计划项目"基于风险的油气管道事故预防关键技术研究"(编号:2011BAK06B01-11)

摘  要:为了分析埋地输气管道动力响应对周围土壤主要土体参数的敏感性,建立了夯锤—土体—管道三维实体接触模型,并根据前人强夯试验实测值对模型进行了验证。利用所建模型分析了埋地输气管道在强夯荷载下的动力响应过程,研究了管道等效应力分布对周围土体黏聚力、内摩擦角、弹性模量、泊松比的响应规律,以及管道最大等效应力对以上土体参数的敏感性。结果表明:(1)强夯荷载作用下埋地输气管道发生了较大的位移振动,最大等效应力点位于管道前端XY平面管壁顶部,管道顶部单元等效应力呈单脉冲型;(2)管道等效应力随着周围土体黏聚力、内摩擦角的增大而减小;(3)最大等效应力随土体泊松比的增大而增大,而最小等效应力随土体泊松比的增大而减小;(4)当土体弹性模量为30 MPa时,管道最大等效应力略小于20 MPa时的最大等效应力,而最小等效应力远小于10 MPa时的最小等效应力,但等效应力总体随土体弹性模量的增大而增大。结论认为,土体弹性模量对管道最大等效应力影响最大,其次为内摩擦角和泊松比,黏聚力对其影响最小。A rammer-soil-pipe 3D physical contact model was established and verified by using the data measured in previous dynamic compaction tests in order to analyze the sensitivity of dynamic response of buried gas line pipes to soil parameters. The dynamic response process of buried gas line pipes under dynamic compaction was analyzed with this model. Then, the effect of equivalent stress distribution of line pipes on soil parameters (e.g. cohesion, yield stress, internal friction angle, elastic modulus and Poisson's ratio) was investigated, and the sensitivity of maximum equivalent stress of line pipes to soil parameters was analyzed. It is indicated that under the load of dynamic compaction, a buried gas line pipe vibrates dramatically, the maximum equivalent stress is located at the top of the XY plane in the front end of the pipe, and the equivalent stress at the top unit of the pipe is in the form of single pulse; that,the equivalent stress of the pipe decreases with the increase of cohesion and internal friction angle; that the maximum equivalent stress increases with the Poisson's ratio of soil, while the minimum equivalent stress varies oppositely and that when the elastic modulus of soil is 30 MPa, the maximum equivalent stress of pipe is slightly less than that at 20 MPa, while the minimum equivalent stress is much less than that at 10 MPa. On the whole, however, the equivalent stress of the pipe increases with the elastic modulus of soil. To sum up, the maximum equivalent stress of the pipe is affected most by the elastic modulus of soil, then by internal friction angle and Poisson's ratio, and the least by cohesion.

关 键 词:埋地管道 夯击荷载 土体参数 数值模拟 等效应力 敏感性 黏聚力 弹性模量 泊松比 

分 类 号:TE973[石油与天然气工程—石油机械设备]

 

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