Uplift response of buried pipelines in saturated sand deposit under earthquake loading
Uplift response of buried pipelines in saturated sand deposit under earthquake loading
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DOI：
10.1016/j.soildyn.2011.05.013
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发表时间：
2011-10-01
影响因子：
4
通讯作者：
Hataf, Nader
中科院分区：
文献类型：
--
作者：
Saeedzadeh, Reza;Hataf, Nader
埋在饱和砂层中的管道，在地震荷载作用下，可能会因产生过量孔隙水压力而导致的隆起而损坏。为了更好地理解管道上浮的机理并通过实验评估缓浮技术的有效性，已经进行了一些研究，但很少进行数值计算来评估土壤性质和现场条件对管道上浮的影响。特别是对于以前埋地的管道，为了确定抗震改造的优先级，评估每个区域的漂浮风险可能是一个问题。研究了天然土的渗透角、密度比、管道直径、埋深、地下水位、饱和土层厚度等参数对管道上拔力的影响。结果表明，埋深对管道的响应有显著影响，地下水位下降存在一个最佳值。(C)2011爱思唯尔有限公司保留所有权利。
Pipelines buried in saturated sand deposits, during earthquake loading could damage from resulting uplift due to excess pore water pressure generation. Several studies have been made to better understand the uplift mechanism and evaluate the effectiveness of mitigating techniques through experiment, but little numerical works have been done to assess the influence of soil properties and field conditions in pipeline floatation. Especially for previously buried pipelines, in order to set the priority for seismic retrofit, evaluating the risk of floatation in each region could be a concern. In this paper, effects of several parameters including dilatancy angle and density ratio of natural soil, diameter and burial depth of pipe, underground water table and thickness of the saturated soil layer on uplift of pipe have been investigated. Results show the prominent role of burial depth in pipe response and that there exits an optimum level for drop of water table to reduce floatation. (C) 2011 Elsevier Ltd. All rights reserved.