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Evaluation of Aseismic Design Parameter of Buried Pipeline during Liquefaction

埋地管道液化过程抗震设计参数评价

基本信息

批准号：
07650561
负责人：
FUCHIDA Kunihiko
金额：
$ 1.41万
依托单位：
YATSUSHIRO COLLEGE OF TECHNOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650561/
关键词：
BURLED PIPELINE LIQUEFACTION SEISMIC RESPONSE MODEL TEST LATERAL FLOW NON-LINEAR A BEAM ON AN ELASTIC FOUNDATION

项目摘要

Objects of this study are to clarify the non-linearly behavior characteristics of buried pipeline subjected to large ground deformations and to evaliate the important parameters such as soil spring or joint spring for the effective aseismic design model. Particularly we focussed on the large ground deformations induced by soil liquefaction during strong ground motion and performmed laboratory test for the soil springs and build up the analytical method for seismic response of buried pipeline including its joints. Liquefaction tests using the the model pipeline in sand box on shaking table are performed. From the results of shear strains, pore pressures and accelerations the non-linearly characteristics of restorning forces of pipeline-ground system during soil liquefaction are investigated. Experiment for the lateral flow induced by soil liquefaction is also performed. Analytical method which simulates the ground improving method against liquefaction as dynamic compacting method is also developed for evaluating the effects of the countermeasure against liquefaction.Numerical analysis programs for soil liquefaction and lateral flow induced by it are developed on 2 dimensional FEM.Accuracy of these methods is confirmed by comparing the analytical results with experimental or measured results. Behavior of pipeline in soil liquefaction environment is analyzed, which is based on a beam on an elastic foundation. Using modified transfer matrix method as analytical tool, numerical computations are performed for displacements and internal forces of pipeline and joints, and important parameters for aseismic of pipeline are evaluated.

研究目的是阐明大变形条件下埋地管道的非线性特性，并对有效的抗震设计模型中的重要参数如土弹簧或接头弹簧进行评价。特别是针对强地震作用下土壤液化引起的地面大变形问题，进行了土弹簧的室内试验，建立了含接头的埋地管道地震反应分析方法。在振动台砂箱中进行了管道模型的液化试验。根据土的剪应变、孔隙水压力和加速度的测试结果，研究了液化过程中管道-地面系统的地震力的非线性特性。对液化引起的侧流进行了试验研究。在此基础上，建立了将地基加固方法模拟为动力挤密法的分析方法，并在二维有限元上编制了液化及液化引起的侧流数值分析程序，通过与试验或实测结果的比较，验证了分析方法的准确性。以弹性地基梁为基础，分析了管道在土壤液化环境中的受力特性。以修正传递矩阵法为分析工具，对管道和节点的位移和内力进行了数值计算，并对管道抗震的重要参数进行了评估。