地震液化离心机振动台模型试验与LEAP研究进展  

Centrifugal shaking table tests on soil liquefaction and progress of LEAP projects

作　　者：周燕国[1] 马强[1] 刘凯[1,2] 曹渊 陈云敏 ZHOU Yanguo;MA Qiang;LIU Kai;CAO Yuan;CHEN Yunmin(Institute of Geotechnical Engineering,MOE Key Laboratory of Soft Soil and Geoenvironmental Engineering,Center for Hypergravity Experiment and Interdisciplinary Research,Zhejiang University,Hangzhou 310058,China;China State Construction Silkroad Construction Investment Group Co.,Ltd.,Xi'an 710000,China)

机构地区：[1]浙江大学岩土工程研究所,浙江大学软弱土与环境土工教育部重点实验室,浙江大学超重力研究中心,浙江杭州310058 [2]中建丝路建设投资有限公司,陕西西安710000

出　　处：《岩土工程学报》2024年第1期54-62,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51988101,52278374,51978613);高等学校学科创新引智计划(111计划)项目(B18047)。

摘　　要：离心机振动台模型试验是研究地震液化问题的重要手段,一方面可重现场地地震响应和揭示液化致灾规律,为发展工程设计方法提供依据;另一方面可以作为特定边值问题的标准模型试验数据,验证数值方法与土体本构模型及其参数选取的合理性。介绍了离心机振动台模型试验的试验原理,回顾了离心机振动台模型试验在地震液化领域的主要研究进展。围绕由中国、美国、日本和英国等国家高校与研究所联合开展的国际合作项目“液化试验与分析”(LEAP),重点介绍了若干为提高离心机振动台模型试验可重复性而发展的物理模拟新技术,包括离心机振动台的台面振动控制技术、模型土体弹性波速测试技术和基于图像分析的动态位移监测技术等。最后针对地震液化领域的若干工程和研究需求,探讨了离心机振动台模型试验领域的发展趋势。The centrifugal shaking table test is one of the most promising approaches to study soil liquefaction problems.On one hand,it can reproduce seismic response and reveal the ground failure mechanism induced by soil liquefaction,providing the scientific basis for developing the design methods for engineering practices;on the other hand,the test results can verify the relevant methods and constitutive models for soils used in numerical simulation.The principles of the centrifugal shaking table tests are briefly introduced and the research progress of centrifuge modeling for soil liquefaction problems are reviewed.Then the liquefaction experiments and analysis project(LEAP)and its verification and validation procedures are described.The new techniques developed to improve the repeatability of the centrifugal shaking table tests are introduced,including the shaking control of the shaking table,measurements of elastic wave velocities under high centrifuge acceleration,and particle image velocimetry(PIV)-based real-time monitoring of dynamic displacements.Finally,the research trends of the centrifugal shaking table tests in the field of soil liquefaction are discussed.

关 键 词：地震液化 离心机模型试验 物理模拟 振动台 VELACS LEAP 相似律 

分 类 号：TU411.8[建筑科学—岩土工程] TU435[建筑科学—土工工程]