Liquefaction Mechanism for Saturated Sand Around Underground Structure:Centrifuge Model Tests and Microstructural Analyses

摘要：

　　Based on centrifuge model tests and digital image processing technology, this paper pro vides new insights into the liquefaction mechanism for saturated sand and the uplift behavior of un derground structure under seismic action.A series of dynamic centrifuge model tests on saturated sand deposits with and without structure model were performed.Herein, a high-speed microscopic camera was installed in the structure model, by which the movements of particles around under ground structure were recorded.Then a two-dimensional digital image processing technology was used to analyze the microstructure of the saturated sand during the shaking event.The models invol ving structure model show that high excess pore pressure occurs around the bottom of the structure.In the case of shallow buried structure, uplift behavior of structure model can be observed signifi cantly.Micro mechanical explanations obtained from centrifuge model tests are presented to prove the phenomenon of saturated sand liquefaction in macro-scale.

关键词： liquefaction microstructure centrifuge modeling underground structure saturated sand

作者: Z.H.Wang J.Zhou X.L.Chen

作者单位: Department of Geotechnical Engineering, Tongji University, Shanghai, China

会议类型: 国际会议

会议名称: 第六届国际环境振动学术研讨会(6th International Symposium on Environmental Vibration)(ISEV2013)

会议地点: 上海

会议语种:英文

页码: 522-529

在线出版日期: 2013-11-08（万方平台首次上网日期，不代表论文的发表时间）