上海交通大学学报

上海交通大学学报（自然版） ›› 2011, Vol. 45 ›› Issue (05): 782-786.

• 水利工程 • 上一篇    

地震荷载作用下海底滑坡特征及其机理

许文锋1，车爱兰2，王治3，王欢2，刘超2   

  1. (1.福建省地质工程勘察院， 福州 350002； 2.上海交通大学 船舶海洋与建筑工程学院，上海 200240； 3.中国石油天然气管道工程有限公司天津设计院， 天津 300280)
  • 收稿日期:2010-11-13 出版日期:2011-05-30 发布日期:2011-05-30
  • 基金资助:

    国家自然科学基金项目（40974070）

Destruction Characteristic of Seabed Landslide during Earthquake Motion and Its Mechanism 

 XU  Wen-Feng-1, CHE  Ai-Lan-2, WANG  Zhi-3, WANG  Huan-2, LIU  Chao-2   

  1. (1.Fujian Geologic Engineering Survey Institute, Fuzhou 350002, China; 2.School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China；3.China Petroleum Pipeline Engineering Corporation Tianjin Institute, Tianjin 300280, China)
  • Received:2010-11-13 Online:2011-05-30 Published:2011-05-30

摘要： 通过多种勘察手段，分析了厦门沪救码头海底滑坡成因及滑坡附近的地形、地层和海洋水动力条件等因素，采用动力有限元法和强度折减法相结合的方法分析海底滑坡在地震荷载作用下的动力响应、海底滑坡动力稳定性的影响因素以及地震荷载与海底滑坡失稳状态之间的关系.结果表明，在地震荷载作用下，软土层之间存在拉应力效应并导致海底滑坡崩塌滑动的危险；动力有限元法和强度折减法相结合并以计算不收敛为判据的方法，适用于分析海底滑坡的地震整体稳定性.当地震作用时，厦门沪救码头海底滑坡的整体稳定安全系数为1.50.

关键词: 海底滑坡, 滑动机理, 动力稳定性

Abstract: According to a variety of survey methods, the status of the seabed slide near the Hujiu terminal in Xiamen city and the topography, stratigraphy, marine hydrodynamics in the surrounding ground and other factors were identified and the sliding mechanism was analyzed. Based on it, the dynamic numerical analytical method were used to discuss the dynamic response of the slide and the factors influencing the stability of slide, the relationship between instability failure and earthquake motions were identified and analyzed by the dynamic finite element method and strength reduction method. As the results, there is obvious negative response phase between the surface soils for it has quite different mechanical characteristics, so that the tensile stress occurs which leads to collapse of seabed slides.

Key words: seabed landslide, sliding mechanism, dynamic stability

中图分类号: