断层局部破裂的三维动力学特性研究-结构工程专业论文.docx

摘要断层局部破裂是引起地震颤动的主要原因之一。“如果 10 年以前你告诉我说某种地震 活动快要出现了，就发生在深大断裂上，而且这些地震活动还有规律可循，我们可以预测 它们会在不久的将来再次发生，那么我会告诉你，你简直疯了”Beroza 说道。很多地质学 家和地震工程学家非常关注断层的局部破裂状态和地震颤动现象。目前国内对地震颤动的 研究还很少，国外华盛顿大学等学校的研究人正在密切的关注这种现象和研究这种问题。 断层局部破裂引起的颤动问题研究有利于我们更深入的认识地震和地下岩石情况以及地 震预报机制。本文首先介绍了断层局部破裂的研究意义和研究状况，提出本人研究的思路和方法， 总结了过去对岩石开裂的研究现状，并且对岩石力学理论和三维动力有限元分析理论进行 了简单介绍和分析。其次以卡斯卡迪亚颤动为研究背景，建立合适的断层局部破裂模型， 利用 ANSYS 软件数值模拟由断层发生错动引起局部破裂的动力响应机理，对比分析了断层 局部破裂不同情况下对地表三维动力响应的影响。通过对模型三维动力学特性的研究分 析，可以认识到断层局部破裂的运动状态和断层局部破坏对地表三维动力响应的影响，为 以后继续研究断层局部破裂和地震颤动现象提供重要参考资料，对地震学和地震工程学有 重要的意义。关键词： 断层局部破坏；地震颤动；数值模拟；动力响应。AbstractPartial fault rupture is one of the main reasons that caused the earthquake tremors. “If you had told me 10 years ago that there was going to be some kind of activity, happening on deep faults, that we could predict was going to happen again soon with some regularity, I would have told you that you were crazy” says Beroza. Many geologists and earthquake engineers are very concerned about the partial rupture of the fault state and earthquake tremors phenomenon. The earthquake tremors study is few, the United States of America abroad University of Washington School of human being to pay close attention to this phenomenon and study this problem. The earthquake tremors problem caused by partial fault rupture of research will help us more in-depth understanding of earthquake and underground rock conditions and earthquake prediction mechanism.This article first introduced fault partial rupture research Significance and research situation, the research ideas and methods, summed up the past to rock cracking research present situation, and to research the theory of rock mechanics and three-dimensional dynamic finite element analysis theory to carry on the simple introduction and analysis. Cass Katia earthquake tremors as the research background, establish suitable earthquake tremors model, ANSYS software Numerical simulation of the fault partial rupture of the dynamic response mechanism by dislocation , the com