地震荷载作用下边坡稳定性分析-建筑与土木工程专业论文.docxVIP

中文摘要 中文摘要 重庆大学硕 重庆大学硕士学位论文 I I PAGE PAGE IV 摘 要 我国是多地震的国家，上世纪以来发生过多次强烈地震。根据近几十年的地 震次数和地震烈度分析，我国发生的地震有增大的趋势，并且有震源浅，强度大， 频率高的特点，主要集中在中西部地区。我国还是一个多山国家，特别是西南地 区存在大量的自然边坡和人工边坡。在地震荷载作用下容易触发这些边坡失稳， 产生滑坡造成大量的人员伤亡和财产损失。因此研究地震作用下边坡稳定性具有 重要的理论意义和使用价值。主要研究工作如下： ①基于有限元强度折减法，分析了自重作用下边坡的稳定性，确定了边坡的 安全系数。研究了粘聚力、内摩擦角对边坡稳定性的影响，获得了应力应变和位 移的分布规律。 ②采用粘弹性边界和有限元强度折减法，分析地震荷载作用下边坡的稳定性， 确定了地震荷载作用下边坡的动力安全系数，研究地震荷载作用下粘聚力、内摩 擦角对边坡安全系数的影响。获得了地震荷载作用下边坡位移和应力应变的分布 规律。和自重作用相比，地震荷载作用下边坡的安全系数减小，位移增加。 ③结合工程实例用有限元强度折减法分析边坡的稳定性。根据实际勘察的工 程地质图，建立实例模型分析边坡的静力稳定性和动力响应。分析了地震荷载作 用下边坡加固措施，确定了抗滑桩的间距，排距，嵌入长度和布置位置。利用有 限元强度折减法，获得加固后地震边坡的动力响应。 关键词：边坡，地震，粘弹性边界，动力响应，抗滑桩 英文摘要 英文摘要 重庆大学硕 重庆大学硕士学位论文 III III PAGE PAGE IV ABSTRACT China is a seismic active country. Since last century many violent earthquakes had happened. According to the analysis on frequency and intensity of earthquakes occurred in recent decades, they which focused on Midwest zone of our country are in a increasing trend with shallow epicenter, huge strength and high frequency. Our country is also a mountainous country with many natural and artificial slopes especially in Southwest. Under the power of great earthquakes, these slopes may lost their stability which could cost heavy casualties and property loss. It has theoretical significance and great value in use, and some conclusions are obtained as follows: ① Stability of slope was analyzed by using ANSYS software and Strength Reduction Finite Element Method(FEM) was adopted to compute, also the safety factors of slope under static condition and seismic loads were determined. Effects of cohesive force and friction angle on stability of slopes were researched, also rules of relationship between strain and stress and distribution of displacements were found out. ②Stability of slope under seismic loads was analyzed based on the applying of viscoelastic boundary and the Strength Reduction FEM, during which dynamical safety factors were confirmed and also effects of cohesive force and frictio