Assessment of seismic slope stability considering two-dimensional flexible block reaction and topographic amplification effect

• Main Authors: Chung-Han Lin, 林忠翰
• Other Authors: Chi-Chin Tsai
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/4b5uvs

碩士 === 國立中興大學 === 土木工程學系所 === 104 === The Newmark displacement method is a common method to assess seismic slope stability. However,it is assumed that the sliding block is rigid and doesn’t considering the topographic effect. The incident seismic wave will be varied depending on depth of sliding, shear wave velocity, and the frequency content of seismic wave. In addition, the motion will also be altered by seismic wave reflection in two-dimensional. Nevertheless, the analysis of topographic effect is quite complex. Therefore, the aim of this study is to a simple approximation to assess seismic slope acceleration considering topographic effect and geometry of slope to be conjunction with the Newmark displacement method. This study is divided into two parts. In the First part, different from the Newmark displacement method we consider the sliding block is flexible and use two-dimensional Finite Element Method to analyze the interaction of flexible block and input motion. In the second part, we focus on the seismic wave behavior and evaluate the topographic effect and it’s relation with geometry of slope. In this study we apply two different input motions, including single frequency and broadband motion. Then we find the relation of topographic effect and input motion, and establish a topographic amplification effect regression formula to simply estimate the acceleration on the slope for accurately assessing seismic slope stability.