Displacement-Based Approach for Assessing Earthquake-Induced Shallow and Deep Slope Failures

• Main Authors: Yu-Chun Chien, 簡佑鈞
• Other Authors: 蔡祁欽
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/33667671400602230275

碩士 === 國立中興大學 === 土木工程學系所 === 103 === Newmark’s displacement method is a common method for slope stability analysis under seismic loading. Yielding acceleration (ky), defined as a threshold acceleration, is an important parameter for the analysis of slope stability in the Newmark’s displacement method. When the earthquake-induced acceleration exceeds the yielding acceleration, the slope begins to slip. Usually, the yield acceleration cannot be calculated directly but be obtained through an iterative analysis. The iterative calculation makes the Newnmak method time-consuming and costly, which results in a huge expense especially for a region-wide assessment. In order to enhance the effectiveness of the Newmark analysis, this study developed a simple method to assess earthquake-induced displacement. This study includes two main parts. The first part is, based on large amounts of data of slope stability analysis, to develop the relationship between the safety factor (FS) and the soil parameters and to define the relationship between the shape of failure and ky. By means of the developed relationships, we could directly calculate FS and ky based on soil parameters and slope geometry. The second part is to develop a prediction model for Newmark’s displacement using the data of Chi-Chi earthquake. In reality, the slope is a flexible block but it is assumed as a rigid block in Newmark’s method. Therefore, this study uses one-dimensional equivalent linear analysis to account for the influence of flexible slope on the incident motion and access how it modifies the rigid-displacement model. By combining the ky in the first part and the developed model in the second part, it is easily to predict the displacement of earthquake-induced shallow and deep slope failures.