The Topographic Effects on the Seismic Response of Slopes

• Main Authors: Shih-Ting Lan, 藍詩婷
• Other Authors: 林美聆
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/51488984192121855780

碩士 === 國立臺灣大學 === 土木工程學研究所 === 102 === Taiwan is located at the boundary between the Philippine Sea Plate and the Eurasian Plate which results in frequent orogenic activities and its dramatic mountain terrain. Two-thirds of the total area of Taiwan consists of mountains, uplands and hills and earthquake is the most frequent natural disasters in Taiwan. A great deal of historical seismic literature has shown that uneven terrain can produce expanding shock waves during an earthquake which may be the main reason for landslide hazard. Steep slopes or mountain tops are especially affected by the amplification of ground motion amplitude which can easily reach 5, 6 or even 10 times more. This research mainly uses results of the previous studies on large and small shaking table model test as well as numerical simulation to simulate the dynamic responses, deformation and displacement of slope-lands under the influence of seismic activities. Two main factors of the topographic effect including the slope height and angle, this research were analyzed and discussed. The simulation results show that the overall impact of soil layer thickness is more significant than the geometry of slope angles. Also the geometric shape of slopes has a more prominent impact when it approaches the shear strength of material, otherwise, the impact is rather insignificant compared to the effect of layer thickness. For the field case study, the geological environment profiles, geographical changes and seismic records of the Central Bureau Weather strong motion station in Sun-moon Lake, Nautou County and the strong motion station in Yuchi Elementary School were collected and analyzed. Although the geographical differences and various natural conditions lead to outcome different of shaking table results, the overall stimulation still indicates that the amplification effect is remarkable, and ground layer thickness has greater influence than the geometry of slope angles.