台北盆地液化潛能區劃研究

• Main Authors: TAI, CHIN-CHUN, 戴志君
• Other Authors: 林美聆
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/29155576757469944843

碩士 === 國立臺灣大學 === 土木工程學研究所 === 91 === Taiwan is located on the central west of the circum-Pacific seismic belt. Due to the compression effect of the Philippine and Eurasian Plates, earthquake is a frequent phenomenon in Taiwan； the Chi-Chi Earthquake on September 21, 1999 caused serious soil liquefaction in the central areas. Considering the political and economic importance of the Taipei basin, as well as its population and building density, the liquefaction pontential of the Basin is of vital importance. The geological formation of Taipei basin are consisted of formations from the Quaternary Period, with high groundwater level, therefore, it is prone to soil liquefaction potential. The liquefaction pontential assessment could be performed based on the borehole data from field investigation. A Level-3 analysis of soil liquefaction could be conducted. However, it is unlikely that drilling data are to be uniformly spread over the entire area with good density, consequently, the liquefaction pontential for area without borehole data could not be determined. Thus an overall illustration based on borehole data of soil liquefaction in the Taipei basin is not available. In this research, the three-stage liquefaction analysis were performed separately. The first stage analysis utilizes the longest-distance criteria of the earthquake scale to define the coverage of liquefaction, and the liquefaction potential of Taipei basin was determined. The second stage involves different topographic modules of Taipei basin in different geological periods, and the high, medium, and low liquefaction sensitivity areas are determined using the “evaluation standards for the liquefaction potential of the geological topographic modules.” The third stage of the liquefaction analysis involves collection of effective borehole data for liquefaction pontential analysis, and the database was created. The liquefaction analyzing method was evaluated and selected along with magnitude of the earthquake and peak ground acceleration and distribution of the liquefaction potential for all areas in the Taipei basin was computed accordingly. Finally, the liquefaction sensitivity classification in the second stage and the distribution of the liquefaction potential index in the third stage are combined for discussion, and a complete framework of soil liquefaction zonation in the Taipei basin is achieved.