921集集大地震相關的坡地災害、坡地破壞特性、與案例分析

Disasters, Characteristics, and Case Analysis of Slope Failures Caused by Chi-Chi Earthquake

洪如江(Ju-Jiang Hung) ； 林美聆(Meei-Ling Lin) ； 陳天健(Tien-Chien Chen) ； 王國隆(Kuo-Lung Wang)

《地工技術》 81期 (2000/10) Pp. 17-32

https://doi.org/10.30140/SG.200010.0002

摘要

921集集大地震對中部地區造成嚴重的坡地破壞，廖軒吾（2000），根據該地震前後的衛星（Spot）影像、航空照片、以及現場核對，得知該地震一共誘發了9272個面積大於625平方公尺的山崩，總面積約達127.8平方公里。林美聆、廖洪鈞與翁作新（Lin，Liao and Ueng，1999）之研究結果顯示：幾乎所有的坡地破壞都發生於車籠埔斷層之右（東）方。國家地震工程研究中心所支持的大地工程震災現地調查，確實掌握了中部山區436處坡地破壞的資料。本文研究針對這436處坡地破壞的特性作進一步分析，發現本次地震所導致的坡地破壞大都屬於中至小型規模的淺層岩屑滑崩，且其坡度大都較為陡峭，在地震所引致的坡地破壞中，地表運動可歸納為導致坡地破壞的最顯著因素。本文對四大坡地災害（草嶺大崩山、九份二山順向坡滑動、中部橫貫公路谷關德基段之全面崩潰、與九九峰之禿頭）加以討論。草嶺及九份二山的反算及穩定性分析也於本文之中一併探討。

關鍵字

921集集大地震 ； 坡地災害 ； 坡地破壞特性 ； 個案分析 ； 順向坡滑動

並列摘要

The Chi-Chi earthquake has caused extensive slope failures in central Taiwan. Liao (2000) pointed out that Chi-Chi earthquake caused about ten thousand landslides to the area, each of which is larger than 625 square meters and that the total area of the landslides exceeds a hundred square kilometers. In their paper on the geotechnical hazard caused by Chi-Chi Earthquake, Lin, Liao, and Ueng (1999) showed that almost all of the slope failure sites are located to the right (east) of Che-Lung-Pu fault. Based on 436 landslides investigated by professors and experts in the field of Geotechnical Engineering, the characteristics of slope failure for these landslides are analyzed. The analysis reveals that most of the landslides induced by the earthquake were small to medium size and were typically shallow debris slides of steep slopes. For the earthquake-induced landslides, ground motion is thought to be the most significant factor.Among all the landslides triggered by Chi-Chi earthquake, the most catastrophic and dramatic four will be discussed in greater detail. These are: Tsao-Ling rockslides, Juo-Feng-Err-Shan dip slope failure, stripping of Juo-Juo-Fong (99 peaks), and the Ku-Kuan to Te-Chi section (mileage 34K to 62K) of the Central Cross-Island Highway.Case study on the Tsao-Ling rockslides and the Juo-Feng-Err-Shan dip slope failure was also conducted.

並列關鍵字

921 Chi-Chi earthquake ； disasters ； Characteristics of slope failure ； case analysis ； dip slope failure