和雅地區順向坡受地震影響滑動潛能分析

Potential Analysis of Herya Dip-Slope Landslide Induced by Earthquakes

林美聆(Meei-Ling Lin) ； 王國隆(Kuo-Lung Wang) ； 廖瑞堂(Jui-Tang Liao) ； 余炳盛(Bing-Sheng Yu) ； 王元度(Yung-Du Wang) ； 費立沅(Li-Yuan Fei) ； 紀宗吉(Tzong-Jyi Jih) ； 林錫宏(Shi-Hong Lin)

《中華水土保持學報》 42卷4期 (2011/12) Pp. 336-344

https://doi.org/10.29417/JCSWC.201112_42(4).0007

摘要

南投縣鹿谷鄉和雅地區深坑聚落於921地震後6年，當地居民於順向坡上方發現裂縫，研判係為受921地震作用所引起，裂縫最深處達數公尺，其中「六耕」裂縫長約80公尺。本研究針對和雅地區順向坡進行各項現地調查及資料收集，經由各項調查及分析，探討和雅順向坡受地震影響之滑動潛能，並驗證921地震對該順向坡滑動之影響。經由地質及鑽探調查與歷年航照判釋分析比對，推測和雅順向坡於深度60－65公尺處存在可能滑動面，此外，利用擬靜態分析探討可能滑動深度，由鑽探結果之破裂面位置約為60公尺，與分析結果可能滑動深度頗為一致。因此由各項分析結果可驗證該處順向坡具高滑動潛能。

關鍵字

和雅地區 ； 順向坡 ； 滑動潛勢 ； 地震作用 ； 擬靜態分析

並列摘要

Six years after the Chi-Chi Earthquake, severe cracks were found in the Herya dip-slope in the Senkern Community, Nantou County, and were postulated being induced by the Chi-Chi Earthquake. The crack in the Liougern area was several meters deep and 80m long. In this research, the potential of the Herya dip-slope landslide induced by earthquake was studied. Field investigations were conducted, and potential analysis was performed using pseudo-static procedures. The possible sliding surface identified from boring logs and topographic analysis was at about 60 meters deep, which appeared to be consistent with the results from pseudo-static analysis. Results of the study verified the high sliding potential of the Herya dip-slope subjected to a similar earthquake.

並列關鍵字

Herya area ； dip-slope ； landslide potential ； earthquake ； pseudo-static analysis