北部濱海公路南雅里路段邊坡崩塌個案之研究

A case Study on the Nan-Ya Landslide along the North Coast Highway

黃鎮臺(Chen-Tair Huang) ； 夏龍源(Long-Yune Shiah)

《鑛冶：中國鑛冶工程學會會刊》 34卷4期 (1990/12) Pp. 89-94

https://doi.org/10.30069/MM.199012_34(4).0011

摘要

北部濱海公路南雅里路段於民國七十八年三月八日凌晨發生大崩塌。為了解崩塌發生的原因，並累積崩塌案例資料以備未來劃分潛在崩塌危險地區標準和做預先防治工作的參考而進行本個案研究。經蒐集相關資料與現場勘察、測量、取樣及簡易力學試驗研析後，從立體投影法與反算法（Back-Analysis）分析知本崩塌現場為平面破壞與楔型破壞組合之複合型破壞。發生崩塌的因素有：地勢陡峭與節理面形成之順向坡、延續性佳、節理面傾角大於其摩擦角而小於坡角及坡趾節理面透空引發上邊坡岩塊崩落。本文並提出本邊坡之處理建議：鬆動危石清除或岩錨固定或坡面覆以落石網等。

並列摘要

At dawn on the 8th March 1989, a rock fall ocurred in the Nan-Ya Section of the North Coast Highway. To understand the causs of the failure and to accumulate the information of the case for future reference in discrimination of the potential dangerous areas and the measures of preventive treatment, the study was proceeded. Based on the results of data collection, field investigation, survey, sampling, and back calculation analysis by stereographic method, the mode of failure is concluded as combination of plane failure and wedge failure. The controlling factors of the failure include steep slope, dip-slope formed by jointing, high persistence of discontiunities, daylight slope, low friction angle of the slope and free surface of the toe. The measures of treatment is suggested to clean up the loosen materials, fix by using anchor, or spread with protecting nets over the slope.