雲林縣坪頂村林北坑崩塌地治理對策之探討

The Study of Collapsed Land Management Strategies for Yunlin County Pingding Village Linbeikeng

陳靜嫻(Ching-Hsien Chen) ； 鄒宗穎(Tsung-Ying Tsou) ； 林俐玲(Li-Ling Lin)

《坡地防災學報》 6卷2期 (2007/09) Pp. 1-15

https://doi.org/10.29995/JSHR.200709.0001

摘要

坪頂村林北坑崩塌主要原因，係地表水經由透水性佳之礫石層，下滲至透水性極差之泥岩層上，累積之地下水使層面間水壓力升高，增加土體下滑驅動力；又泥岩層受地下水軟化，抗剪強度降低，促使邊坡產生崩塌，經年累月重複的作用，致崩崖不斷後退。綜合該區十幾年來治理失敗原因有以下：(1)施工位置著重在邊坡上方崩塌區，未考慮邊坡坡趾尚存不穩定狀態。(2)使用工法增加邊坡承載力，造成邊坡不穩定性的提升。(3)無整體治理概念，治理速度不及地形自然演變之崩塌速度，致再度發生崩塌時，既有設施併同損毀。崩塌地處理方法為消除地表水及地下水之誘因、增加邊坡基腳抵抗力及保護表土之植生等方法，工法正確使用、整體治理及災害管理觀念的建立，方是治理成功的關鍵。

關鍵字

坪頂村 ； 崩塌 ； 災害管理

並列摘要

The main cause of the collapse of Pingding Village Linbeikeng is that surface water permeates pervious gravel layer to poor pervious mudstone layer, and the accumulated underground water raises the inter-layer water pressure, increases the mud gliding force; also, the mudstone layer is softened by underground water, thus, the anti-shear strength decreases, and collapse of side slope is resulted. After years of effect, the collapsed cliff receded. The reasons of failure in collapsed land management include: (1) The construction locations are usually on the upper collapsed area of the side slope, and the side slop instability is often neglected. (2) The construction increases the carrying load of the side slop without improving the instability of the side slope. (3) Lack of overall management concept, the existing installations may be damaged. The collapsed land management strategies include eliminating causes of surface water and underground water, improving the resistance of side slope foundation, protecting vegetation on the surface soil, correct application of construction methods, establishing overall management and disaster prevention concepts.

並列關鍵字

Pingding village ； collapse ； disaster prevention