台灣山嶺集水區之工程地質特性與邊坡災害之相關性

The Relationship between the Characteristics of Engineering Geology and Slope Disasters around River Catchments of Taiwan

10.6562/JEE.2012.29.3

林冠瑋(Guan-Wei Lin)；陳宏宇(Hong-Yu Chen)；Hoe I. Ling

山崩 ； 岩石強度 ； 不連續面密度 ； 坡度 ； 坡向 ； Landslide ； Rock strength ； Discontinuity ； Slope degree ； Slope aspect

工程環境會刊

29期（2012 / 07 / 01）

43 - 58

繁體中文

本文利用了台灣島上13條主要河流集水區內之崩塌地的分佈概況，來探討集水區內的地質環境對於邊坡災害之影響。從地質材料特性方面可以得知，台灣島上之岩石強度由西往東有增強的趨勢。當集水區內的岩石強度越低，或不連續面越發達，該岩體越容易受到風化、侵蝕作用的影響，使得邊坡發生崩塌之機率較高。在地形條件方面，崩塌大多發生在坡度大於坡度機率分布尖峰值的坡體上；且台灣西部集水區的崩塌地主要是分布於東南向、南向，及西南向的坡體上，東部集水區的崩塌地則主要是分布於東南向及南向的坡體上。

Geological and landslide investigations in 13 river catchments of Taiwan provide the opportunity to achieve a better understanding of the impact of geological environment on geo-hazards in mountainous areas. The tests and measurements of geomaterial properties in the field exhibited that rock strength increased from the western region to the eastern region of Taiwan. Moreover, landslides were prone to occur in the catchments with relatively lower rock strength and higher joint density. In addition, most of landslides occurred on the slopes with slope values higher than the peak slope value of topographic slope probability distribution. In western Taiwan, landslides frequently occurred on the southeast-, south-, and southwest-facing hill slopes, and in eastern Taiwan, most of landslides occurred on the southeastand south-facing slopes.