高屏溪流域大規模岩體滑動特徵與類型調查

Topographic features and failure mode of massive rockslide in Kao-ping River Basin

李宗聯(Zong-Ling Li)

指導教授 ： 陳天健

國立屏東科技大學/工學院/水土保持系所/碩士(2014年)

https://doi.org/10.6346/NPUST.2014.00261

摘要

本研究以臺灣南部高屏溪流域為研究區域，選定莫拉克風災後發生大規模岩體滑動案例及具有岩體深層滑動潛勢地共100筆，經由現地調查24筆與地形曲率分析發現，大規模岩體滑動地因長期重力作用下，局部地形產生潛變，且大部分崩塌地形剖面若非明顯凸起、即有明顯凹入，顯示崩塌坡體為漸進式的變形乃至破壞；另外進行大規模岩體滑動類型分類，發現大規模岩體滑動主要多發生於順向坡，其破壞類型多為單塊體破壞，運動模式急遽式破壞與漸進式破壞所佔比例大約相同，而滑動形狀多以平面型滑動為主。並進一步將其破壞型態、運動模式及滑動形狀與邊坡類型進行探討，以分類大規模岩體滑動之類型。另於現地調查發現於順向坡比較有潛變構造存在，其主要多發生於山腹之位置，而較小型崩塌則發生於靠近坡趾處。

關鍵字

岩體滑動 ； 潛變 ； 現地調查 ； 地形曲率 ； 邊坡類型

並列摘要

Focusing on the deep seated landslides by 2009 Typhoon Morakot in Kaoping river basin, a total of 100 deep-seated landslides were surveyed and 24 field investigations were preforms to find out the failure mode and natures. We discovered that creeps of deep-seated (DS) landslides occurred in the rock mass due to the long-term effect of gravity, most terrain profiles of DS landslides have been obviously convex or concave before they slid, this phenomenon suggests that the slope of DS landslide exhibits progressive deformation before failure. Moreover, classifying the large-scale DS landslides, large-scale DS landslides are found occurred frequently in dip slope which acted more in a single block sliding on translation plane. It also demonstrates that the proportion of movement patterns, rapid and progressive, of the DS landslide in study area is about the same. From field investigation, the creep structure are found more in the dip slope which occurred mainly in the hillside, while smaller DS landslides occurred on the foot of slope.

並列關鍵字

deep seated landslide ； creep ； field investigation ； terrain curvatures ； slope type

參考文獻

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