本研究主要有兩個研究項目:一、利用鋼釘監測網與單頻GPS觀測南橫公路里程數164K+82~164K+133(摩天地區)之潛在大規模崩塌的活動性，瞭解潛在大規模崩塌的活動行為，以及降雨與坡面滑動間的關係；二、透過無人飛行載具輔助拍攝南橫公路里程數174K+155~174K+405(利稻地區)與里程數179K+355~179K+425(霧鹿地區)兩路段邊坡，將人力不易抵達處裸露岩層之弱面結合Coltop3D軟體進行不連續面位態分析，經野外不連續面特性查核後，利用赤平投影法探討邊坡破壞類型與可能的滑動方向分析。
摩天地區之潛在大規模崩塌地表位移量觀測成果顯示，鋼釘監測網部分，各裂縫在水平方向皆有擴張的趨勢；在垂直方向皆有向下沉陷的趨勢；部分裂縫有造成一側牆體向外推移的情形。單頻GPS觀測位移成果顯示，崩塌滑動體最大位移方向朝向東南方320.39毫米；向下沉陷161.51毫米。結合雨量資料顯示，當降雨事件的累計降雨量超過300毫米或降雨事件中日降雨量超過200毫米時，摩天地區之潛在大規模崩塌會產生明顯活動，造成人工建物之裂縫擴張程度加劇與單頻GPS觀測站明顯位移變化。
致災邊坡不連續面分析成果顯示，Coltop3D應用於裸露岩體區域之不連續面位態分析，可以良好的呈現不連續面的位態與其分佈位置，並與野外量測成果相吻合。南橫公路里程數174K+155~174K+405之邊坡，可能產生2種邊坡破壞類型，分別為(1)受控於解壓節理影響產生平面型破壞，滑動方向為方向角177°；(2)受控於解壓節理與節理面J1影響產生楔型破壞，滑動方向為方向角230°；與受控於解壓節理與劈理面產生楔型破壞，滑動方向為方向角105°。里程數179K+355~179K+425之邊坡受控於節理面影響可能產生傾覆型破壞，崩落方向為方向角44°。

This research has two principal parts. First, using nail networks and single-frequency GPS observe the potential large-scale landslide activity from kilometer markers 164K+82 to 164K+133 of the Motain area Southern Cross Highway to realize the potential large-scale landslide activity as well as the relationship between rainfall and slope sliding. Secondly, the study makes use of unmanned aerial vehicles to survey exposed rock formations not easily accessible by humans along two sections of the Highway: kilometer markers 174K+155 to 174K+405 and 179K+355 to 179K+425. Coltop3D software performs structural analysis of topography using point cloud. The stereographic projection method was used to analyze the slope failure type and describe possible slide direction.
The displacement observation results of a potential large-scale landslide in the Motain area show that all crack tends to expand in the horizontal direction and downward in the vertical direction according to nail network analysis on the slope. Some cracks cause one side of the wall to move outward. According to the GPS observative results, the maximum horizontal displacement of the slope sliding was 320.39 mm to the southeast. The amount of vertical displacement was 161.51 mm. Combined with the rainfall data, when the cumulative rainfall of the rainfall event exceeds 300 mm or the rainfall of the day exceeds 200 mm during the event, the potential large-scale landslide in the Motain area has caused obvious activities. Obvious activities intensify the degree of fissure expansion of the artificial structure and cause obvious displacement in the GPS observation station.
Regarding the analysis of the discontinuities of the disaster-causing slope, Coltop3D analysis of the discontinuous surface in the area of exposed rock mass well presents discontinuities and distribution positions consistent with the field measurement results. Two possible types of slope failure were identified in the analysis of the discontinuous of the disaster-causing slope between kilometer markers 174K+155 to 174K+405. 1. Planar-type failure is expected along with the release joint with an anticipated sliding direction of 177 degrees; 2. Wedge-shaped failure is expected intersecting the release joint and joint, J1, with an anticipated sliding direction of 230 degrees, with the additional risk of Wedge-shaped failure from release joint and cleavage intersections at an anticipated sliding direction of 105 degrees. In the analysis of disaster-causing slope between kilometer markers 179K+355 to 179K+425 of the Southern Cross Highway, Overturning failure is expected, governed by the influence of the Joint, with an anticipated sliding direction of 44 degrees.

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