深層地滑邊坡運動歷程暨微地動特性案例研究

Evolution of a deep-seated creeping slope and associated characteristics: A case stud

羅百喬(Bai-Chiao Lo)

指導教授 ： 翁祖炘 ； 王泰典

國立臺北科技大學/工程學院/資源工程研究所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00675

摘要

深層地滑特徵為邊坡滑移範圍大、移動速率緩慢、短時間內不易察覺，一旦觸發條件發生致使邊坡滑移運動加速，極可能引發遽變式山崩，造成重大災難。如何確認深層地滑的存在、滑動的範圍等相關課題，為國內邊坡災害防治與保障居住安全的關鍵項目。
本研究主要透過我國東南部某深層地滑邊坡為研究案例，蒐集彙整研究區域既有調查與監測資料，判釋多期遙測影像，繼而透過現地查核、地表地質調查與監測的資料比對後，確認深層地滑之滑動邊界與深度，據以探討案例邊坡近50年的運動歷程及滑動影響因素。並根據確認的滑動邊界，於現地進行一系列的微地動測量作業，據以探討深層地滑的微地動特性，以及微地動測量應用於深層地滑相關研究之注意事項。
研究結果顯示，本研究區域深層滑動體主要有三個，最大地滑區內包含兩個次級的滑動體，其滑動深度分別約為90 m、50 m與30 m，各滑動體運動歷程受坡趾沖蝕、下游小規模崩塌、公路修築、雨量等因素影響。深層地滑微地動特性部分，滑動區岩土層受擾動後相對鬆軟，其微地動特性與滑動區外有顯著差異，即微地動測量可提供判釋深層地滑滑動範圍之參考

關鍵字

深層地滑 ； 運動歷程 ； 微地動量測

並列摘要

The deep-seated slope movement is the one characterized by a huge scope moving mass with a deep sliding surface, low displacement rate, or a connecting of several moving masses with deep sliding surfaces. The existence how to affirm the deep-seated slope is an important project of domestic side slope disaster prevention and control with sliding range.
A deep-seated slope movement case with many years monitoring data and 50 years of aerial photograph in southeast Taiwan, this article investigates the site characteristics of the slope. Borehole investigations, collecting monitoring and identification aerial photograph revealed the presence of unstably slope, which when integrated with inclinometer, image-mosaic technology detecting lining cracks and surface geodetic data, helped to provide key insights into the underlying instability mechanisms.
Surface and borehole investigations of the unstable mass reveal an up to 90 m deep of metamorphic rocks divided into three primary blocks. The result showed deep-seated slope tended to move towards toe of slope and discontinuity attitude .The different response of microseismic measurement can make a distinction of slip the region and outside.

並列關鍵字

Deep-seated Slope Gravitational Deformation ； Deformational evolution ； Microseismic

參考文獻

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