摘要
梨山地滑區為過去曾發生大規模地盤滑動所形成之地區，其地質主要是由崩積層及破碎板岩所組成，主要地滑區可分成西、東南I、東南II及東北三個區域，每個地滑區並由數個上下相關連之滑動體所構成，滑動體呈角形或馬蹄形，其長寬近百公尺或數百公尺，滑動面深度在地表下30～60公尺內，屬於大面積之深層地盤滑動。由調查與監測結果發現，其上方覆蓋之崩積層及風化板岩層透水性佳，地表水易入滲而使地下水位上升，降低邊坡之穩定性，因此降雨時引起地下水位上升，推測為造成本區地滑災害的主要誘因。目前之整治方式為施以地表排水、橫向集水管、集水井、排水廊道等整治工程。本文針對現況及施工整治成果進行檢討與評估，並配合相關之研究成果來評定使用工程方法的成效。
並列摘要
In the past, a large-scale land sliding occurred in Li-Shan area. The geology of Li-Shan area is composed of colluvium and fractured slate. Master landslide is divided into west, southeast I, southeast II and northeast areas. Slideland is formed to angular and horseshoe shape, and it is more than one hundred meters in width and length, and 30-60 meter in depth underground. Because the crack of upper slideland is evident and colluvium is permeable, groundwater is the most likely cause for sliding of the upper layer of slope. The slideland movement is closely related to the rainfall and groundwater fluctuation. Infiltration of rain water is percolated from surface and wild crack is concluded as the main factor influence the stability of slideland. Now engineering operation is conducted using surface drainage, horizontal drainage pipes, drainage wells and drainage tunnel. It is estimated for effective and modified method, and proposed to form the criterion of slideland management.
被引用紀錄
延伸閱讀
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