嘉义县濑头区位崩塌因素初步探讨PreliminaryDiscussionofthe.PDF

嘉義縣瀨頭區位崩塌因素初步探討  (2) (3) (4) 馮正一 黃祥慶 黃志彰 賴琇瑩 摘 要 瀨頭崩塌地位於嘉義縣番路鄉阿里山地區，於民國 98 年莫拉克颱風來襲時傳出地滑、崩 塌之情形，目前 2012 年 5 月可能仍在緩慢潛移當中。莫拉克颱風帶來的強烈雨勢與瀨頭地區 砂頁岩互層與斷層通過之破碎地質，可能因而引發此次崩塌。其滑動痕跡亦可經由地表、植生 觀察來加以判定。本研究於瀨頭地區進行現勘及地表調查等，由觀察之現象與現況進行崩塌機 制之探討，並檢視地區地質等相關資訊，初步崩塌機制與地質條件之關聯性。瀨頭地區遭受崩 塌滑動之影響，使居民深受災害威脅，應盡速進行進一步細部調查及規劃，以有效預防減緩災 害的發生及相關損失。 關鍵字( ：瀨頭、崩塌、潛移、莫拉克) Preliminary Discussion of the Factors Causing Laitou Landslide in Jiayi, Taiwan Zheng-yi Feng(1) Hsiang-ching Huang(2) Jih-jang Huang(3) Hsiu-ying Lai(4) Professor(1) and Research Assistant(4) , Department of Soil and Water Conservation, National Chung Hsing University, Taichung, Taiwan.Geologist(2) , Tectonic Engineering Consultants Co., Ltd. 6F-1, No. 6, Zhong-Ke Road, Ta-Ya District, Taichung, Taiwan.Graduate student(3) , Department of Civil Engineering, National Ping-Tung University of Technology and Science, Ping-Tung, Taiwan. ABSTRACT Laitou landslide is located in Alishan area, Jiayi, Taiwan. The landslide occurred during Typhoon Morakot in Aug. 2009. The landslide body is still slowly creeping until now in May 2012 . The intense rainfall triggered the landslide during Typhoon Morakot. The weak geology due to fault and the sheared inter-bedded sandstone-shale formation shall be the intrinsic landslide cause. The landslide scarps can be observed by comparing topography and vegetation. This study performed a preliminary surface geological survey and discussed the factors caused the landslide at Laitou, Jiayi,                                                         國立中興大學水土保持學系教授 (通訊作者 e-mail ：tonyfeng@.tw) (2)泰坦工程技術顧問有限公司應用地質技師 (3)國立屏東科技大學土木工程系博士生 (4)國立中興大學水土保持學系專任助理 177 水土保持學報44(