山棕寮地區北側溝整治工程之成效探討

Evaluating the Effect of North Side Ditch Control Works in Shanchonliao Landslide Area

許中立(Chung-Li Hsu) ； 徐弘明(Hong-Min Shu) ； 李哲宇(Zhe-Yu Lee) ； 林志賢(Chih-Hsien Lin) ； 張清晏(Ching-Yen Chang) ； 鍾庫比亞(Bi-Ya Chung Ku)

《坡地防災學報》 19卷2期 (2020/12) Pp. 1-9

摘要

山棕寮地滑地位於台東縣池上鄉於民國89年發生大面積地層滑動，造成當地許多建築物遭擠壓破壞與道路中斷，初期整治工程經歷了十多年的時間，部份設施已損毀功能喪失，因此於民國105年再度進行北側溝整治工程，使坡面逕流能順利排出至他處，不對坡面掏刷使土體不穩定導致地層滑動。本研究利用多年山棕寮地區之孔內傾度管監測資料分析山棕寮地區進行北側溝整治工程前、後的滑動情形，進而評估整治工程是否發揮工程成效。從資料分析結果可得知，工程施設前之104年度各孔位位移量較大，完工後之105年度雨量雖較大但孔位BH101-1位移量無上升並且下降，106年與107年觀測位移量均大幅下降，甚至位移量達工程施設前約五分之一左右，代表北側溝整治工程施設後有發揮其排水效果，並且效果顯著，使整體地滑地之滑移趨於穩定的情形。

關鍵字

地滑地 ； 排水溝 ； 觀測 ； 整治成效

並列摘要

Shanchonliao landslide area located at Chishang Township, Pingtung County, had occurred disasters of deep-seated landslide in 2000, which caused slope land destroyed, many houses and roads damaged. Although the government departments actively participated in the reconstruction work after the disaster, they had been unable to control the sliding trend due to local terrain sliding or improper construction and excavation methods. Even after the initial renovation project has gone through more than ten years, some of the facilities have been damaged and their functions have been lost. Until 2016, the north side ditch remediation project of control work was resumed, so that the slope runoff can be smoothly discharged to the downstream, and the slope flushing is controlled, so that the overall instability is improved. In this study, we used the monitoring data of the in-hole inclination pipe of the mountain brown shoal to analyze the sliding situation before and after the north side ditch remediation project in the mountain brown shoal area, and then evaluate whether the remediation project has achieved control work results. The analysis results show that the displacement of each hole in 2015 is quite large before the implementation of the control work project. Although there was still displacement in the 2016 rainy season after completion, the displacement of adjacent representative hole BH101-1 did not increase, and continuous observation in 2017 and 2018 the displacement were more drastically reduced, and even the displacement was about 1/5 of that before the project. This means that after the north side ditch remediation project was implemented, the drainage effect was exerted, and the sliding of the overall slippery land tends to be stable.

並列關鍵字

Landslide area ； Ditch ； Monitoring ； Remediation effect