The Interpretation for Landslide Mechanism and The Proposal of Landslide Countermeasures in Abay Gorge in Ethiopia
The Interpretation for Landslide Mechanism and The Proposal of Landslide Countermeasures in Abay Gorge in Ethiopia
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DOI：
10.1007/978-3-642-32238-9_42
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Masao Yamada;Kensuke Ichikawa;Takeshi Kuwano;Tomonari Takeuchi;Atsushi Nakagawa
中科院分区：
文献类型：
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作者：
Masao Yamada;Kensuke Ichikawa;Takeshi Kuwano;Tomonari Takeuchi;Atsushi Nakagawa
3号主干道是埃塞俄比亚的一条主干道，穿过阿巴伊峡谷，全长近1500米，全长40多公里。在6月至9月的雨季，它经常受到山体滑坡的困扰。特别是L/S00、L/S05、L/S22、L/S27、L/S28分，路面损坏较大。在这些地区开展了钻井测量、电测深、地震勘探、钻孔伸缩仪、钻孔倾斜仪、地下水位计等各种调查和运动观测。虽然许多滑坡是堆积体滑坡，但软弱凝灰岩层与滑坡运动有关。从降雨、地下水位与滑坡变形的关系来看，连续降雨4天以上才能引起地下水位上升和滑坡变形。实际有效降雨后水位上升的时间间隔为1天，水位上升到滑坡变形的时间间隔为2天。本文介绍了一个全面的调查分析项目的结果，该项目进行了各种调查观测和JICA牵头的关于海外滑坡的综合分析。通过这些调查和滑坡运动观测成果，弄清了阿巴依峡谷滑坡的水文地质结构，对阿巴依峡谷的滑坡机理进行了解释，并提出了滑坡防治建议。
Main road 3, a major arterial road in Ethiopia, that passes through the Abay Gorge steeply climbs nearly 1,500 m over 40 km. It is plagued by landslides in the rainy season from June to September. Especially, the road receives big damages in L/S00, L/S05, L/S22, L/S27, and L/S28 points. The various investigation and movement observation of drilling survey, electric soundings, seismic exploration, borehole extensometer, borehole inclinometer, groundwater level meter and so on were executed in these districts. Though a lot of landslides are colluvial deposit slides, weak tuff layers are related to landslide movement. For the relationship between rainfall, groundwater level and landslide deformation, a continuous rainfall for at least four days is necessary to cause the groundwater level rising and landslide deformation. Also the time lag for water level rising after the practical effective rainfall is one day, and the time lag between water level rising and landslide deformation is two days. This paper introduces results of a full-scale investigation analysis project that executes various investigational observations and the integrated analyses lead by JICA concerning overseas landslides. Because the hydro-geological structure of landslides in Abay Gorge has been clarified from these results of investigation and landslide movement observations, the interpretation for landslide mechanism and the proposal of landslide countermeasures in Abay Gorge is shown in this paper.