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首页> 外文期刊>Bulletin of engineering geology and the environment >Predisposing factors and the mechanisms of rainfall-induced slope movements in Ugwueme, South-East Nigeria
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Predisposing factors and the mechanisms of rainfall-induced slope movements in Ugwueme, South-East Nigeria

机译：尼日利亚东南部Ugwueme降雨诱发斜坡运动的诱因和机制

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摘要

This research investigated the initiation and mobility of several landslides triggered by the 18-19 August 2008 rainfall in the Ugwueme area of Enugu State, Nigeria using a combination of field survey, satellite imagery and laboratory analyses. Among the landslides was a soil-slip slide that developed on a steep slope at the weathered sandstone-shale interface. While the mass movement (500 m in width) generated about 20,000 m(3) which was displaced for about 50 m downslope, an adjacent, simultaneously-triggered slide of nearly equal width was subject to only a few meters displacement; these events provided valuable information on the conditions conducive to their occurrence and mobility. The weathered mass failed primarily due to the steep slopes located near fault planes and several slope faces hanging over the valley along joints, and the pore-water pressure buildup due to sustained, intense rainfall in the preceding days. A number of large scale fractures occurred around the landslides location. One of the fractures, an approximately N-S trending fault was observed to be closely associated with the failures. A major stream/river channel was observed to have terminated < 2 km south of the landslide location. Whereas this stream may not have directly interfered with the failure site, a narrow tributary might have taken advantage of the fault plane to terminate at the point of failure. There was satisfactory agreement among the resulting maps, structural location data and field observations.
机译：这项研究结合了实地调查，卫星图像和实验室分析，调查了由尼日利亚Enugu州Ugwueme地区2008年8月18日至19日降雨引发的几处滑坡的形成和活动性。滑坡中有一个滑坡，在风化的砂岩-页岩界面处形成了一个陡坡。虽然质量运动（宽度为500 m）产生了大约20,000 m（3），并向下倾斜了约50 m，但相邻的同时触发的宽度几乎相等的滑动仅发生了几米的位移。这些事件提供了有助于其发生和流动的条件的有价值的信息。风化的块体破裂主要是由于位于断层平面附近的陡坡和沿节理处悬在山谷上方的多个斜坡面，以及由于前几天持续的强降雨造成的孔隙水压力的增加。在滑坡位置附近发生了许多大规模的裂缝。观察到其中一个裂缝是一个近似N-S趋势断层，与断层密切相关。观察到一条主要的河道/河道在滑坡位置以南2公里处终止。尽管该水流可能没有直接干扰故障部位，但狭窄的支流可能已经利用断层平面在故障点处终止。生成的地图，结构位置数据和现场观察结果之间令人满意地达成了一致。

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