Development of Taprang landslide, West Nepal
Development of Taprang landslide, West Nepal
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DOI：
10.1007/s10346-016-0752-0
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发表时间：
2017-06
期刊：
影响因子：
6.7
通讯作者：
Amar Deep Regmi;Kohki Yoshida;P. Cui;N. Hatano
中科院分区：
文献类型：
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作者：
Amar Deep Regmi;Kohki Yoshida;P. Cui;N. Hatano
本文介绍的是位于尼泊尔喜马拉雅山西部马迪河右岸塔普朗的一次大型山体滑坡。它试图重建滑坡从初始状态到目前状况的演变过程。许多大型山体滑坡在不同时期经历了多次破坏事件才达到目前的规模和形状。 Taprang 山体滑坡也已经活跃了 75 年多，并经历了多次失败事件。该滑坡位于非常复杂的地质环境中，其特征是存在主中央逆冲断层和一些其他褶皱以及多个节理组和剪切带。它是在风化石墨片岩、高度破碎和节理石英岩、大理石、片麻岩和一些角闪岩上发育的。滑坡测绘显示岩石变形和破裂。它们也经历了强烈的风化。对滑坡及周边地区采集的岩石和土壤样品的实验室分析表明，风化岩石、节理填充物和剪切带富含粘土矿物，特别是具有膨胀特性的蒙脱石和蒙脱石。此外，长期以来水文、气候和人为因素同时作用，也对滑坡的扩大起到了重要作用。研究表明，滑坡未来很有可能向上坡扩大。
This paper is about a large landslide located at Taprang, on the right bank of the Madi River in the west Nepal Himalaya. It attempts to reconstruct the evolution of the landslide from its initial state to the present conditions. Many large landslides involve multiple failure incidents in different times to attain their present size and shape. The Taprang landslide has also been active for more than 75 years and experienced many failure episodes. The slide lies in a very complex geological setting characterized by the presence of Main Central Thrust and some other folds as well as several joint sets and shear zones. It is developed on weathered graphitic schists, highly fractured and jointed quartzites, marbles, gneisses, and a few amphibolites. Landslide mapping revealed that the rocks are deformed and fractured. They have also undergone intense weathering. Laboratory analysis of rock and soil samples collected from the landslide and surrounding area shows that the weathered rocks, joint infillings, and shear zones are rich in clay minerals, especially smectite and montmorillonite having swelling properties. Besides, hydrologic, climatic, and anthropogenic factors operating simultaneously since a long time have also contributed significantly to the enlargement of the slide. The study indicates that the landslide has a high potential of future enlargement towards upper slopes.