Basal sliding and plastic deformation of a slow, reactivated landslide in New Zealand
Basal sliding and plastic deformation of a slow, reactivated landslide in New Zealand
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DOI：
10.1016/j.enggeo.2016.04.016
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发表时间：
2016-06
影响因子：
7.4
通讯作者：
C. Massey;D. Petley;M. McSaveney;G. Archibald
中科院分区：
文献类型：
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作者：
C. Massey;D. Petley;M. McSaveney;G. Archibald
Taihape滑坡是新西兰北岛中部的一个大型深层平移岩滑，是该地区晚第三纪沉积物中7000多个大型滑坡之一。本研究采用高时间分辨率、高精度的监测技术研究了其运动模式，并探讨了运动与触发机制之间的关系。在30年的监测期间，移动总是非常缓慢，但由于同时发生的基底滑动、内部塑性变形和季节性土壤收缩和膨胀，移动时快时慢。研究结果表明，运动速率不受孔隙水压力或其他监测参数的控制。更快速的运动的间隔出现在脚趾侵蚀，解除支持的滑坡体，其中的一个例子发生在2004年2月的洪水后，有一个重现期约100 years.的高时空频率的监测和测量精度的仪器允许新的见解到复杂的运动模式的深层次，缓慢移动的岩石滑坡。这里观察到的运动模式，以及所描述的收集和分析数据的技术，适用于许多缓慢移动的滑坡在新西兰，并在世界各地的类似环境中发生。
The Taihape landslide is a large, deep-seated, translational rockslide in central North Island of New Zealand, one of over 7000 large landslides mapped in the late Neogene deposits of this area. This study examined its patterns of movement using high temporal resolution, high-precision monitoring and explored the relationships between the movement and triggering mechanisms. During the 30-year monitoring period, movement was always extremely slow, but included periods of faster and slower motion due to a combination of simultaneous basal sliding, internal plastic deformation and seasonal soil shrinkage and swelling. The data suggested that movement rate was not controlled by pore-water pressure or any other monitored parameter. Intervals of more rapid movement appear to follow toe erosion that debuttress the landslide mass, an example of which occurred following a flood in February 2004 that had a return period of about 100 years.The high-temporal and spatial frequency of the monitoring and the measurement precision of the instruments have allowed new insights into the complex movement patterns of deep-seated, slow moving rockslides. The patterns of movement observed here, and the techniques described to collect and analyse the data, are applicable to many slowly moving landslides in New Zealand, and to those occurring in similar environments worldwide.