Bedding-controlled coastal landslides in Southeast Britain between Axmouth and the Thames Estuary
Bedding-controlled coastal landslides in Southeast Britain between Axmouth and the Thames Estuary
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英国东南部阿克斯茅斯和泰晤士河口之间的层理控制的沿海山体滑坡
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
M. Ibsen
中科院分区：
文献类型：
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作者：
E. Bromhead;M. Ibsen
英国东南部的海岸线是由侏罗纪、白垩纪和第三纪的沉积岩形成的，这些沉积物中的大多数含有厚的泥岩层，其倾角非常低。当这些岩层适当暴露时，特别是在海岸斜坡的脚下，它们会引起滑坡，其中全部或部分滑动面沿着单一的泥岩床。当顺层的倾角很陡时，这种滑坡被称为倾斜斜坡破坏。然而，滑坡的基底滑动面是由一个单一的泥质层的位置和方向控制的序列更好地称为“层理控制”的滑坡。此外，在沿海斜坡包含几层泥岩的地方，可能会发生几何形状相似的滑坡，其中栖息的滑动面在斜坡内的较高水平处破裂。具有强烈层理控制的基底剪切面的滑坡是英国东南海岸线沿着不稳定的主要形式。本文中使用的许多个别滑坡案例已经分别研究了多年。不同的记录的一般相似性进行了讨论，绘制重要的推论，这些滑坡的一些方面与各种各样的基底滑动面的几何形状。
The coastline of Southeast Britain is formed in sedimentary rocks of Jurassic, Cretaceous and Tertiary age, the majority of these deposits containing thick strata of mudrocks, which have very low angles of dip. Where these strata are appropriately exposed, particularly at the foot of a coastal slope, they give rise to landslides where all or part of the sliding surface follows a single bed of mudrock. Where the dip of the bedding is steep, such landslides are referred to as dip-slope failures. However, landslides where the basal sliding surface is controlled by the location and orientation of a single argillaceous bed in the sequence are better termed ‘bedding-controlled’ landslides. In addition, where coastal slopes contain several layers of mudrocks, geometrically similar landslides may occur with perched slide surfaces breaking out at a higher level within the slopes. Landslides with strong bedding-controlled basal shear surfaces are the predominant form of instability along the southeast coastline of Britain. Many of the individual landslide cases used in this paper have been studied separately over many years. The general similarity of the different records is discussed, drawing important inferences on a number of aspects of these landslides with a variety of basal sliding surface geometries.