Failure Mechanism of Landslide with “squeezing-out” deformation
Failure Mechanism of Landslide with “squeezing-out” deformation
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“挤压”变形滑坡破坏机制
DOI：
10.3313/jls1964.27.4_1
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发表时间：
1991
期刊：
影响因子：
6.7
通讯作者：
T. Kamai
中科院分区：
文献类型：
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作者：
T. Kamai
nebu川站山体滑坡是由1923年的关东地震引发的。地质和岩土研究均指出，该滑坡在弱浮石层中剪切（压缩破坏）而迅速破坏，并伴有独特的“挤压-挤压”变形，即以块状熔岩流为主的上层沉降并将下伏的浮石层挤压至滑坡体前部，导致边坡先后垮塌。对滑坡的弹塑性有限元分析和简化的三层模型表明，“挤压-挤压”是边坡上常见的变形类型之一，它由薄的软弱夹层（如浮石）和缓倾斜（小于10度）的厚刚性层（如熔岩）组成。一些地质证据支持了“挤压-挤压”变形的滑坡发生在层状火山的解剖斜坡上，有时会导致岩屑的高速、长距离的径流；然后，这些将为防灾规划提供有用的基本信息。
The Nebukawa-station Landslide was triggered by the Kanto earthquake in 1923. Both geological and geotechnical studies point out that the landslide failed rapidly by shearing (compression failure) in the weak pumice layer which was accompanied with the unique deformation named “squeezing-out” that is, the upper layer, mainly massive lava flow, subsided and squeezed out the underlying pumice layer to the front of slide, and the slope collapsed successively.The elastic-plastic FEM analyses both on the landslide and the simplified three-layers model indicate that the “squeezing-out” is one of the common deformation type on slope which consists of thin weak intertrappean layer (e. g. pumice) and gentle dipping (less than 10 degree) thick rigid layers (e. g. lava).Several geologic evidences support the idea that the landslide with the “squeezing-out” deformation occurs in dissected slope of stratovolcano, and sometimes leads to the run-off of debris, high speed and long distance; these will then provide basic information useful for disaster prevention planning.