Modelling landslide liquefaction, mobility bifurcation and the dynamics of the 2014 Oso disaster
Modelling landslide liquefaction, mobility bifurcation and the dynamics of the 2014 Oso disaster
复制标题
DOI：
10.1680/jgeot.15.lm.004
复制
发表时间：
2016-02
期刊：
影响因子：
5.8
通讯作者：
R. M. Iverson;D. George
中科院分区：
文献类型：
--
作者：
R. M. Iverson;D. George
有些滑坡缓慢或间歇性地向山下移动，但另一些滑坡在运动的早期阶段就发生了滑坡，导致失控的加速度和高速跑过低起伏地形。负责这种不同的行为的机制表示在一个两阶段，深度集成，滑坡动力学模型，融合了土壤力学，颗粒力学和流体力学的原则。该模型假设，逐渐增加的孔隙水压力导致边坡破坏成核的最薄弱点上的一个静态平衡的质量的基础滑动面。然后，由于动量交换，故障扩散到相邻区域。液化是偶然的孔隙压力反馈，取决于初始土壤状态。这种反馈的重要性说明了使用该模型来研究的动态发生在Oso，华盛顿，美国，2014年3月22日的灾难性滑坡。事件的替代模拟揭示了滑坡流动性分叉的显著影响…
Some landslides move slowly or intermittently downslope, but others liquefy during the early stages of motion, leading to runaway acceleration and high-speed runout across low-relief terrain. Mechanisms responsible for this disparate behaviour are represented in a two-phase, depth-integrated, landslide dynamics model that melds principles from soil mechanics, granular mechanics and fluid mechanics. The model assumes that gradually increasing pore-water pressure causes slope failure to nucleate at the weakest point on a basal slip surface in a statically balanced mass. Failure then spreads to adjacent regions as a result of momentum exchange. Liquefaction is contingent on pore-pressure feedback that depends on the initial soil state. The importance of this feedback is illustrated by using the model to study the dynamics of a disastrous landslide that occurred near Oso, Washington, USA, on 22 March 2014. Alternative simulations of the event reveal the pronounced effects of a landslide mobility bifurcation t...