Elements of an Improved Model of Debris-flow Motion

被引:0
作者
Iverson, Richard M. [1 ]
机构
[1] US Geol Survey, Cascades Volcano Observ, Vancouver, WA 98683 USA
来源
POWDERS AND GRAINS 2009 | 2009年 / 1145卷
关键词
debris flow; landslide; granular; mixture; pore pressure; dilatancy; soil mechanics; mathematical model; RUNOUT;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A new depth-averaged model of debris-flow motion describes simultaneous evolution of flow velocity and depth, solid and fluid volume fractions, and pore-fluid pressure. Non-hydrostatic pore-fluid pressure is produced by dilatancy, a state-dependent property that links the depth-averaged shear rate and volumetric strain rate of the granular phase. Pore-pressure changes caused by shearing allow the model to exhibit rate-dependent flow resistance, despite the fact that the basal shear traction involves only rate-independent Coulomb friction. An analytical solution of simplified model equations shows that the onset of downslope motion can be accelerated or retarded by pore-pressure change, contingent on whether dilatancy is positive or negative. A different analytical solution shows that such effects will likely be muted if downslope motion continues long enough, because dilatancy then evolves toward zero, and volume fractions and pore pressure concurrently evolve toward steady states.
引用
收藏
页码:9 / 16
页数:8
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