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INVESTIGATION OF CONSEQUENCE OF HYDROPLANING IN SUBMARINE LANDSLIDE
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摘要: 海底滑坡是危害最大的海洋地质灾害之一，可以沿海底斜坡搬运超大体积的沉积物，并作高速运动。滑水是海底滑坡高速和长距离滑动的主要原因，涉及复杂的滑坡体-环境水相互作用。本文采用新型数值方法物质点法对滑水的危害性进行研究，分别对室内试验和真实滑坡案例中滑坡体的运动过程进行了反分析。考虑滑水发生的力学条件，将上部流体拖曳阻力、底部海床阻力和滑水发生时的水垫层阻力共同作用于滑坡体，得到的滑坡体运动距离与试验和观测结果一致。分析了滑坡体在滑水发生后的动力特性，研究表明滑水大幅增强了海底滑坡的运动距离和滑动速度。Abstract: Submarine landslides are one of the most hazardous agents,through which vast volumes of sediments are transported across the slopes under very high velocities. Hydroplaning is attributed to be the main reason for the high mobility of the submarine landslide,in which complicated interactions between the sliding mass and the ambient water is involved. This paper investigates the consequences of the hydroplaning using a novel numerical tool,the material point method(MPM),simulating the runout process of a laboratory and a real case submarine landslide. Considering the mechanical properties on the sliding mass during the runout process,upper drag force,basal resistance,and resistance from the water cushion are imposed on the sliding mass. The obtained runout distances for the two scenarios agree well with the observations. Based on the further analysis of the mobility of the sliding masses,it is found that the hydroplaning effect significantly enhances the runout distance and maximum velocity.
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Key words:
- Submarine landslide /
- Runout /
- Material point method /
- Large deformation
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图 6 Finneidfjord滑坡地形图和沉积物抗剪强度(Ilstad et al., 2004a)
a. 滑坡区分为4个区域; b. 滑出块体不排水抗剪强度
Figure 6. Morphology and sediment strength in Finneidfjord slide(Ilstad et al., 2004a)
图 7 不同网格尺寸对滑动距离和滑动形态的影响
a. 网格尺寸0.25m(1000s); b. 网格尺寸0.125m(1000s)
Figure 7. Influence of mesh size on runout distance and morphology
图 8 滑水对滑坡体滑动距离和滑动形态的影响
a. 无滑水; b. 有滑水
Figure 8. Influence of hydroplaning on runout distance and morphology
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