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针对苏门答腊岛西北海域大型海底滑坡,建立基于欧拉-欧拉多相流理论的滑坡模型,对滑坡体动态运动过程开展模拟反分析。通过与BING程序和解析模型结果对比,考虑土体分段软化后的多相流模型能够较好的重现该滑坡体的运动过程,能获得与实际海底滑坡相近的沉积形态和滑动距离。分析结果表明滑动首先从坡角较大处开始,并逐渐推动中、前部坡度较小处土体滑动;滑坡体整体启动后沿斜坡逐渐加速,当滑动至斜坡底部时端部峰值速度达到最大值43 m/s,之后逐渐减速并在深海平原处停止运动;土体扰动以及混水后土体强度降低是海底滑坡长距离运移的根本原因,同时滑动过程中滑坡体端部发生的滑水效应,减小了海床摩擦力的影响,增加了滑坡体的运动距离。
Aiming at the large-scale undersea landslide in the northwestern Sumatra Island, a landslide model based on the Eulerian-Euler phase flow theory is established to simulate the dynamic movement of the landslide. By comparing with the results of BING program and analytical model, considering the multiphase flow model of subgrade soil softening can well reproduce the movement process of the landslide body and obtain the sedimentary form and sliding distance similar to the actual submarine landslide. The results show that the sliding begins with the larger slope angle and gradually pushes the soil slide with the smaller slope in the front and the front. When the slope landslides are gradually accelerated along the slope, the peak velocity reaches the maximum when the slope slides to the bottom of the slope Value of 43 m / s, and then gradually decelerated and stopped moving in the deep-sea plain. The disturbance of soil mass and the decrease of soil strength after mixed-water are the fundamental reasons for the long-distance migration of seabed landslides. At the same time, Water effect, reducing the friction of the seafloor, increasing the movement of landslide body distance.