基于小尺度数值模型的海底滑坡运动敏感性分析  

Sensitivity analysis of submarine landslide mass movement based on the small-scale numerical model

作　　者：修宗祥[1,2] 刘乐军[1] 解秋红[1] 李西双[1] 胡光海[1] 李家钢 赵强[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061 [2]海岸和近海工程国家重点实验室,辽宁大连116024 [3]中海油研究总院,北京100027

出　　处：《海洋通报》2016年第4期380-385,共6页Marine Science Bulletin

基　　金：国家自然科学基金青年基金项目(41206058);国家科技重大专项子课题(2011ZX05056-001-02);中央级公益性科研院所基本科研业务费专项资金项目(2013a25);大连理工大学海岸和近海工程国家重点实验室开放基金项目(LP1514)

摘　　要：开展海底滑坡运动特性研究是深水陆坡区滑坡地质灾害认识与防治的基础,建立了基于非牛顿流体欧拉-欧拉两相流理论的小尺度海底滑坡数值模型。在与实验数据和BING程序结果对比验证的基础上,模拟分析海底滑坡的一般运动规律及特性,并同无水条件下的滑坡模拟结果进行了对比。结果表明:环境水的存在可引发"滑水"现象,延长滑坡运动时间,增加运动距离,但端部最大峰值速度相对无水条件时较小;滑坡体物质组成、地形坡度、初始速度、初始厚度等因素,对最终的运动距离有较大的影响;滑坡体在运动过程中因扰动、混水而导致的屈服强度和粘滞系数的不断降低是海底滑坡长距离运动的主要原因。Study of submarine landslide movement characteristics is the basis for the understanding and prevention of the landslide geological hazard in the continental slope area.The small-scale numerical model of submarine landslide is established based on the Non-Newtonian Eulerian-Eulerian two-phase model.The validity of the established model is verified through the comparison with experiment data and the BING simulated result.The general movement behaviors of submarine landslide are then studied,and the simulated results are also compared with those without water.The result shows that the ambient water can lead the occurrence of hydroplaning phenomenon,which mainly can extend the running time of submarine landslide,and make a larger run-out distance.But the calculated maximum front peak velocity of submarine landslide is smaller than that without water.Soil composition,topographic slope,initial velocity and initial thickness play important roles in the submarine landslide run-out distance.The continuing decrease of yield strength and viscosity resulted by the soil disturbance and the incorporation of water during the movement process are the main reason for the larger run-out distance of submarine landslide.

关 键 词：海底滑坡 欧拉-欧拉两相流模型 Herschel-Bulkley模型 滑水 软化 

分 类 号：P694[天文地球—地质学]