地震触发海底滑坡流动运移规律的试验研究

项目名称： 地震触发海底滑坡流动运移规律的试验研究

项目编号： No.41502322

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 张敏

作者单位： 吉林大学

项目金额： 19万元

中文摘要： 海底滑坡是一种极具破坏力的海洋地质灾害，地震是其最主要的一个触发因素。在我国海洋油气资源加速开发的背景下，地震触发海底滑坡将对海上油气资源勘探开发的安全构成巨大的威胁，对地震触发海底滑坡流动运移规律的研究已成为国家海洋工程安全领域的重大战略需求。本项目针对地震触发的海底土质滑坡，从土体及滑坡体两个尺度，采用环剪试验和动三轴试验，研究地震作用下海底土体的强度衰减规律和非牛顿流体特性,揭示海底土体的流动特性及地震强度和粘粒含量对流动特性的影响；采用振动台-水槽试验，研究地震作用下海底滑坡体的运动过程及滑坡形态特征，揭示海底滑坡的运移特征及地震强度和粘粒含量对运移特征的影响；通过分析海底滑坡的流动特性及运移特征，揭示地震触发海底滑坡的流动运移规律。研究成果可有效促进海洋地质工程学科的发展，为地震触发海底滑坡灾害的防治提供科学的理论依据，对提高我国海洋工程地质安全性具有重要的理论意义和工程价值。

中文关键词： 海底滑坡；地震；动力学特性；流态化特征；振动台试验

英文摘要： Submarine landslide is a kind of extremely destructive marine geological hazard, and earthquake is an important trigging factor of it. Under the background of accelerating exploration the resources of China's offshore oil and gas, earthquake triggered submarine landslides will cause a huge threat to the security for the exploration and development of offshore oil and gas resources. Therefore, the research on migration law of earthquake triggered submarine landslide will be a major strategic need of the maritime safety engineering. The project takes submarine soil landslide, which is under the effect of earthquake, as the research object. First, using the ring-shear test and dynamic triaxial test to study the strength decaying law and non-Newton liquid feature of submarine soil, the flow characteristic and seismic intensity and clay content impact on flow characteristic will be studied. Second, using shaking table and flume to simulate the moving process and morphological characteristics of submarine landslides under the effect of the earthquake, the migration characteristics and the seismic intensity and clay content impact on the migration characteristics will be studied. Third, comprehensive analysis of the result, the migration law of earthquake triggered submarine landslide will be pointed out. The research results can effectively improve the subject of Marine Geology Engineering, and provide a scientific theoretical foundation for earthquake triggered submarine landslide prevention. This research will be a great value work and has an important theoretical significance for the safety of our marine engineering geology.

英文关键词： submarine landslide;earthquake;dynamic characteristic ;fluidization characteristic;shaking table test