珠江口盆地海底滑坡发育特征及成因机制

发布时间：2018-04-15 10:36

本文选题：珠江口盆地 + 海底滑坡　；参考：《海洋通报》2017年01期

【摘要】：海底滑坡属于海洋地质灾害的一种主要类型。国内外海洋领域学者对不同地理位置的海底滑坡做过一些建设性的研究工作,国内学者在南海北部海底滑坡的研究中主要关注的是灾害分区和成因分析,而对南海北部珠江口盆地海底滑坡的形态、类型、规模、分布特征等方面的基础性工作还缺乏系统的科学分析。通过2012年以来对珠江口盆地滑坡区海洋土的静力触探试验、十字板剪切试验及室内分析试验,揭示出珠江口盆地海洋土的垂直分布特征,根据不同深度海洋土的工程性质差异可将该区土体自上而下划分为5层。按照海底滑坡所处的地貌单元不同,把珠江口盆地水深160~1280 m范围内发育的滑坡分为4处规模较大的滑坡带,均呈NE-NEE向展布,主要为顺层型滑坡、圆弧型滑坡和崩塌型滑坡3种基本类型,规模从4 km2到800 km2不等,集中分布在北纬19°-22°,东经113°-117°范围内。通过海底地质环境、水文气象环境及力学平衡分析,指出了影响海底滑坡稳定性的主要因素包括地震活动、海流影响及沉积物质的快速堆积3个方面。
[Abstract]:Submarine landslide is one of the main types of marine geological hazards.Domestic and foreign marine scholars have done some constructive research work on submarine landslides with different geographical locations. In the study of submarine landslides in the northern part of the South China Sea, domestic scholars are mainly concerned with disaster zoning and cause analysis.However, there is no systematic scientific analysis on the basic work of the submarine landslide in the Pearl River mouth basin in the northern part of the South China Sea in terms of its shape, type, scale and distribution characteristics.Through static penetration test, cross plate shear test and laboratory analysis test of marine soil in landslide area of Pearl River mouth Basin since 2012, the vertical distribution characteristics of marine soil in Pearl River mouth Basin are revealed.According to the difference of engineering properties of marine soil of different depth, the soil in this area can be divided into five layers from top to bottom.According to the different geomorphological units of submarine landslides, the landslides developed within the water depth of 160 ~ 1280 m in the Pearl River mouth Basin are divided into four large scale landslide zones, all of which are distributed in the NE-NEE direction, mainly in the bedding type.There are three basic types of arc landslide and collapse landslide, ranging in size from 4 km2 to 800 km2 and distributed in the range of 19 掳-22 掳north latitude and 113 掳-117 掳east longitude.Through the analysis of submarine geological environment, hydrometeorological environment and mechanical balance, it is pointed out that the main factors affecting the stability of submarine landslide include seismic activity, current effect and rapid accumulation of sedimentary material.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;天津大学岩土工程研究所;华北理工大学;
【基金】：国家自然科学基金(41466001)
【分类号】：P642.22;P736

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