南海北部陆坡表层沉积物强度特征研究

发布时间：2018-01-18 00:14

本文关键词：南海北部陆坡表层沉积物强度特征研究　出处：《工程地质学报》2016年05期 　论文类型：期刊论文

【摘要】：随着海洋开发活动由浅海走向深海,南海北部陆坡的沉积物强度特性逐渐成为关注热点。本文通过参与2015年与2016年共享航次计划,在南海北部莺琼陆坡、神狐陆坡、东沙陆坡、台湾浅滩陆坡进行沉积物重力取样与箱式取样,并现场剖样,用以进行沉积物强度测试。地质取样结果表明东沙陆坡砂含量相对较高并发现直径约22cm黑色气孔状碳酸盐结核。在神狐陆坡沉积物表层发现活体壳类生物,在110cm深度处发现壳类生物遗骸。十字板剪切试验与笔式贯入试验结果表明南海北部陆坡,沉积物强度差异较大。但总体而言,除东沙陆坡外,莺琼陆坡、神狐陆坡、台湾浅滩陆坡表层沉积物强度一般较低。0~20cm范围内,笔式贯入阻力一般小于0.1N,十字板剪切强度最大一般不超过10k Pa。0~300cm深度范围内,沉积物强度沿深度方向大致呈递增趋势,个别站位递增趋势不明显。台湾浅滩陆坡等南海北部陆坡表层沉积物存在强度分层:分层界面以上,沉积物强度较低;分层界面处,沉积物强度骤增。该分层界面可能是海底滑坡的潜在滑动面。
[Abstract]:With the marine development from shallow to deep sea, the sediment intensity characteristics of the northern slope of the South China Sea gradually become a hot spot. This paper participated in the joint voyage plan of 2015 and 2016. In the northern South China Sea Yingqiong slope, Shenhu slope, eastern sandy slope, Taiwan shoal slope, sediment gravity sampling and box sampling, and field profile. The results of geological sampling showed that the sand content was relatively high and the diameter of 22 cm black stomatal carbonate nodules were found in Dongsha continental slope. Living crustal organisms were found in the surface sediments of Shenhu continental slope. . Crusts were found at a depth of 110 cm. The results of cross plate shear test and pen-type penetration test showed that there was a great difference in sediment strength in the northern South China Sea, but in general, except the Dongsha slope. The surface sediment strength of Yingqiong slope, Shenhu slope and Taiwan shoal slope is generally low in the range of 20 cm, and the pen-type penetration resistance is generally less than 0.1 N. The maximum shear strength of cross plate is less than 10k Pa.0~300cm depth, and the sediment strength is increasing along the depth direction. The increasing trend of individual stations is not obvious. The surface sediments in the northern slope of the South China Sea, such as Taiwan shoal slope, have strength stratification: above the stratification interface, the sediment intensity is low; The sediment strength increases sharply at the stratified interface, which may be the potential sliding surface of the submarine landslide.
【作者单位】：中国海洋大学山东省海洋环境地质工程重点实验室;海洋国家实验室海洋地质过程与环境功能实验室;
【基金】：国家自然科学基金(41427803;41502265) 青岛海洋科学与技术国家实验室鳌山科技创新计划项目(2015ASKJ03)资助
【分类号】：P736.21;P75
【正文快照】： 0引言我国海洋地质环境复杂,既有宽阔的大陆架与大陆坡,也有深邃的边缘海盆地,海陆交互作用频繁,地质灾害类型多样。尤其近年来,海洋油气工程、港口近岸工程、海底通讯工程、海洋交通工程、围海造陆工程的发展将海洋工程地质研究推向了新的高潮,成为工程地质学科的最新研究热

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