Abstract

The Yellow River Delta is one of the most abundant offshore energy areas in China, and the construction of offshore projects is rapidly developing. In this paper, four typical regions of the Yellow River Delta in different periods were selected as research objects. In-situ cone penetration tests (CPTs), geotechnical testing, electron microscope scanning testing, and soil type indexing (I_c) was used to classify and identify the soil layers. At the same time, a modified calculation model based on CPT for the shear wave velocity of fine-grained seabed soil was sought and verified with the measured values. The results showed that: (1) the obtained soil layers are mainly classified by clay and silty soil, which is in line with the conclusions of previous scholars on the classification of the Yellow River Delta soil layer. (2) The measured shear wave velocity is generally between 100 m/s and 250 m/s, and it gradually increases with depth. (3) The depth, cone resistance, and soil behavior index are directly related to the calculation of the shear wave velocity in this area. (4) Discrete analysis of measured and calculated shear wave velocity provides theoretical support for the change of shear wave velocity under different conditions.

摘要

黄河三角洲是我国海上能源最丰富的地区之一，海上项目建设发展迅速。本文选取黄河三角洲不同时期的四个典型区域作为研究对象。原位锥入度测试 (CPT)、岩土测试、电子显微镜扫描测试和土壤类型索引 (I _c) 用于对土壤层进行分类和识别。同时，寻找基于CPT的细粒海底土剪切波速修正计算模型，并用实测值进行验证。结果表明：（1）所得土层以黏土和粉质土为主，与前人对黄河三角洲土层分类的结论一致。(2)实测横波速度一般在100m/s～250m/s之间，随深度逐渐增大。(3) 深度、锥体阻力和土性指标直接关系到本区剪切波速度的计算。(4) 实测和计算剪切波速度的离散分析为不同条件下剪切波速度的变化提供了理论支持。