Abstract

The classification of seabed soil in the Yellow River Subaquatic Delta can be obtained more accurately by cone penetration test (CPT). The Soil behavior type index (I_c), over-consolidation ratio (OCR), sensitivity (S_t) and the relationship between them were clarified. The cyclic stress ratio (CSR) of seabed soil in the Yellow River Delta was calculated based on the wave elements in the 5-year recurrence period, and the cyclic resistance ratio (CRR) was further obtained by calculating the shear wave velocity. The liquefaction analysis was carried out. The analysis of the structure and liquefaction of the seabed soil in the Yellow River Delta is mainly from the following aspects: the seabed soil in the Yellow River Delta is mainly composed of silty soil, sandy soil and cohesive soil. Most areas are in the state of over-consolidation, with the OCR between 20 and 60, and the over-consolidation ratio decreases with the increase of offshore distance. It belongs to the highly sensitive soil layer with poor structure, and the sensitivity is linearly correlated with the over-consolidation ratio. The degree of liquefaction of soil layer is higher than that of offshore soil layer, and the liquefaction of sensitive fine-grained soil layer occurs easily.

摘要

黄河水下三角洲海床土壤的分类可以通过锥入度试验（CPT）更准确地得到。土壤行为类型指数（I _c）、超固结率（OCR）、敏感性（S _t) 并澄清了它们之间的关系。黄河三角洲海床土的循环应力比(CSR)是根据5年重复周期的波浪元素计算得到的，再通过剪切波速度计算得到循环阻力比(CRR)。进行液化分析。黄河三角洲海底土的结构和液化分析主要从以下几个方面进行分析：黄河三角洲的海底土主要由粉质土、沙质土和粘性土组成。大部分地区处于超固结状态，OCR在20~60之间，超固结率随着离岸距离的增加而降低。属于结构较差的高敏感土层，敏感性与超固结率呈线性相关。土层液化程度高于近海土层，易发生敏感细粒土层液化。