基于CPT确定埕岛油田黏性土不排水抗剪强度方法的探讨  

Discussions of CPT Derived Undrained Shear Strength of Cohesive Soil in Chengdao Oilfield

作　　者：韩猛[1] 李国 叶纪超 侯方 HAN Meng;LI Guo;YE Jichao;HOU Fang(Sinopec Qingdao LNG Co.Ltd.,Qingdao 266400;Sinopec Shengli Petroleum Engineering Corporation,Dongying 257000;Sinopec Petroleum Engineering Corporation,Dongying 257026)

机构地区：[1]中国石化青岛液化天然气有限责任公司,山东青岛266400 [2]中石化胜利石油工程有限公司井下作业公司,山东东营257000 [3]中石化石油工程设计有限公司,山东东营257026

出　　处：《土工基础》2020年第4期520-524,共5页Soil Engineering and Foundation

摘　　要：埕岛油田海底地层分布有大量的黏性土,其不排水抗剪强度是海洋工程地基基础设计重要的力学参数。通过对比三种黏性土不排水抗剪强度的确定方法,分析总结各试验方法的优缺点。结合工程实例,对三轴试验所得不排水抗剪强度与静力触探锥尖阻力进行了线性回归分析,获得锥尖阻力计算不排水抗剪强度的相关关系。随后通过误差分析验证,认为该方法对埕岛油田海底黏性土的不排水抗剪强度取值可行、准确。最后,进一步细化分析得到埋深分别0~5m、5~10m、10~20m黏性土不排水抗剪强度关键参数选取方法。A large amount of clay is deposited at the seabed of the Chengdao Offshore Oilfield,and its undrained shear strength is an important mechanical parameter for the foundation design of marine structures.In this paper,by comparing three methods for estimating the undrained shear strength of cohesive soil.Both the advantages and disadvantages of each test method are evaluated and summarized.Combined with engineering examples,a linear regression analysis of the undrained shear strength obtained by the triaxial test and the resistance of the cone penetration tip was conducted to obtain the correlations between the cone tip resistance and the calculated undrained shear strength.Then throughout the error analysis and verification,it is considered that the method is feasible and accurate for the undrained shear strength of the seabed clay in Chengdao Offshore Oilfield.Finally,a further detailed analysis was conducted to obtain the key parameter selection methods for the undrained shear strength of clay soil with buried depths of 0~5m,5~10m,and 10~20m.

关 键 词：不排水抗剪强度 静力触探 三轴压缩试验 黏性土 

分 类 号：TU475[建筑科学—结构工程]