孔压静力触探与扁铲侧胀试验在上海软黏土中的应用研究  

Application of Piezocone Penetration Test and Flat Dilatometer Test in Shanghai Soft Clay

作　　者：陆顺 Lu Shun(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《岩土工程技术》2022年第6期494-501,共8页Geotechnical Engineering Technique

摘　　要：依托上海轨道交通市域线机场联络线岩土工程勘察项目,开展了孔压静力触探试验与扁铲侧胀试验,并获取了高质量取样压缩试验结果,研究了不同试验、不同图表分类方法对土层分类效果的影响,分析了扁铲侧胀试验与超固结比、锥尖阻力与压缩模量的关系。研究表明:孔压静力触探图表法对上海软黏土的分类效果较好,而对于过渡型土体(粉土)和“混合土”则分类不理想,扁铲侧胀试验分类方法则能达到良好的分类效果;上海地区软黏土在埋深18.0 m以内具有明显的超固结性,超固结比随着深度的增加而减小,变化差异较大,埋深大于18.0 m的土则为正常固结土;不同类型的软黏土,锥尖阻力与压缩模量之间存在着明显的线性相关关系,并可用统一公式表达。Based on the geotechnical engineering survey project of Shanghai Rail Transit Airport connecting line,the piezocone penetration test and flat dilatometer test were carried out,and the high-quality sampling compression test results were obtained.The effects of different tests and different chart classification methods on the classification effect were studied,and the relationship between flat dilatometer test and over consolidation ratio,cone tip resistance and compression modulus were analyzed.The results show that the chart method of pore pressure static cone penetration test has a good classification effect on Shanghai soft clay,but it is not ideal for transition soil(silt)and"mixed soil",and the classification method of flat dilatometer test can achieve a good classification effect.The soft clay is overconsolidation soil while the burial depth is less than 18.0 m in Shanghai area.Its overconsolidation ratio decreases with the depth increase,and the soft clay is normally consolidated soil while the burial depth is greater than 18.0 m.For different types of soft clay,there is an obvious linear correlation between cone tip resistance and compression modulus,which can be expressed by a unified formula.

关 键 词：孔压静力触探 扁铲侧胀 上海软黏土 土类划分 超固结比 压缩模量 

分 类 号：TU413[建筑科学—岩土工程]