摘要
基于上海地区19个工程共201组数据,通过黏土、粉质黏土和粉砂在上海地区土层中的分布,比贯入阻力Ps,室内固结快剪试验黏聚力cu和摩擦角?u,孔隙比e,塑性指数Ip沿土层深度的变化,分析得到3种土类的抗剪强度与比贯入阻力的相关关系,并总结了国内软土地区土体抗剪强度与静力触探比贯入阻力之间的相关关系。本文得到黏土的相关关系与以往的经验公式相近,同时给出了原位土层粉质黏土和粉砂的相关关系。区别不同土类使得相关关系可用性提高,在工程应用中更加合理。根据本文相关关系,通过静力触探比贯入阻力可以得到不同土层的抗剪强度值,进而应用于基坑稳定计算。本文研究的结果可以应用于海相沉积土的勘察和工程设计工作。
Two hundred and one groups of cone penetration test （CPT） data from 19 projects in Shanghai are adopted. The distribution of clay, silty clay and silt in Shanghai area are obtained. The specific penetration resistance （Ps）, cohesive strength （cu） and frictional angle （？u） of consolidated quick shear test, void ratio （e）, and plasticity index （Ip） are varied along the soil depth. The soil shear strength （Su） of clay, silty clay and silt are correlated with specific penetration resistance （Ps） of CPT. The correlations between Su and Ps are summarized for various types of soft soils in China. It has been found that the correlation coefficients of clays obtained from this study are similar to the published data. Also the in situ soil correlations of silty clay and silt are given. These correlations of Su with Ps are useful for classified soil and valuable to engineering application. According to correlations in this paper, the calibrated correlation coefficients can be used to determine Su based on Ps for foundation pit stability calculation. The results of the study can be used for geological investigation and engineering design work.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2014年第2期536-542,共7页
Rock and Soil Mechanics
基金
国家自然科学基金面上项目(No.51078352)
铁道部"深大基坑岩土工程力学特性和勘察技术研究"(TY字第2984号)
关键词
抗剪强度
比贯入阻力
相关关系
分土类
shear strength
specific penetration resistance
correlations
soil type
