摘要
通过标贯试验和室内土工试验,对南京地铁地基土标贯与部分物理及力学参数的相关关系进行研究,给出线性拟合关系式及其相关系数。结果表明:砂土、黏土的压缩模量、承载力、单位体积重力、黏聚力都与标贯击数成正比关系,线性相关系数绝大部分达0.95以上;黏土的内摩擦角、导热系数、导温系数与标贯击数成正比关系,线性相关系数在0.97以上;砂土、黏土的压缩系数、孔隙比、液性指数与标贯击数成反比关系,线性相关系数绝大部分达0.94以上;砂土的内摩擦角、水平渗透系数与标贯击数成反比,线性相关系数分别为0.88、0.99;黏土的比热容、垂直渗透系数与标贯击数成反比,线性相关系数分别为0.86、0.98;南京地铁地基土的以上这些物理及力学参数可用本文建立的以标贯击数为自变量的线性关系式来进行预测。
Through the standard penetration tests （SPT） and geotechnical tests, the correlativity between the SPT parameters and physical and mechanical parameters of foundation soil of the Nanjing Subway is studied. The linear fitting formulae and related coefficients are given. The following conclusions are drawn. The compress module, bearing capacity, weight density and cohesive strength of sand soil and clay soil are directly proportional to the blow counts of SPT, most of the linear correlativity coefficients are larger than 0.95; the inner friction angle, thermal conductivity coefficient and thermal diffusivity coefficient of clay soil are directly proportional to the blow counts of SPT, the linear correlativity coefficients are larger than 0.97; the compress coefficient, hole ratio and fluid index of sand soil and clay soil are inversely proportional to the blow counts of SPT, most of the linear correlativity coefficients are larger than 0.94; the inter friction angle and horizontal infiltration coefficient of sand soil are inversely proportional to the blow counts of SPT, the linear correlativity coeffi- cients are 0.88 and 0.99 respectively; the specific heat capacity and vertical infiltration coefficient of clay soil are inversely proportional to the blow counts of SPT, the linear correlativity coefficients are 0.86 and 0.98 respectively; the physical and mechanical parameters mentioned above can be forecasted by the linear fitting formulae whose independent variable is the blow count of SPT.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2010年第1期123-127,共5页
Journal of the China Railway Society
基金
上海市教育委员会科研创新项目(09YZ250)
上海海事大学校基金项目(2009160)
上海海事大学校级重点学科项目(2009445878)
关键词
标贯
试验
土
南京地铁
standard penetration test （SPT）
test
soil
Nanjing Subway
