南京地铁(融)土热物理参数试验研究  

Experimental Study on the Thermophysical Parameters of (Thawed) Soil in the Foundation of Nanjing Metro Engineering

作　　者：蒋建平[1] 李晓昭[2] 高广运[3] 罗国煜[2] 

机构地区：[1]上海海事大学海洋环境与工程学院,上海200135 [2]南京大学地球科学与工程学院,江苏南京210093 [3]同济大学土木工程学院,上海200092

出　　处：《中国铁道科学》2009年第1期13-16,共4页China Railway Science

基　　金：国家自然科学基金资助项目(50678128);上海市教委科研项目(05FZ03);上海市教委交通运输与规划重点学科项目(J50601)

摘　　要：在南京地铁地基勘察阶段取原状土样进行室内土热物理参数测试和土工试验。土热物理参数中的比热容采用差示扫描量热仪DSC—6测试,导热系数采用TC Probetm热导仪测试,导温系数通过计算得到。对土热物理参数与一般土工参数间的关系分别进行回归分析。结果表明:南京地基黏性土样热物理参数分别与含水率、湿密度、孔隙比、液性指数、压缩模量、标贯6个一般土工参数的一元回归模型的相关系数的在0.93左右,说明热物理参数与一般土工参数具有密切相关关系;热物理参数与塑性指数、孔隙比、湿密度3个一般土工参数的三元回归模型的相关系数分别为0.866 5,0.824 4,0.685 1,说明热物理参数与前两者属强相关关系。During the foundation survey phase of Nanjing Metro engineering, undisturbed soil samples were taken to conduct indoor experiments on soil thermophysical parameters and corresponding geotechnical tests. In thermophysical parameters, the specific heat capacity was tested by Differential Scanning Calorimetry DSC-6, the thermal conductivity coefficient was tested by thermal-detector TC Probetm, and the thermal diffusivity coefficient was obtained by calculation. The regression analysis was carried out on the relationship between the thermophysical parameters and routine geotechnical parameters. The results show that the correlativity coefficients are all about 0.93 between the thermophysical parameters of the cohesive soil samples taken from the foundation of Nanjing Metro and the univariate regression models of the six routine geotechnical parameters as water content, wet density, void ratio, liquid index, compression modulus and standard penetration. It shows that there is close correlativity between the thermophysical parameters and the routine geotechnical parameters. The correlativity coefficients between the thermophysical parameters and the trivariate regression models of the plasticity index, void ratio and wet density are 0. 866 5, 0. 824 4, and 0. 685 1 respectively, which indicates that there are stronger correlations between the thermophysical parameters and the plasticity index and void ratio as well.

关 键 词：比热容 导热系数 导温系数 土工参数 黏性土 南京地铁 

分 类 号：TU441.3[建筑科学—岩土工程]