岩土力学2012，Vol.33Issue(10)：3037-3042,6.
三轴试验抗剪强度参数值回归分析法的区别与修正
Difference and modification of regression analysis methods to estimate shear strength parameters obtained by triaxial test
摘要
Abstract
Foshan Nanhai Power Supply Bureau, Guangdong Power Grid Corporation, Foshan, Guangdong 528200, China) The values of shear strength parameters, c and φ, estimated by two linear regression methods from data of rock or soil triaxial test are different. To reveal the basic cause of differences between the two regression methods, the principle of linear regression based on the least square method is analyzed thoroughly. The results estimated by regressing maximum principal stress with minor principal stress are the best values, while the results obtained by regressing maximum shear stress with average normal stress are not reliable. Modification for least square method of the latter regression method is done to obtain uniform results. Formulas for calculating modified regression coefficients are deduced. It is proved that results by the two methods after modification are the same; and they are applied to calculate the shear strength parameters in triaxial tests of phyllite. The results show that to rock or soil triaxial test, the values of shear strength parameters calculated by the two methods after modification are also the same best and unbiased estimations.关键词
抗剪强度/线性回归/最小二乘法/三轴压缩试验Key words
shear strength/ linear regression/ least square method/ triaxial compression test分类
建筑与水利引用本文复制引用
余东明,姚海林,吴少锋..三轴试验抗剪强度参数值回归分析法的区别与修正[J].岩土力学,2012,33(10):3037-3042,6.基金项目
国家重点基础研究发展规划"973"项目(No.2013CB036405) （No.2013CB036405）
西部交通建设科技项目(No.2011318775680). （No.2011318775680）
