摘要
抗剪强度是非饱和黄土性质研究的重要参数,随着基质吸力的增大、饱和度的降低,非饱和黄土的抗剪强度也随之增大。研究以陕西泾河L5地层的黄土为实验对象,通过室内非饱和三轴实验,根据文献[3]中提出的双变量非饱和土抗剪强度理论公式结合土水特征曲线得到抗剪强度的相关参数,进而得到不同基质吸力下的抗剪强度以及强度曲线。通过对实验结果的分析并结合文献[8]中对于强度参数tanφb的讨论及研究,得到了适用于泾河L5地层非饱和黄土的强度公式。实验结果表明,基质吸力对非饱和黄土的抗剪强度有显著作用,但随着基质吸力的增大,抗剪强度的增长速率越来越小,且当拟合参数κ=1.8时,强度曲线的拟合度最高。
Shear strength is an important parameter in the study of properties of unsaturated loess.With the increase of matric suction and the decrease of saturation,the shear strength of unsaturated loess also increases.Taking the loess in the L 5 stratum of Jinghe River in Shaanxi Province as the test object,an indoor unsaturated triaxial test is implemented,and the theoretical formula of shear strength,proposed by reference[3].for bivariate unsaturated soil,is employed to obtain the related parameters by combining with the soil-water characteristic curve.Furthermore,the shear strength and strength curves under different matric suctions are obtained too.Based on the analysis of the test results,and on the discussion and study of the strength parameter tanφb using formula of reference[8],the strength formula is obtained for unsaturated loess in the L 5 stratum of Jinghe River.The test results show that the matric suction significantly affects the shear strength of unsaturated loess,but with its increase,the growth rate of shear strength becomes smaller and smaller,and when the fitting functionκ=1.8,the strength curve fitting reaches the highest.
作者
薛博文
李同录
邓乐娟
Xue Bowen;Li Tonglu;Deng Lejuan(School of Geological Engineering and Geomatics,Chang’ an University,Xi'an 710054,China)
出处
《甘肃科学学报》
2019年第3期54-58,共5页
Journal of Gansu Sciences
基金
国家自然科学基金(41772278,41372329)
中央高校基本科研业务费资助项目(310826172001,310826171008)
关键词
非饱和黄土
基质吸力
抗剪强度
强度参数
Unsaturated loess
Matrix suction
Shear strength
Strength parameter
