摘要
为探究张家口地区非饱和土在不同围压以及基质吸力下的抗剪强度特性,利用非饱和土三轴仪进行非饱和土三轴剪切试验,对非饱和土的持水能力、抗剪强度,以及抗剪强度指标进行分析,得出非饱和土抗剪强度的预测模型.研究结果表明:随基质吸力的增大,黏聚力增大,内摩擦角变化较小;非饱和土的吸力强度与基质吸力存在线性关系,以此提出仅有基质吸力强度系数的抗剪强度公式,利用基质吸力强度系数和土样的塑性指数相关性可预测非饱和土的强度.研究结论为冀西北地区非饱和土的强度测定提供了理论依据.
In order to explore the shear strength characteristics of unsaturated soil in Zhangjiakou area under different confining pressures and matrix suction,a triaxial shear test of unsaturated soil was carried out using an unsaturated soil triaxial apparatus.The water holding capacity,shear strength and shear strength indexes of unsaturated soil were analyzed,and a convenient prediction model for predicting the shear strength of unsaturated soil was found.The results show that after the shear failure of the soil,with the continuous increase of the matrix suction,the cohesive force also increases and the change of internal friction angle is small.There is an obvious linear relationship between the suction strength of the unsaturated soil and the matrix suction.Based on this,a shear strength formula with only one parameter a is proposed,and it is found that the parameter is related to the plasticity index of the soil sample.The strength of unsaturated soil can be predicted by measuring the plasticity index value of the soil.The research conclusions provide a theoretical basis for the strength measurement of unsaturated soil in northwestern Hebei.
作者
崔宏环
杨兴然
孙利成
张振寰
何静云
王小敬
CUI Honghuan;YANG Xingran;SUN Licheng;ZHANG Zhenhuan;HE Jingyun;WANG Xiaojing(Hebei Key Laboratory of Civil Engineering Diagnosis,Reconstruction and Disaster Relief,Zhangjiakou 075000,China;School of Civil Engineering,Hebei Institute of Civil Engineering and Architecture,Zhangjiakou 075000,China;Beiwang Construction Group Company Limited,Chengde 067000,China)
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2022年第1期1-6,共6页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金(51878242)
关键词
非饱和土
三轴试验
吸力强度
强度预测
基质吸力
unsaturated soil
triaxial test
suction intensity
intensity prediction
matric suction
