朱建群, 胡大为, 李雄威, 代国忠, 施维成. 2017: 基于粒间状态变量的含细粒砂土力学性状分析. 工程地质学报, 25(3): 747-754. DOI: 10.13544/j.cnki.jeg.2017.03.022
    引用本文: 朱建群, 胡大为, 李雄威, 代国忠, 施维成. 2017: 基于粒间状态变量的含细粒砂土力学性状分析. 工程地质学报, 25(3): 747-754. DOI: 10.13544/j.cnki.jeg.2017.03.022
    ZHU Jianqun, HU Dawei, LI Xiongwei, DAI Guozhong, SHI Weicheng. 2017: MECHANISM BEHAVIOURS OF SANDS WITH FINES BASED ON INTERGRANULAR STATE VARIABLES. JOURNAL OF ENGINEERING GEOLOGY, 25(3): 747-754. DOI: 10.13544/j.cnki.jeg.2017.03.022
    Citation: ZHU Jianqun, HU Dawei, LI Xiongwei, DAI Guozhong, SHI Weicheng. 2017: MECHANISM BEHAVIOURS OF SANDS WITH FINES BASED ON INTERGRANULAR STATE VARIABLES. JOURNAL OF ENGINEERING GEOLOGY, 25(3): 747-754. DOI: 10.13544/j.cnki.jeg.2017.03.022

    基于粒间状态变量的含细粒砂土力学性状分析

    MECHANISM BEHAVIOURS OF SANDS WITH FINES BASED ON INTERGRANULAR STATE VARIABLES

    • 摘要: 在探讨含细粒砂土内部结构和粒间相互作用的基础上,引入粒间状态变量概念,对含细粒砂土力学性状随细粒含量的变化进行了预测分析:当Drs >>0时含细粒砂土类似于e=ec时均质砂的不排水性状,具有较高的强度;当Drs→0时含细粒砂土最终性状具有不确定性;当Drs < 0时含细粒砂土表现为剪缩性状。将南京砂中粗粒和细粒进行重新配制获得含不同细粒的砂土,对它们进行不排水剪试验;在利用粒间状态变量对试验结果进行分析的基础上,将试验结果与预测分析进行比对,两者的吻合性较高。在ec-logSus空间内稳态线随粉粒的增加而向上移动,且各稳态线间呈平行状。因此,粒间状态变量能较好地反映无黏性土力链的变化,是描述砂土微观结构的新途径。

       

      Abstract: This paper is based on the discussion of the framework of sands with fines and the interaction between coarse and fine particles. It shows the intergranular state variables for a particular host sand mixed with different amounts of nonplastic fines. It presents large strain undrained shear strength (Sus) data and steady state line in triaxial compression for the samples. Results indicate that when Drs >>0 (which is defined as intergranular relative density), the undrained shear strength of the composited soil of sand-silt is similar to that of homogeneous sand with e=ec, which is high. When Drs→0, the undrained characteristic of the samples is uncertain, but it is obvious that the undrained shear strength of the composited soil is lower than that of the homogeneous sand. When Drs < 0, the composited soil exhibits the contractive behaviour caused by shear stress, and the Sus is lower than the others. In this research, the particular host sand mixed with nonplasitc fine is from Nanjing sand. The comparison between the test result and the predicted situation is done, and both of them is anastomose. The steady state lines in ec-logSus increases with the amount of the fines, and are parallel. The intergranular state variables can reflect the interaction between sand and fine particles, defined as force chain in cohesionless soil. This research is presented for the choice for the microstructure of sand mixed with fines.

       

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