Influence of Specimen Preparation on the Liquefaction Behaviors of Sand and Its Mesoscopic Explanation

被引:40
作者
Ni, Xueqian [1 ,2 ]
Ye, Bin [1 ]
Zhang, Feng [1 ,2 ]
Feng, Xiaoqing [1 ]
机构
[1] Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China
[2] Nagoya Inst Technol, Dept Civil Engn, Nagoya, Aichi 4668555, Japan
基金
中国国家自然科学基金;
关键词
Moist tamping method; Air pluviation method; Failure mode; Dominant particle orientation; Initial fabric; INITIAL STATIC SHEAR; SAMPLE PREPARATION; GRANULAR SOIL; LOOSE SAND; MICROSTRUCTURE; DEFORMATION; RESISTANCE; EVOLUTION; FAILURE; IMPACT;
D O I
10.1061/(ASCE)GT.1943-5606.0002456
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Specimen preparation methods and the resulting fabric can significantly influence the mechanical behavior of sand. To clarify the influence of specimen preparation methods on liquefaction behavior, a series of undrained cyclic triaxial tests were conducted on sand specimens prepared by different methods with a wide range of relative densities. Then, mesoscopic tests, including scanning electronic microscopy and digital image processing methods, were systematically conducted to observe the initial fabrics produced by different preparation methods. The triaxial test results demonstrated that different specimen preparation methods produce distinctly different responses, including the stress-strain relationship, failure mode, liquefaction resistance, and critical state line. Analysis of the mesoscopic testing results indicated that the initial fabrics of the specimens were affected not only by the preparation methods but also by the relative densities. A reasonable explanation for the linkage between the macromechanical behavior of the sand and the fabric formed in the specimen preparation process is given in this study. (c) 2020 American Society of Civil Engineers.
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页数:14
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