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论文类型：期刊论文

发表时间：2015-08-01

发表刊物：SOIL DYNAMICS AND EARTHQUAKE ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：75

页面范围：112-120

ISSN号：0267-7261

关键字：Low-plasticity fine-grained soil; Cyclic behavior; Post-cyclic shear behavior; Plasticity index

摘要：This paper investigates the cyclic and post-cyclic shear behavior of low-plasticity silt and the impact of additional clay content. Bentonite clay was added to the low-plasticity Mississippi River Valley (MRV) silt (PI = 6) to increase the clay content of the soil. A series of triaxial tests were conducted in the laboratory to examine the shear and pore pressure behavior during and after cyclic loading. As the bentonite content in the reconstituted specimens increased, the excess pore pressure developed at a slower rate and the total excess pore pressure decreased at the end of cyclic loading. In contrast to the MRV silt, the specimens modified with bentonite experienced cyclic softening rather than initial flow liquefaction. The cyclic shear strength increased with an increase in bentonite content. The post-cyclic reconsolidation behavior was a similar to a virgin compression process, and not recompression. Adding bentonite to the MRV silt results in changes in permeability, compressibility, undrained shear strength, and initial stiffness. Additionally, the cyclic loading had a marked effect on the shear behavior of low-plasticity soil with a PI < 6, but not noticeable with a PI > 6. This study suggests that the behavior of the Mississippi River Valley silt changes from contractive sand-like material to clay-like behavior at a PI approximate to 6 due to the addition of clay. (C) 2015 Elsevier Ltd. All rights reserved.