Laboratory assessment of the effect of vibro-replacement ground improvement on the mechanical response of natural silt

被引:0
|
作者
Verma, Priyesh [1 ]
Wijewickreme, Dharma [2 ]
机构
[1] BGC Engn Inc, Suite 500-980 Howe St, Vancouver, BC V6Z 0C8, Canada
[2] Univ British Columbia, Dept Civil Engn, 6250 Appl Sci Lane, Vancouver, BC V6T 1Z4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Low-plastic silts; Ground improvement; Fine-grained soils; Cyclic direct simple shear; Liquefaction; Vibro-replacement stone columns; SHEAR; SOILS;
D O I
10.1016/j.soildyn.2023.108059
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The effect of vibro-replacement ground improvement on the mechanical response of a low-plastic silt was examined using constant-volume monotonic and cyclic direct simple shear (DSS) testing. The silt samples representing "pre-improvement", "post-improvement", "post-improvement-aged" phases were retrieved from the field for testing. The pre- and post-improvement silt specimens consolidated to in-situ stress state, under constant-volume monotonic DSS shearing, displayed no strain-softening. Cyclic-mobility type strain accumulation with a stress-history-normalizable response was noted when pre- and post-improvement silt specimens were tested under constant-volume cyclic DSS loading, in spite of the ground improvement imparted in the latter case. In contrast, the post-improvement-aged silt specimens at in-situ stress state displayed a dilative strain hardening response. Under similar cyclic stress ratios, the rate of build-up of excess pore water pressure with increasing number of loading cycles was found to be least for the post-improvement-aged silt specimens when compared with pre- and post-improvement cases. As such, the cyclic resistance ratio of the post-improvement-aged silt specimens were significantly higher when compared with those from pre- and post-improvement silt specimens. These findings also highlight the importance of understanding the effects of vibro-replacement on the soil fabric/ microstructure especially considering the time elapsed since the application of ground improvement.
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页数:15
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