TY - JOUR
T1 - Flume-scale experiments on suffusion at bottom of cutoff wall in sandy gravel alluvium
AU - Luo, Yulong
AU - Nie, Min
AU - Xiao, Ming
N1 - Funding Information:
The support from Natural Science Foundation of China (project Nos. 51679070, 51009053, 51579078, and 51474204), Hohai University Excellent Innovative Talents Support Program, a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, and The Pennsylvania State University is gratefully acknowledged.
Publisher Copyright:
© 2017, Canadian Science Publishing. All rights reserved.
PY - 2017
Y1 - 2017
N2 - This paper presents a series of flume-scale experiments to investigate suffusion at the bottom of a cutoff wall in an internally unstable sandy gravel alluvium. The initiation, progression, and potential failure of suffusion and the interactive effects of geomechanical and hydraulic conditions with the evolution of suffusion were investigated in this particular application. Temporal and spatial development of pore pressure, earth pressure, and settlement demonstrated suffusion was a multiphase (involving pore water, fine and coarse fractions) and multi-field (involving seepage, seepage-induced fine-fraction variation, and stress-deformation) coupling phenomenon. Suffusion initiated at the downstream side of the tip of the cutoff wall and then generally progressed backward to the upstream side. The monitored earth pressure provided an evidence of the heterogeneous stress distribution in internally unstable soil. Two linear empirical formulas for average hydraulic gradients at the initiation of suffusion and at blowout were derived based on the flume-scale model experiments.
AB - This paper presents a series of flume-scale experiments to investigate suffusion at the bottom of a cutoff wall in an internally unstable sandy gravel alluvium. The initiation, progression, and potential failure of suffusion and the interactive effects of geomechanical and hydraulic conditions with the evolution of suffusion were investigated in this particular application. Temporal and spatial development of pore pressure, earth pressure, and settlement demonstrated suffusion was a multiphase (involving pore water, fine and coarse fractions) and multi-field (involving seepage, seepage-induced fine-fraction variation, and stress-deformation) coupling phenomenon. Suffusion initiated at the downstream side of the tip of the cutoff wall and then generally progressed backward to the upstream side. The monitored earth pressure provided an evidence of the heterogeneous stress distribution in internally unstable soil. Two linear empirical formulas for average hydraulic gradients at the initiation of suffusion and at blowout were derived based on the flume-scale model experiments.
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U2 - 10.1139/cgj-2016-0248
DO - 10.1139/cgj-2016-0248
M3 - Article
AN - SCOPUS:85035759228
SN - 0008-3674
VL - 54
SP - 1716
EP - 1727
JO - Canadian Geotechnical Journal
JF - Canadian Geotechnical Journal
IS - 12
ER -