TY - JOUR
T1 - Numerical analyses for assessment of geobarrier system performance
AU - Rahardjo, H.
AU - Zhai, Q.
AU - Satyanaga, A.
AU - Leong, E. C.
AU - Wang, C. L.
AU - Wong, Johnny L.H.
N1 - Funding Information:
The findings published in this paper are based on the project “GeoBarrier System for Use in Underground Structure” (Grant No. SUL2013-3) that is supported by a research grant from the Ministry of National Development Research Fund on Sustainable Urban Living, Singapore and the works are carried out and completed in collaboration between NTU and the HDB.
Publisher Copyright:
© 2017 ASCE.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018
Y1 - 2018
N2 - Geobarrier system (GBS) is designed as both a cover system to prevent rainwater infiltration and a retaining structure to maintain slope stability. The design of GBS adopts the principle of unsaturated soil mechanics. The permeability of the coarse-grained soil can be much lower than that of the fine-grained soil under unsaturated conditions. Hence, the coarse-grained soil can act as a hydraulic barrier to prevent rainwater infiltration. In order to assess the performance of a GBS, three prototypes of GBS with instruments were constructed in Singapore. The instrumentation readings from rainfall gauge, tensiometers, and soil moisture sensors were collected and analyzed. The results of numerical analyses of the GBS slope agreed with the field measurement data, indicating that there was no rainwater infiltration into the coarse-grained layer during rainfalls and therefore, the GBS performed well as designed. In addition, the numerical analyses results showed that the factor of safety of the slope with GBS remained relatively constant, but the factor of safety of the original slope fluctuated significantly during and after rainfall.
AB - Geobarrier system (GBS) is designed as both a cover system to prevent rainwater infiltration and a retaining structure to maintain slope stability. The design of GBS adopts the principle of unsaturated soil mechanics. The permeability of the coarse-grained soil can be much lower than that of the fine-grained soil under unsaturated conditions. Hence, the coarse-grained soil can act as a hydraulic barrier to prevent rainwater infiltration. In order to assess the performance of a GBS, three prototypes of GBS with instruments were constructed in Singapore. The instrumentation readings from rainfall gauge, tensiometers, and soil moisture sensors were collected and analyzed. The results of numerical analyses of the GBS slope agreed with the field measurement data, indicating that there was no rainwater infiltration into the coarse-grained layer during rainfalls and therefore, the GBS performed well as designed. In addition, the numerical analyses results showed that the factor of safety of the slope with GBS remained relatively constant, but the factor of safety of the original slope fluctuated significantly during and after rainfall.
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U2 - 10.1061/9780784481677.007
DO - 10.1061/9780784481677.007
M3 - Conference article
AN - SCOPUS:85049755240
SN - 0895-0563
VL - 2017-November
SP - 132
EP - 148
JO - Geotechnical Special Publication
JF - Geotechnical Special Publication
IS - GSP 300
T2 - 2nd Pan-American Conference on Unsaturated Soils: Plenary Papers, PanAm-UNSAT 2017
Y2 - 12 November 2017 through 15 November 2017
ER -
