Numerical analyses for assessment of geobarrier system performance

H. Rahardjo, Q. Zhai, A. Satyanaga, E. C. Leong, C. L. Wang, Johnny L.H. Wong

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)132-148
Number of pages17
JournalGeotechnical Special Publication
Volume2017-November
Issue numberGSP 300
DOIs
Publication statusPublished - 2018
Externally publishedYes
Event2nd Pan-American Conference on Unsaturated Soils: Plenary Papers, PanAm-UNSAT 2017 - Dallas, United States
Duration: Nov 12 2017Nov 15 2017

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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