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Title: Geobarrier system for use in underground structure
Authors: Leong, Eng Choon
Zhai, Qian
Tan, Sze Tiong
Wang, Chien Looi
Lim, Vincent Han
Kew, Jernice Huiling
Seow, Wei Kiong
Wong, Johnny Liang Heng
Rahardjo, Harianto
Satyanaga, Alfrendo
Gofar, Nurly
Mohamed, Haneena
Keywords: Geobarrier
Issue Date: 2018
Publisher: Nanyang Technological University and Housing & Development Board
Source: Harianto, R. W. L. H., Johnny; Eng Choon, Leong; Alfrendo, Satyanaga; Sze Tiong, Tan; Chien Looi, Wang; Vincent Lim Han; Kew Huiling, Jernice; Seow, Wei Kiong; Nurly Gofar; Zhai Qian; Haneena Mohamed. (2018). Geobarrier System For Use In Underground Structure. Singapore: Nanyang Technological University and Housing & Development Board.
Abstract: Rainfall-induced slope failures are a common problem in many tropical areas that are covered by residual soils such as Singapore. Tropical residual soils are known to be complex and their behavior does not follow the classical saturated soil mechanics because these soils are often unsaturated in nature. The negative pore-water pressure in unsaturated soil is highly influenced by the flux boundary condition changes (i.e., infiltration, evaporation and transpiration) resulting from the variation in climatic conditions. On the other hand, the negative pore-water pressure contributes additional shear strength to the unsaturated soil. As water infiltrates into the slope, pore-water pressure in the slope increases (matric suction decreases), and the additional shear strength due to matric suction will decrease or even disappear, causing the slope to be more susceptible to failure. Singapore is a land scarce country with a critical need to optimize land utilization. Retaining walls are important part of urban development related to the creation of new spaces for urban development where land space is very limited. Conventional concrete retaining walls are usually associated with high cost, poor aesthetic and lengthy construction time. In this study, NTU collaborated with Housing and Development Board (HDB) to develop new earth retaining structure and slope stabilization system against rainfall-induced slope failures, named Geobarrier system (GBS). A GBS is a man-made three-layer cover system designed as a vegetative layer combined with a two-layer unsaturated system which harnesses the distinct difference in unsaturated hydraulic properties between a fine-grained layer and a coarse-grained layer. GBS consists of recycled materials and does not use steel nor concrete and is hence more cost effective, thereby making it economical for use in high rise building. Geobag for vegetative layer is supported by specially designed pockets for planting different types of sustainable plant species. This monograph presents the overall design, construction procedures, finite element analyses and typical results of GBS slope. In addition, apparatuses, methodology and results of the unsaturated hydraulic properties and the unsaturated shear strength are discussed briefly in this monograph.
ISBN: 9789811159091
Rights: © 2018 Housing and Development Board and Nanyang Technological University Singapore. All rights reserved. No part of this monograph may be used, reproduced or transmitted in any form or manner without the prior written consent of Housing Development Board and Nanyang Technological University. All information (drawings, tables, charts, models, designs, specifications, photographs, computer software, surveys, calculations and other data) provided in this monograph are compiled based on previous laboratory tests, field tests, field instrumentations and numerical analyses of the corresponding soil types for specific climatic conditions, geological features, topography and vegetation of the investigated slopes. The authors do not guarantee, warrant, or make any representation regarding the use of, or the results of, the analyses and design in terms of correctness, accuracy, reliability, currentness, or otherwise; the user is expected to make the final evaluation in the context of his (her) own engineering problems. Information contained in these materials is confidential and proprietary to the Nanyang Technological University and the technology described in the information may be covered by existing patents or patent applications. The information may not be used, modified, copied, published, disclosed, distributed, transmitted, displayed or exhibited, in either electronic or printed formats, without the prior written consent of the Nanyang Technological University.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Books & Book Chapters

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