Effects of variability of unsaturated hydraulic properties on stability of residual soil slopes

Q. Zhai, H. Rahardjo, A. Satyanaga

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Matric suction plays an important role in stability of residual soil slopes against rainfall. Changes in matric suction during rainfall are controlled by infiltration characteristics of the soil. Both Soil-Water Characteristic Curve (SWCC) and unsaturated permeability function (kw function) have significant effects on the infiltration characteristics of the soil. The matric suction in the soil can be computed using the governing flow equation with input of SWCC and kw function. The variability in unsaturated soil properties such as SWCC and kw function will result in uncertainties in the computed matric suction in the soil during rainfall. Consequently, uncertainty in matric suction will affect the computed Factor Of Safety (FOS) for slope stability. In this study, confidence limits of SWCC and kw function of residual soils derived from Bukit Timah granite in Singapore are computed using the experimental data from published literatures. The variability in the computed matric suction and FOS as a result of uncertainty in SWCC and kw function is presented by analyzing a typical slope with constant boundary conditions and varying soil properties (i.e. SWCC and kw function). The effects of variability in SWCC and kw function on the infiltration and slope stability are discussed in this paper.

Original languageEnglish
Title of host publicationUnsaturated Soil Mechanics from Theory to Practice - Proceedings of the 6th Asia-Pacific Conference on Unsaturated Soils
EditorsZhenghan Chen, Changfu Wei, Dean Sun, Yongfu Xu
PublisherCRC Press/Balkema
Pages401-406
Number of pages6
ISBN (Print)9781138029217
DOIs
Publication statusPublished - 2016
Externally publishedYes
Event6th Asia-Pacific Conference on Unsaturated Soil Mechanics from Theory to Practice, AP-UNSAT 2015 - Guilin, China
Duration: Oct 23 2015Oct 26 2015

Publication series

NameUnsaturated Soil Mechanics from Theory to Practice - Proceedings of the 6th Asia-Pacific Conference on Unsaturated Soils

Conference

Conference6th Asia-Pacific Conference on Unsaturated Soil Mechanics from Theory to Practice, AP-UNSAT 2015
CountryChina
CityGuilin
Period10/23/1510/26/15

ASJC Scopus subject areas

  • Soil Science

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