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All Journal INTEK: Jurnal Penelitian Lowland Technology International
Muhamad Suradi
State Polytechnic Of Ujung Pandang
Civil Engineering, Building, Construction & Architecture Education Engineering Transportation

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Rainfall-induced Failures of Residual Soil Slopes with Spatial Variability of Hydraulic Conductivity Muhamad Suradi
INTEK: Jurnal Penelitian Vol 3, No 1 (2016): April 2016
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (517.698 KB) | DOI: 10.31963/intek.v3i1.7

Abstract

The aim of this paper was to examine the effect of spatial variability of hydraulic conductivity, commonly existing in nature, on rainfall-induced failures of residual soil slopes. Parametric study was carried out at typically residual soil slopes with two distinctively different types of hydraulic conductivity, high (ks=10-4 m/s) and low (ks=10-6 m/s) conductivity, in Singapore. Finite element method was applied in this slope stability analysis using commercial SVFlux and SVSlope software in a couple manner. Rainfall intensity was varied as a fraction of the hydraulic conductivity. As a result, greater spatial variability of saturated hydraulic conductivity affects more noticeably the instability of both high and low-conductivity soil slopes exposed to high-rainfall intensity (I > 0.05 ks for high-conductivity slopes and I >1 ks for low- conductivity slopes). However, there was a negligible effect of spatial variability of hydraulic conductivity on the instability of slopes subjected to low-rainfall intensity, even this spatial variability tended to slightly increase the stability of high-conductivity slopes.
Vertical Stress Distribution at Soil Layers with Various Consistencies under the Footing Contact Area Muhammad suradi Suradi; H. A. Hasanuddin; Nursamiah .
Lowland Technology International Vol 22 No 4 (2021): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i4.697

Abstract

According to the Elastic Theory by Boussinesq, vertical stress distribution under the footing contact area will diminish with distance from the contact area and it is irrespective of the soil consistency. This study aimed at investigating the effect of the soil stratigraphy and consistency on vertical stress distribution at soil layers under the footing contact area. Soil investigation with CPT tests and relevant laboratory tests were carried out to obtain a reference of compressible soil layer thickness and relevant soil characteristics. The soil stratigraphy and parameters in conjunction with the vertical stress distribution were varied for two different types of soil, a typical granular soil e.g. sand and cohesive soil e.g. clay. Numerical analysis was performed to investigate the effect of the soil parameters on the vertical stress distribution. The results revealed a similarity between those obtained from the Elastic Theory (manual analysis) and numerical study using the PLAXIS software. However, the results of the numerical study showed a significant influence of the soil consistency on the vertical stress distribution at soil layers under the footing contact area.
Co-Authors H. A. Hasanuddin Nursamiah .