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• W313893430 abstract "A novel plane strain approach is introduced to model the behaviour of embankment foundations on soft clay stabilised with vertical drains, where the classical axisymmetric solutions are converted to an equivalent plane strain model, incorporating the effects of smear and well resistance. This paper describes the behaviour of an embankment stabilised with vertical drains, where a specific case history is selected from Malaysia. The consolidation of soft clay is modelled on the basis of the modified Cam-clay. The settlement behaviour at various stages of embankment loading is analysed using the finite element technique, and the numerical results are compared with field measurements. The behaviour of drains with and without smear is also compared. Inclusion of smear effect in the mathematical model improves the prediction of settlements. INTRODUCTION The deformations of soft clay foundations stabilised with vertical band drains has remained difficult to predict accurately, although a significant progress has been made in the past few years through rigorous numerical modeling. The conventional solution for vertical drains (single drain analysis) has been well documented (Barron, 1948; Hansbo, 1981). Attributed to the rapid development in computer technology and the increasing versatility of the finite element method, a thorough numerical analysis of the settlement of the soft soil stabilised with multiple vertical drains can now be conducted. Following previous developments (e.g. Cheung et al., 1991; Hird et al., 1992), Indraratna and Redana (1997) extended the analysis based on the plane strain solution to include explicitly the effects of smear and well resistance. Although a single-drain analysis is often performed to model the soil behaviour along the embankment centerline (symmetric geometry), multi-drain analysis is essential to study the overall behaviour of a soft clay foundation underneath the embankment. This paper presents a plane strain, multi-drain analysis for a selected case history from Malaysia, along the North-South Expressway built on the Muar coastal plain. REVIEW OF VERTICAL DRAIN THEORIES Equal Vertical Strain Hypothesis Conventional procedure for predicting radial consolidation was first introduced by Barron (1948). Barron developed the exact (rigorous) solution of vertical drain based on ‘free strain hypothesis’ and an approximate solution based on ‘equal strain hypothesis’. The difference in the predicted pore water pressures calculated using the free strain and equal strain assumptions is shown to be small. The schematic illustration of a soil cylinder with a central vertical drain is given in Figure 1, in which the radius of the drain is rw, the radius of smear zone is rs, the radius of soil cylinder is R, and l is the length of the drain. The coefficient of permeability in the vertical and horizontal directions are kv and kh, respectively, and ′ kh is the coefficient of permeability in the smear zone. The three dimensional consolidation equation for radial drainage is given by (Barron, 1948): 1 Professor, Civil Engineering Division, University of Wollongong, NSW 2522, Australia 2 Senior Lecturer, Udayana University, Dept. of Civil Engineering, Denpasar, Bali, Indonesia 3 PhD Student, Civil Engineering Division, University of Wollongong, NSW 2522, Australia ∂ ∂ ∂ ∂ ∂ ∂ ∂ ∂ u t c u z c u r r u r v h =       + +       2" @default.
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• W313893430 date "2000-11-19" @default.
• W313893430 modified "2023-09-28" @default.
• W313893430 title "Predicted And Observed Behaviour Of Soft Clay Foundations Stabilised With Vertical Drains" @default.
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