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• W1574308317 abstract "ABSTRACT In this study, the large-scale apparatus used to examine vacuum preloading in conjunction with conventional surcharge loading. Several tests were performed to examine the effect of a vacuum and determine parameters such as the extent of smear zone and the soil permeability characteristics. The settlement and excess pore pressure associated with a combined vacuum and surcharge load indicates that applying a vacuum has specific benefits. The analytical modeling of one-dimensional consolidation by vertical drains with vacuum preloading considering both variation of soil compressibility and permeability is used to predict the soil consolidation behavior. It is shown that the analytical model can reasonably predict the laboratory behavior. 1. INTRODUCTION Kjellman (1952) Introduced vacuum preloading method via vertical drains to improve the soft soil properties such as soil compressibility and shear strength. An effective stress in the soil mass is increased by the application of suction pressure (Qian et al. 1992). This method can accelerate the consolidation process without additional surcharge load. A system of vertical drains incorporating surcharge and vacuum preloading has been successfully applied in large highway and port projects (Indraratna et al. 2004, Chu et al. 2000). Mohamedelhassan and Shang (2002) discussed the application of vacuum pressure and its benefits, but without any prefabricated vertical drains (PVDs). In this paper, a series of large-scale testing is presented to study the effect of vacuum and surcharge load. Subsequently, an analytical solution for radial consolidation incorporating vacuum effect introduced by Indraratna et al. (2005) was employed to predict the vacuum consolidation responses. The advantages of vacuum-surcharge were discussed. 2. TEST APPARATUS AND SOIL PROPERTIES Figure 1 illustrates a schematic diagram of the large-scale radial drainage consolidation cell at the University of Wollongong. The main body of the cell consists of two stainless steel half sections (450 mm inside diameter by 950 mm high) with flanges either side that allows them to be bolted together. The cell stands on a steel base. In order to reduce the friction effect along the boundary of the cell a 1.5 mm thick, ultra smooth Teflon sheet (friction <0.03) was inserted around the internal circumference. The surcharge loading system with a maximum capacity of 1200 kN was applied by an air jack compressor system via a 50mm thick rigid piston, while a vacuum loading system with a maximum capacity of 100 kPa was applied through a hole in the centre of the rigid piston. The instrumentation, including a Linear Variable Differential Transducer (LVDT) and miniature pore pressure transducers, were installed to monitor the consolidation. The porous stone tips were saturated under vacuum and kept there using thin, adjustable, plastic tubes. The cell can also be equipped with a specially designed mandrel which enables a prefabricated vertical drain to be inserted vertically along the central axis of the cell. The amount of soil required for each sample for the large-scale consolidometer is about 0.14m" @default.
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• W1574308317 date "2008-01-01" @default.
• W1574308317 modified "2023-09-27" @default.
• W1574308317 title "Laboratory Modeling of Consolidation Behavior of Soft Clays Using Vacuum-Surcharge Consolidation Method" @default.
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