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Numerical modeling of floating prefabricated vertical drains in layered soil
Ikhya Ikhya, Helmut Schweiger, 2012, original scientific article

Abstract: This paper presents a comparison of field measurements and a numerical model of settlements based on the construction of an embankment on soft soil for the Cirebon Power Plant Project in Indonesia, where prefabricated vertical drains (PVDs) were installed. In the numerical model, floating PVDs in two soil layers for two- and one-way drainage conditions are examined in order to determine the optimum penetration depth. In this study, good agreement between the field measurements of the settlements and the numerical prediction could be achieved. An interesting result of this study is that the differences in the stiffness and/or the permeability in the unimproved area below the PVD tip have a significant influence on the optimum penetration depth (L/H) in the two-soil-layer condition. The numerical study showed that it is possible to use floating PVDs in single drainage conditions if the second layer is stiffer and/or more permeable than the first layer.
Keywords: two soil layers, floating prefabricated vertical drain, double and single drainage, numerical model, soft clay, consolidation
Published in DKUM: 13.06.2018; Views: 1247; Downloads: 93
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Methods for control of seepage in RCC dams with wathertight and drainage measures
Yueming Zhu, Stephan Semprich, Erich Bauer, Cuiping Yuan, Dongmei Sun, 2006, original scientific article

Abstract: The technologies for construction of roller-compacted concrete (RCC) dams have been considerably developed during recent years in China. At the time being, they have been successfully applied to the constructions of even extreme-high gravity dams and medium to high arch dams. There are a few of hundreds of RCC dams (RCCD) under design and/or construction in China. One of the main concerned technical problems according to the construction is about the understanding of the property of seepage in RCCDs and the relevant theory and methods for the control of the seepage. In order to overcome the problem, the senior author has been engaged in a wide study on the property and methods for control of seepage in RCCDs for more than 10 years. The property of seepage, measures for watertightness and drainage, optimal design and construction schemes for control of seepage in the dams have been essentially understood either in theory and practice. The results have been applied for the construction and the backanalysis of several dams. The paper describes the research findings in detail with respect to the theoretical fundament and their application for a high RCC gravity dam.
Keywords: gravity dam, Roller-compacted concrete, RCC, seepage, anisotropic permeability, drainage
Published in DKUM: 17.05.2018; Views: 1308; Downloads: 56
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