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Coupled Seepage–Stress Analysis of Selected Roller-Compacted Concrete Gravity Dam with Upstream Impervious Layer Considering the Seepage Behavior of Interface Thickness
https://orcid.org/http://orcid.org/0000-0003-1222-4274
The characteristic of seepage through the roller-compacted concrete gravity dams (RCCDs) is inhomogeneous, anisotropic and significantly different from the seepage through conventional gravity dams. This is due to the internal interfaces formed by thin rolling of layers which are weak links and the main channels for seepage. The provision of an upstream impervious layer (UIL) or less pervious upstream layer may efficiently reduce the excessive seepage in RCCDs. Several works such as those of Li et al. (Water Sci Eng 8(4):326–334, 2015) considered the upstream less pervious layer constructed with different concrete materials; however, the properties of interface thickness have not been included in their analysis. The present study attempts to carry out a seepage analysis of RCCDs with an upstream less pervious layer of different types of concrete materials including three-graded RCC, two-graded RCC, conventional vibrate concrete and grout-enriched vibrated RCC with a thickness of 2–3 m considering the significant properties of interface layers, viz. thickness and permeability. The results of the analysis emphasize the effect of less pervious upstream layer or UIL thickness on controlling seepage and also facilitate in understanding its effect on stresses. The property of RCC considered as inhomogeneous multi-laminated medium can be described by tangential and normal major coefficients of the permeability of the layer which depend on the coefficient of permeability and the thickness of the layer following cubic law. These properties are expected to simulate the seepage behavior of RCCD, and also the changes in the mechanical properties such as the elastic modulus with time and temperature are considered to predict the stress behavior of the structure. RCC dams are more pervious than conventional concrete dams and seepage through the dam exerts pore pressure throughout the body of the dam. From the point of its significance, considering the effect of seepage as body force is more realistic than considering it as an external force, viz. uplift pressure at the base of the dam. This method of analysis also facilitates in carrying out stress analysis of dam and foundation together. Hence, a coupled seepage–stress interaction is carried out while analyzing the selected section of RCCD with and without UIL using ABAQUS software. The results provide essential parameters such as pore pressure, stresses required to select the thickness and material of anti-seepage structure.
Coupled Seepage–Stress Analysis of Selected Roller-Compacted Concrete Gravity Dam with Upstream Impervious Layer Considering the Seepage Behavior of Interface Thickness
https://orcid.org/http://orcid.org/0000-0003-1222-4274
The characteristic of seepage through the roller-compacted concrete gravity dams (RCCDs) is inhomogeneous, anisotropic and significantly different from the seepage through conventional gravity dams. This is due to the internal interfaces formed by thin rolling of layers which are weak links and the main channels for seepage. The provision of an upstream impervious layer (UIL) or less pervious upstream layer may efficiently reduce the excessive seepage in RCCDs. Several works such as those of Li et al. (Water Sci Eng 8(4):326–334, 2015) considered the upstream less pervious layer constructed with different concrete materials; however, the properties of interface thickness have not been included in their analysis. The present study attempts to carry out a seepage analysis of RCCDs with an upstream less pervious layer of different types of concrete materials including three-graded RCC, two-graded RCC, conventional vibrate concrete and grout-enriched vibrated RCC with a thickness of 2–3 m considering the significant properties of interface layers, viz. thickness and permeability. The results of the analysis emphasize the effect of less pervious upstream layer or UIL thickness on controlling seepage and also facilitate in understanding its effect on stresses. The property of RCC considered as inhomogeneous multi-laminated medium can be described by tangential and normal major coefficients of the permeability of the layer which depend on the coefficient of permeability and the thickness of the layer following cubic law. These properties are expected to simulate the seepage behavior of RCCD, and also the changes in the mechanical properties such as the elastic modulus with time and temperature are considered to predict the stress behavior of the structure. RCC dams are more pervious than conventional concrete dams and seepage through the dam exerts pore pressure throughout the body of the dam. From the point of its significance, considering the effect of seepage as body force is more realistic than considering it as an external force, viz. uplift pressure at the base of the dam. This method of analysis also facilitates in carrying out stress analysis of dam and foundation together. Hence, a coupled seepage–stress interaction is carried out while analyzing the selected section of RCCD with and without UIL using ABAQUS software. The results provide essential parameters such as pore pressure, stresses required to select the thickness and material of anti-seepage structure.
Coupled Seepage–Stress Analysis of Selected Roller-Compacted Concrete Gravity Dam with Upstream Impervious Layer Considering the Seepage Behavior of Interface Thickness
https://orcid.org/http://orcid.org/0000-0003-1222-4274
The characteristic of seepage through the roller-compacted concrete gravity dams (RCCDs) is inhomogeneous, anisotropic and significantly different from the seepage through conventional gravity dams. This is due to the internal interfaces formed by thin rolling of layers which are weak links and the main channels for seepage. The provision of an upstream impervious layer (UIL) or less pervious upstream layer may efficiently reduce the excessive seepage in RCCDs. Several works such as those of Li et al. (Water Sci Eng 8(4):326–334, 2015) considered the upstream less pervious layer constructed with different concrete materials; however, the properties of interface thickness have not been included in their analysis. The present study attempts to carry out a seepage analysis of RCCDs with an upstream less pervious layer of different types of concrete materials including three-graded RCC, two-graded RCC, conventional vibrate concrete and grout-enriched vibrated RCC with a thickness of 2–3 m considering the significant properties of interface layers, viz. thickness and permeability. The results of the analysis emphasize the effect of less pervious upstream layer or UIL thickness on controlling seepage and also facilitate in understanding its effect on stresses. The property of RCC considered as inhomogeneous multi-laminated medium can be described by tangential and normal major coefficients of the permeability of the layer which depend on the coefficient of permeability and the thickness of the layer following cubic law. These properties are expected to simulate the seepage behavior of RCCD, and also the changes in the mechanical properties such as the elastic modulus with time and temperature are considered to predict the stress behavior of the structure. RCC dams are more pervious than conventional concrete dams and seepage through the dam exerts pore pressure throughout the body of the dam. From the point of its significance, considering the effect of seepage as body force is more realistic than considering it as an external force, viz. uplift pressure at the base of the dam. This method of analysis also facilitates in carrying out stress analysis of dam and foundation together. Hence, a coupled seepage–stress interaction is carried out while analyzing the selected section of RCCD with and without UIL using ABAQUS software. The results provide essential parameters such as pore pressure, stresses required to select the thickness and material of anti-seepage structure.
Coupled Seepage–Stress Analysis of Selected Roller-Compacted Concrete Gravity Dam with Upstream Impervious Layer Considering the Seepage Behavior of Interface Thickness
Indian Geotech J
Meena, Chowdari (Autor:in) / Praveen, T. V. (Autor:in) / Siva Parvathi, I. (Autor:in)
Indian Geotechnical Journal ; 50 ; 634-645
01.08.2020
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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