Abstract
The deformation of dams has always been the focus of dam safety research. To more accurately study the effect of the Duncan–Chang model on the deformation of homogeneous Earth dams, this paper simulates the displacement variation of a homogeneous Earth dam through the finite element method based on the Duncan–Chang E-B model. The sensitivity of the Duncan–Chang E-B model parameters and the dam material density on the displacement of a homogeneous earthen dam in Gansu Province, China, were investigated using single-factor and multifactor analysis methods. The results show that the displacement variation of the dam during the completion and operation periods is consistent with the general rule for Earth and rock dams; the three parameters R f , φ 0 , and Δ φ are more sensitive to dam deformation; and the three parameters m , n , and K are less sensitive to dam deformation.
Highlights
Dams are large and important engineering facilities that relate to millions of cubic metres of water and, due to the presence of various external and internal loads, are bound to generate corresponding horizontal and vertical motions.ese movements, known as deformations, may lead to catastrophic damage when they reach certain critical limits, for example, leading to the complete collapse of a dam [1].erefore, it is necessary to numerically simulate and monitor the dam deformation to see if it is in a safe range
A static analysis model reflecting the Earth and rock dam is constructed through the finite element method analysis procedure to solve the displacement variation of the dam; a sensitivity analysis of the calculation parameters affecting the deformation of the homogeneous Earth dam is conducted from both single-factor and multifactor aspects in order to provide a reference for the selection of parameters for the simulation of the deformation of the homogeneous loess dam
It can be determined that the results of both are completely consistent and the three parameters Rf, φ0, and Δφ are more sensitive to the vertical displacement and the upstream horizontal displacement, while Rf, Δφ, and ρ are more sensitive to the downstream horizontal displacement
Summary
Dams are large and important engineering facilities that relate to millions of cubic metres of water and, due to the presence of various external and internal loads, are bound to generate corresponding horizontal and vertical motions. Sun et al and Yan et al performed a sensitivity analysis of the parameters of the Duncan–Chang E-B model for concrete panel rockfill dams in an orthogonal test and analysed the results using the extreme difference analysis method and the analysis of variance method [25, 26]. A static analysis model reflecting the Earth and rock dam is constructed through the finite element method analysis procedure to solve the displacement variation of the dam; a sensitivity analysis of the calculation parameters affecting the deformation of the homogeneous Earth dam is conducted from both single-factor and multifactor aspects in order to provide a reference for the selection of parameters for the simulation of the deformation of the homogeneous loess dam. E main parameters mentioned in the abovementioned formulas are C, φ, Δφ, Rf, K, Kb, n, m, Kur, and nur, all of which can be determined through conventional triaxial tests
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