Effect of Inclined Clay Core on Embankment Dam Seepage and Stability Through LEM and FEM

Salmasi, Farzin; Norouzi, Reza; Abraham, John; Nourani, Bahram; Samadi, Sima

doi:10.1007/s10706-020-01455-7

Cited by 24 publications

(9 citation statements)

References 21 publications

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“…Changes in soil pore water pressure may significantly affect the stability of structures, such as such as the slope [1,2], tunnel [3], and earth-rock dam [4]. The finite element method (FEM) is the dominant method for seepage problems [5][6][7][8]. However, this method is cumbersome when dealing with singularities.…”

Section: Introductionmentioning

confidence: 99%

A Novel Solution for Seepage Problems Implemented in the Abaqus UEL Based on the Polygonal Scaled Boundary Finite Element Method

et al. 2022

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The scaled boundary finite element method (SBFEM) is a semianalytical computational scheme based on the characteristics of the finite element method (FEM) and boundary element method that combines their respective advantages. In this paper, the SBFEM and polygonal mesh technique are integrated into a new approach to solve steady-state and transient seepage problems. The proposed method is implemented in Abaqus employing a user-defined element (UEL). A detailed implementation of the procedure is presented in which the UEL element is defined, the internal variables RHS and AMATRX are updated, and the stiffness/mass matrix is solved using eigenvalue decomposition. Several benchmark problems are solved to verify the proposed implementation. The results show that the polygonal element of the polygonal SBFEM (PSBFEM) is more accurate than the standard FEM element of the same element size. For transient problems, the results for the PSBFEM and FEM are in excellent agreement. Hence, the proposed method is robust and accurate for solving steady-state and transient seepage problems. The developed UEL source code and the associated input files can be downloaded from GitHub.

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Section: Introductionmentioning

confidence: 99%

A Novel Solution for Seepage Problems Implemented in the Abaqus UEL Based on the Polygonal Scaled Boundary Finite Element Method

et al. 2022

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“…Over the years, many scholars have carried out a lot of research on landslide failure mechanism and stability (Marino et al, 2020;Wasowski and Pisano, 2020;Zhang, 2020;Zhang et al, 2020;Ramesh, 2021;Zheng et al, 2021), considering the slope in water (Salmasi et al, 2020). Study the Impact of Climate Change on Landslides (Lin et al, 2020;Shan et al, 2020;Zheng et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Development Trend and Stability Analysis of Creep Landslide With Obvious Slip Zone Under Rainfall-Taking Xinchang Xiashan Basalt Slope as an Example

et al. 2022

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The creep slope is a dynamic development process, from stable deformation to instability failure. For the slope with sliding zone, it generally creeps along the sliding zone. If the sliding zone controlling the slope sliding does not have obvious displacement, and the slope has unexpected instability without warning, the harm and potential safety hazard are often much greater than the visible creep. Studying the development trend of this kind of landslide is of great significance to slope treatment and landslide early warning. Taking Xiashan village landslide in Huishan Town, Xinchang County, Zhejiang Province as an example, the landslide point was determined by numerical simulation in 2006. Generally, the landslide is a typical long-term slow deformation towards the free direction. Based on a new round of investigation and monitoring, this paper shows that there are signs of creeping on the surface of the landslide since 2003, and there is no creep on the deep sliding surface. The joint fissures in the landslide area are relatively developed, and rainfall infiltration will soften the soft rock and soil layer and greatly reduce its stability. This paper collects and arranges the rainfall data of the landslide area in recent 30 years, constructs the slope finite element model considering rainfall conditions through ANSYS finite element software, and carries out numerical simulation stability analysis. The results show that if cracks appear below or above the slope’s sliding surface, or are artificially damaged, the sliding surface may develop into weak cracks. Then, the plastic zone of penetration is offset; In the case of heavy rain, the slope can unload itself under the action of rainfall. At this time, the slope was unstable and the landslide happened suddenly.

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“…Numerical methods were first employed to calculate the seepage flux several decades age [15], and have developed rapidly since the improvement of computer performance in recent years. Usually, there are three main numerical methods for seepage simulation, namely, the finite element method (FEM) [16][17][18][19], the finite difference method (FDM) [20][21][22], and the boundary element method (BEM) [23][24][25][26]. Aldulaimi [16] adopted a numerical approach utilizing FEM to simulate the seepage field of an earthfill dam, and the approach was used to carry out seepage analysis on an earth dam in Iraq.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Method for Leakage Estimation of Clay Core Dams with Different Groundwater Levels

Yang

Shen

et al. 2022

Water

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Clay core dams are widely applied in reservoir construction, regulating water resource and provide electric power. Leakage is a common problem in reservoir construction, and the leakage amount, which not only affects the economic benefits of the project, but also relates to the safety of the dam body, is difficult to estimate. According to Darcy’s law and stable seepage theory, an analytical method can be proposed to calculate the leakage of the clay core dam to gain the seepage flux in a short time. By making some reasonable assumptions, we propose formulae for seepage calculation in different conditions of the position of the groundwater levels, below or above the reservoir bottom. Both sets of formulae contain two parts of leakage calculation, i.e., leakage from the reservoir bottom and leakage from the dam body. By using the proposed analytical method, the leakage of clay core dams can be estimated considering the influence of the groundwater level. To prove the rationality of the analytical method, a simple numerical model can be established using Geo-studio 2020 to calculate the seepage flux of the clay core dam, where relative errors between numerical solutions and analytical solutions are less than 10%. To verify the feasibility in engineering applications, the proposed method was applied to calculate the seepage of a clay core dam in Sichuan, China, which was also calculated using numerical methods by establishing a three-dimensional model. The results show the rationality of the analytical method, which can strike a balance between precision and efficiency.

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Effect of Inclined Clay Core on Embankment Dam Seepage and Stability Through LEM and FEM

Cited by 24 publications

References 21 publications

A Novel Solution for Seepage Problems Implemented in the Abaqus UEL Based on the Polygonal Scaled Boundary Finite Element Method

A Novel Solution for Seepage Problems Implemented in the Abaqus UEL Based on the Polygonal Scaled Boundary Finite Element Method

Development Trend and Stability Analysis of Creep Landslide With Obvious Slip Zone Under Rainfall-Taking Xinchang Xiashan Basalt Slope as an Example

A Simplified Method for Leakage Estimation of Clay Core Dams with Different Groundwater Levels

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