Numerical analysis of the anti-seepage measures for high earth rockfill dam on deep overburden

Yan, Jun; Liu, Si Hong; Zhou, Bin

doi:10.4028/www.scientific.net/amm.170-173.1872

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…With equation (1) and the measured values of seepage pressure, the objective function for calibration of permeability coefficients can be established as follows:…”

Section: Calibration Methods For Permeability Coe Cientsmentioning

confidence: 99%

“…e nite element models are discretized using plane thermal element PLANE55. e nite element models for the 1 downstream water level. In this study, it is assumed that there is no water in the downstream river in dry season (as the water is transmitted from the water intake to the distant power plant).…”

Section: Analysis Of the Monitoring Data Of Seepage Pressure In The Smentioning

confidence: 99%

“…e seepage field in the whole concerned area can be analyzed using numerical simulation techniques, such as finite element method (FEM), and the effects of material composition, seepage characteristics of various materials, seepage control measures, and seepage boundary conditions on the seepage field can be investigated. erefore, numerical simulation has been extensively applied to seepage analysis of foundation seepage (e.g., [1][2][3][4][5][6][7][8]). e values of seepage parameters such as permeability coefficients have a great influence on the numerical simulation results of foundation seepage.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Sluice Foundation Seepage Using Monitoring Data and Numerical Simulation

Fan

Liu

et al. 2019

Advances in Civil Engineering

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For sluices built on soil foundations, seepage safety of the foundation is one of the most concerns during operation of sluices. Monitoring data could reflect the real seepage behavior in the foundation, but of which the shortcoming is that generally only the local seepage states can be measured. The seepage field in the whole foundation can be analyzed by numerical simulation. The permeability coefficients of the foundation materials significantly affect the numerical simulation results; however, it is difficult to accurately determine the values of permeability coefficients. In this paper, an approach based on response surface method (RSM) for calibration of permeability coefficients was proposed, and the efficiency of parameter calibration is improved by constructing the response surface equation instead of time-consuming finite element calculation of foundation seepage. The seepage in a sluice foundation was analyzed using monitoring data and numerical simulation. The monitoring data showed that the seepage pressure in the foundation periodically varies with high value in flood season and low value in dry season. After calibration of the permeability coefficients of the foundation materials using the measured seepage pressure, the seepage fields in the foundation for different water levels were numerically simulated to investigate the cause for the periodical variation of the seepage pressure and the seepage safety of the foundation was assessed with the calculated seepage gradients. The methods adopted in this study could be applied to seepage analysis for sluice foundations with similar geologic conditions and antiseepage measures.

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“…With equation (1) and the measured values of seepage pressure, the objective function for calibration of permeability coefficients can be established as follows:…”

Section: Calibration Methods For Permeability Coe Cientsmentioning

confidence: 99%

Section: Analysis Of the Monitoring Data Of Seepage Pressure In The Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of Sluice Foundation Seepage Using Monitoring Data and Numerical Simulation

Fan

Liu

et al. 2019

Advances in Civil Engineering

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“…Thus, the foundation seepage of dams constructed on deep alluviums has become an important issue that must be addressed. Concrete cut-off walls are considered to be a notable and effective seepage-prevention technique because of their high mechanical strength and low permeability (Yan et al , 2012). In addition, concrete cut-off walls are commonly constructed by directly inserting the wall into the earth core to maintain the integrity of the anti-seepage system (Mahinroosta et al , 2012).…”

Section: Introductionmentioning

confidence: 99%

Large-deformation finite element analysis of the interaction between concrete cut-off walls and high-plasticity clay in an earth core dam

Zou

Kong

et al. 2017

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Purpose A large, uneven settlement that is unfavourable to dam safety can occur between a concrete cut-off wall and the high-plasticity clay of earth core dam built on alluviums. This issue has been often studied using the small-strain finite element (FE) method in previous research. This paper aims to research the interaction behaviour between a concrete cut-off wall and high-plasticity clay using large-deformation FE analyses. Design/methodology/approach The re-meshing and interpolation technique with a small-strain (RITSS) method was performed using an independently developed program and adopted for large-deformation FE analyses, and a suitable element size for the high-plasticity clay region was suggested. The layered construction process of an earth core dam built on thick alluviums was simulated using the RITSS method incorporating a hyperbolic model for soil. Findings The RITSS method is an effective technique for simulating the soil–structure interaction during dam construction. The RITSS analysis predicted a higher maximum principle stress of the concrete cut-off wall and higher stress levels in the high-plasticity clay region than small-strain FE analysis. Originality/value A practical method for large-deformation FE analysis was advised and was used for the first time to study the interaction between a concrete cut-off wall and high-plasticity clay in dam engineering. Large deformation in the high-plasticity clay was handled using the RITSS method. Moreover, the penetration process of the concrete cut-off wall into the high-plasticity clay was captured using a favourable element shape and mesh density.

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“…These tests have focused on tensile properties and tension fracture phenomena of soil, though, but haven't considered confining pressure. To consider confining pressure, Zhang [6] developed a horizontal triaxial tester, carried out triaxial compression tests, triaxial extension tests, triaxial compression-extension combination tests with the Ruzhadu clay and Shuangjiangkou clay, which fills the core wall in the embankment dams. But some mechanical parameters can't be obtained by tests easily, and numerical tests have more advantages.…”

Section: Introductionmentioning

confidence: 99%

Macro-Micro Analysis of Soil Failure Mechanism in Unloading Condition

Liu

Yuan

Jiang

2012

AMM

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Numerical tests are carried out to research mechanism of hydraulic fracturing. As well as that: reservoir storage leads to bending of the embankment dam because of water pressure, especially upright core wall when reservoir storing rapidly, and then bending leads to vertical stress unload. The macro and micro mechanism of soil fracturing in unloading condition are analyzed by the Distinct Element Method (DEM). The results indicate that: (1) Initial stage of specimen will lead to volume response of dilatancy in the unloading condition. Actually, volume response is expressed as dilatancy consistently with the low level confining pressure and is expressed as dilatancy then compression latterly with the high level confining pressure. It suggests that the unloading condition may be a factor for granular material cracks. Particularly, not only the unloading condition with low level confining pressure leads to cracks, but also it helps the cracks development. So we argue that: unload condition, such as reservoir storage is a factor for hydraulic fracturing in the embankment dams, especially in low level stress areas. (2)The strength of soil in the unloading condition decreases than the loading condition, which contributes to hydraulic fracturing.

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Numerical analysis of the anti-seepage measures for high earth rockfill dam on deep overburden

Cited by 4 publications

References 6 publications

Analysis of Sluice Foundation Seepage Using Monitoring Data and Numerical Simulation

Analysis of Sluice Foundation Seepage Using Monitoring Data and Numerical Simulation

Large-deformation finite element analysis of the interaction between concrete cut-off walls and high-plasticity clay in an earth core dam

Macro-Micro Analysis of Soil Failure Mechanism in Unloading Condition

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