Analysis of the behavior of a high earth-core rockfill dam considering particle breakage

Liu, Sihong; He, Wen; Sun, Yi; Shen, Chong; Wang, Liujiang

doi:10.1016/j.compgeo.2023.105320

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…The maximum pore water pressure created ten years after the end of construction has been observed in the lower levels of and the middle part of the clay core (the place where the core is connected to the foundation). In table (5) shows the values of pore water pressure in sections C, B and D obtained from electric piezometers (VP) Casagrande piezometers (SP) and of numerical analysis. The maximum value of pore water pressure obtained from piezometers and numerical analysis is 420 and 450 (Kpa) respectively.…”

Section: Table4 Vertical Stresses In Cross Sectionsmentioning

confidence: 99%

“…To assess the deformations of the Madani Dam, 17 inclinometers (I) and 275 Magnetic settlement detector (SD) have been used at different levels of the dam body. In figure (5) showed the vertical settlement of the dam body resulting from the numerical analysis. In table (3) showed the values of the vertical settlement obtained from the magnetic settlement detector and numerical analysis in five cross sections.…”

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confidence: 99%

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Analysis and monitoring of behavior Rockfill dam ten years after end of construction ,Case study- Madani dam

Poursorkhabi,

Farajnia,

Zarean

et al. 2024

Preprint

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The purpose of research is to compare monitoring results with those result of numerical analysis and to present plan for the first reservoir impounding of the Rockfill dam ten years after end of constructing the dam body. The stability of dam body has been examined using the results of numerical analysis and the values obtained from the sensors installed in the dam. The correctness and accuracy of the geotechnical parameters of the dam body materials were confirmed by comparing the results of numerical analysis and monitoring based on back analysis. The linear correlation coefficients between the data obtained from the sensors and the numerical analysis results for the items of settlement, pore water pressure and total stress are 84, 67 and 99 %, respectively. The compatibility between the numerical analysis results, design assumptions, and instrumentation results were examined. The value of the arching ratio obtained from the results of instrumentation and numerical analysis in the core of the dam is 0.47 and 0.35, respectively, which indicates the safety of the dam. Ultimately, numerical sensitivity analyses was carried out for presente special impounding program for dam with controlling simultaneous two items the pore water pressure and effective stress changes in the clay core, with ten years passed since the completion of construction dam body.

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Section: Table4 Vertical Stresses In Cross Sectionsmentioning

confidence: 99%

mentioning

confidence: 99%

Analysis and monitoring of behavior Rockfill dam ten years after end of construction ,Case study- Madani dam

Poursorkhabi,

Farajnia,

Zarean

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…where the total breakage, Bt, represents the area between the initial particle size distribution curve and the current distribution curve, denoted as Areadbcd; Bp represents the breakage potential, that is, the area between the initial particle size distribution curve and the boundary at d = 0.075 mm, denoted as Areaabca. While the utilization of Br as an indicator effectively assessed the overall extent of particle breakage, it lacked utility in discerning specific breaking modes prevalent during the compression process, such as abrasion, crushing, and cracking [56,57].…”

Section: Relative Breakage Indexmentioning

confidence: 99%

“…where f(d) represents the mass fraction of particles < d in size; dmax represents the upper limit of particle size; and α represents the fractal dimension. Performing logarithmic processing on Equation (3) yields: While the utilization of B r as an indicator effectively assessed the overall extent of particle breakage, it lacked utility in discerning specific breaking modes prevalent during the compression process, such as abrasion, crushing, and cracking [56,57].…”

Section: Fractal Dimensionmentioning

confidence: 99%

Investigation on the Confined Breakage Characteristics of Calcareous Sand in the South China Sea Integrated Using Relative Breakage Ratio and Fractal Dimension

Zhu,

Zheng,

Yang

2024

Sustainability

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Calcareous sand, ubiquitous in the geotechnical makeup of the South China Sea, exhibits both compressibility and vulnerability to fragmentation when subjected to external loading, spanning a spectrum from typical to extreme conditions. This investigation aims to quantitatively assess the compression and particle breakage characteristics of calcareous sand under varied parameters, including relative density, saturation, applied loads, and loading paths, specifically focusing on sustainable geotechnical methodologies. Through a series of confined compression tests, this evaluation employed the relative breakage ratio and fractal dimension as key evaluative metrics. The results indicated that employing this integrated approach offered a more comprehensive understanding of calcareous sand breakdown mechanisms than relying on a singular particle breakage index. Furthermore, an increase in relative density can induce a transition in particle contact behavior, shifting from point-to-point interactions to face-to-face contact, thereby reducing inter-particle stress and minimizing grain breakage, particularly under loads below 200 kPa. Increasing loads exacerbated particle breakage, with finer particles predominantly initiating this process. During reloading, pore ratios across various load levels surpass those observed during initial loading, except at 1600 kPa, where a decline in pore ratio was noted, coinciding with pore water extrusion and the onset of new particle fracturing. The lubricating effect of water reduces inter-particle friction, enhancing stress concentration at particle edges and localized particle breakage, thereby increasing the presence of finer particles without significantly altering the overall structure. Notably, the influence of pore water pressure is evident during the reloading phase. These findings contribute to a refined theoretical framework for predicting coastal erosion risks and devising effective environmental protection strategies for sustainable coastal engineering practices.

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Determination of future creep and seismic behaviors of dams using 3D analyses validated by long-term levelling measurements

Cavuslu,

Inyurt

2024

J Civil Struct Health Monit

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This study aims to assess the future structural performance of the Kozlu-Ulutan clay core rockfill (CCR) dam, one of the most significant water structures in the Black Sea region of Turkey, by utilizing 35 years of levelling measurements and 3D finite-difference analyses. Settlement measurements were obtained from five different points on the dam surface every 6 months. Subsequently, a three-dimensional (3D) model of the dam was created using the finite-difference method. Time-dependent creep analyses and seismic analyses were conducted sequentially, employing the Burger-Creep and Mohr–Coulomb material models, respectively. Non-reflecting boundary conditions were defined for the boundaries of the dam model. The 3D numerical analysis results were found to be highly compatible with the 35 years of levelling measurements. Additionally, the future seepage and settlement behaviors of the dam over a 100-year period (2023–2123) were analyzed, considering special time functions. Current and future seismic analyses were performed, taking into account the settlement results of the dam in 2023 and 2123. For seismic analyses, data from ten various earthquakes that occurred in Kahramanmaraş, Hatay, Malatya, and Gaziantep in Turkey in 2023 were utilized. The seismic analysis results provided significant information about the future seismic behavior of the Kozlu-Ulutan Dam, revealing notable differences between the current and future earthquake behaviors of the dam. Moreover, it was concluded that the clay core is the most crucial section concerning the current and future seismic behaviors of CCR dams. The study results emphasized the importance of continuous monitoring and periodic seismic evaluations for the safe operation of CCR dams.

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Analysis of the behavior of a high earth-core rockfill dam considering particle breakage

Cited by 9 publications

References 29 publications

Analysis and monitoring of behavior Rockfill dam ten years after end of construction ,Case study- Madani dam

Analysis and monitoring of behavior Rockfill dam ten years after end of construction ,Case study- Madani dam

Investigation on the Confined Breakage Characteristics of Calcareous Sand in the South China Sea Integrated Using Relative Breakage Ratio and Fractal Dimension

Determination of future creep and seismic behaviors of dams using 3D analyses validated by long-term levelling measurements

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