A novel settlement forecasting model for rockfill dams based on physical causes

Chen, Chen; Lü, Xiang; Li, Junru; Chen, Jiankang; Zhou, Zhengjun; Peng, Liang

doi:10.1007/s10064-021-02403-2

Cited by 8 publications

(4 citation statements)

References 33 publications

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“…The reservoir s normal water storage level is set at 2540 m, with a capacity of 132.7 million m 3 . The dead water level is at 2460 m, and the verified flood level reaches 2541.09 m. On 21 September 2009, the first phase of the project began with water storage.…”

Section: Project Overviewmentioning

confidence: 99%

“…In the late 1960s, the emergence of heavy-duty vibratory rollers and multilayer roller compaction technologies greatly enhanced the compaction density of large-sized rockfill materials and effectively reduced the deformation of rockfill dams. This improvement led to the widespread use and rapid development of rockfill dams with good seismic performance constructed from locally available materials [3,4]. The successive commissioning and operation of the Nurek Core Gravel Dam (300 m) [5], Shiziping (136 m) [6], Pubugou (186 m), Nuozhadu (261.5 m) [7], Lianghekou (295 m), Shuangjiangkou (312 m), and other dams marks a significant breakthrough in the construction of high earth-rock dams.…”

Section: Introductionmentioning

confidence: 99%

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Research on Failure Modes and Causes of 100-m-High Core Wall Rockfill Dams

Li,

Zhang,

Yuan

et al. 2024

Water

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Rockfill dams are the most competitive type of dam in complex geological environments. Identifying the failure modes and causes in high dams over 100 m is critical for better guiding high dam designs and implementing safety prevention and control measures. To this end, this paper investigated numerous cases of earth–rock dam breaches and failure modes in rockfill dams globally, with a particular focus on dams over 100 m in height, encompassing all such dams in China. The study categorized dam failure modes based on whether the dams were built before or after 1980. It also examined the causes of dam failures in terms of dam height, foundation characteristics and thickness, and failure time. Additionally, the paper analyzed a rockfill dam in China, with a height of 136 m and over ten years of operation, as a case study. We analyzed the spatial and temporal characteristics and causes of failures, such as dam crest cracking, high-level seepage, and gallery cracking, using the design situation, monitoring data, and numerical simulation. The paper also addressed issues related to dam design and foundation treatment, providing recommendations for improvement. The study indicated that the overall risk of total failure for dams over 100 m is already low. However, longitudinal cracks on the dam crest, core wall seepage, hydraulic splitting, and seepage damage to the dam foundation are primary issues in the current high core wall rockfill dams. These issues are mainly caused by uneven structural deformation of the dam and its foundation. A reasonable design of rockfill materials and foundations can mitigate these failures.

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Section: Project Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Failure Modes and Causes of 100-m-High Core Wall Rockfill Dams

Li,

Zhang,

Yuan

et al. 2024

Water

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“…Zhao et al [20] used the particle swarm inversion algorithm combined with Adina to carry out an inversion analysis and research on the rockfill materials of Nuozhadu core wall rockfill dam. Chen [21] proposed a new settlement prediction model combined with parameter inversion, which had high deformation prediction accuracy for high rockfill dams. Li et al [22] proposed an FEM-Bayesian kriging (FBK) method which can effectively characterize the deformation behavior of earth dams.…”

Section: Introductionmentioning

confidence: 99%

Study on Impoundment Deformation Characteristics and Crack of High Core Rockfill Dam Based on Inversion Parameters

Pan,

Wu,

Wang

et al. 2024

Water

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In the numerical simulation of earth-rock dam, accurate and reliable mechanical parameters of the dam material are the important basis for dam deformation predictions and dam safety evaluations. Based on the deformation monitoring data of Luding core wall rockfill dam, the rheological parameters of rockfill and core wall materials are inverted in this paper. Combined with the actual filling and impoundment process of the dam, the numerical simulation is carried out, and the stress deformation and differential settlement of the dam after completion and impoundment are analyzed. The results showed that the stress deformation results of the dam based on the inversion parameters were in good agreement with the actual deformation. The horizontal displacement, settlement, and principal stress of the dam during the completion period were symmetrically distributed along the core wall. The maximum horizontal displacement occurred at the main dam on both sides of the core wall and the upstream and downstream dam slopes, and the maximum settlement occurred in the middle of the core wall. During the impoundment period, under the action of reservoir water pressure and upstream rockfill wetting deformation, the deformation and stress of the dam body no longer met the symmetrical distribution law, and the maximum horizontal displacement of the dam body during the impoundment period was located at 2/3 of the upstream dam slope. The maximum settlement of the dam body was located at 1/2 of the dam height. The maximum principal stress on the upstream side of the core wall was located on the left side of the bottom of the core wall, and the minimum principal stress was also located on the left side of the bottom of the core wall. The simulation results of the deformation and stress met the general law of earth-rock dam engineering. During the completion period, the deformation inclination of the dam crest was less than 1%. During the impoundment period, the deformation inclination of the dam crest area increased due to the wetting deformation of the upstream rockfill material. At the same time, the deformation inclination of the dam crest axis was larger than that of the upstream and downstream sides, and the deformation inclination of the dam crest at the middle of the valley was the largest, but it did not exceed 3%, that is, there would be no longitudinal cracks, which is consistent with the actual situation. The research results can better predict the stress deformation and crack of the dam body, and provide important support for dam safety evaluations.

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“…The kriging interpolation methods outperform the deterministic methods in that they account for the spatial correlation between the deformation of neighboring monitored locations and unmonitored locations [19,20]. However, the above interpolation methods all neglect the physical mechanism of dam deformation [21], so the accuracy of the deformation field estimation results encounter difficulties in trying to meet the requirements of dam safety monitoring.…”

Section: Introductionmentioning

confidence: 99%

Ordinary Kriging Interpolation Method Combined with FEM for Arch Dam Deformation Field Estimation

Shao

Chen

et al. 2023

Mathematics

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The deformation characteristic of the arch dam can directly reflect its service performance, which can be analyzed on the basis of the dam deformation field. However, restricted by the limited number of dam monitoring points and the inhomogeneity of materials, an accurate measurement of arch dam deformation field is difficult to estimate by using the existing common methods, such as the spatial interpolation methods and the finite element method (FEM). With the aim of ensuring arch dam structure safety, the ordinary kriging interpolation method, combined with FEM, is proposed for arch dam deformation field estimation, in this study. Given the inversion of the computation parameters of the arch dam, FEM is used to calculate the basic arch dam deformation. Subsequently, the ordinary kriging interpolation method is introduced to estimate the spatial variance deformation at each point of the arch dam. One superhigh arch dam in China is selected as a case study; two additional methods are introduced as comparisons that are based on a numerical experiment and the actual monitoring data. The experimental results show that the proposed method considerably improves the accuracy and computational efficiency of the arch dam deformation field estimation and that it is of great practical importance for characterizing the deformation behavior of arch dams.

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A novel settlement forecasting model for rockfill dams based on physical causes

Cited by 8 publications

References 33 publications

Research on Failure Modes and Causes of 100-m-High Core Wall Rockfill Dams

Research on Failure Modes and Causes of 100-m-High Core Wall Rockfill Dams

Study on Impoundment Deformation Characteristics and Crack of High Core Rockfill Dam Based on Inversion Parameters

Ordinary Kriging Interpolation Method Combined with FEM for Arch Dam Deformation Field Estimation

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