Simulation of collapse settlement of first filling in a high rockfill dam

Mahinroosta, Reza; Alizadeh, Anahita; Gatmiri, Behrouz

doi:10.1016/j.enggeo.2014.12.013

Cited by 38 publications

(17 citation statements)

References 22 publications

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“…This is due to unavoidable feature of embankment dam engineering, such as soil properties that may be affected by the weather or by the contractor's method of construction. As the result during first filling, the amount of the collapse settlement in rockfills depends on the quality of the material and the extent of its compaction [12]. With an increasing usage of poor grade rockfills, a significant settlement is becoming more common, which could lead to instability in the body of the dam and damage to rigid structures on the dam crest.…”

Section: Resultsmentioning

confidence: 99%

Displacement analysis of dam based on material parameters using numerical simulation and monitoring instrumentation

2019

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On the dams, there are many parameters may change and be different from design. Therefore, it is necessary to analyse the parameters so that it can comply with conditions in the field. By knowing the material parameters can foresee events in the future during operational condition of dam. It is because material parameters can influence behaviour of the structure. Displacement, one aspect in failure of dam, is considered due to its function to accommodate design of camber in dam crest and provide early warning system. Displacement behaviour is related to material parameters in term of Young’s modulus and Poisson ratio. Nevertheless, difficulties for testing material in the dam make approach method to analysis material parameters are required. One of them is done by numerical simulation. In this study, the review of displacement is in the core zone at different elevations and different water level conditions. Value of material parameters which influence displacement were determined using back analysis method. Then, it could be analysed displacement result between modelling and monitoring instrumentation using Settlement Gauge. Results show good agreement trend between those displacement’s results. Moreover, the displacement’s value from simulation model analysis is greater than Settlement Gauge.

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Section: Resultsmentioning

confidence: 99%

Displacement analysis of dam based on material parameters using numerical simulation and monitoring instrumentation

2019

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“…is event, usually called "collapse deformation," has been reported in different rockfill dams [22,23] and always causes discordant Advances in Civil Engineering deformation. en, the dam crest has a high possibility of cracking.…”

Section: Problems For Some High Core Rockfill Damsmentioning

confidence: 99%

Different Deformation Patterns in High Core Wall Rockfill Dams: A Case Study of the Maoergai and Qiaoqi Dams

Feng

Cao³

2019

Advances in Civil Engineering

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The time-dependent behaviour of high rockfill dams is complex and not easy to accurately predict. Many discrepancies were revealed by the comparison of the observed deformation histories of different dams, and the deformation of some high rockfill dams did not correspond to the general deformation law. Field monitoring is therefore an effective method for understanding complex dam deformation behaviour. In this paper, actual measured deformation data resulting from continuous monitoring of the Maoergai and Qiaoqi dams are analysed. These two dams have similar heights, crest lengths, and alluvium overburden thicknesses. Our aim is to explain the actual deformation histories on the basis of the mechanical behaviours of these dams in order to warn engineers about potential problems that cannot be predicted. The results indicate that the deformation patterns of the two dams are completely different. The dam construction and water impoundment schedule is the major reason for the different horizontal displacement patterns. The reservoir filling rates and rainfall are the main reasons for the different settlement patterns. The case histories are useful for understanding the wide range of possible postconstruction deformation in a dam.

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“…According to Fig.12 which is a hypothetical stress path, when a dry rockfill medium is submerged, internal stresses decrease vertically from its initial value t  to the collapse stress c  , therefore, this coefficient, Cc equals the ratio t c   / . Dependency of the collapse phenomenon to confining pressure has been observed by a number of researchers [50,52,[60][61][62]. So, this coefficient was defined as function of confining stress [50].…”

Section: Sequences Of Modelingmentioning

confidence: 99%

“…Other researchers used the porous media mechanics and unsaturated soil frameworks to develop other methods with similar objectives [47][48][49]. Recently, Mahinroosta and Alizadeh[50] used a concept called "stress reduction factor" to develop a practical technique for modeling the collapse settlement incorporated with a hardening/softening constitutive model [51], in the framework of saturated soil mechanics .This technique was used to simulate the collapse settlement of the rockfill shell of the Gotvand Dam, the highest rockfill dam located in Iran [52]. The Masjed-e-Soleyman(MES) dam is currently the second highest rock fill dam in Iran.…”

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“…These materials have had extensive use in the body of rockfill dams [e.g. [1][2][3][4][5][6][7], the subgrade of roads as well as a wide variety of other engineering structures. The high shear strength of these materials enables the embankments to maintain steeper slopes.The strength and deformation behaviors of rockfill materials are conventionally investigated through large-scale triaxial tests [e.g.…”

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The Deformation Mechanism of a High Rockfill Dam during the Construction and First Impoundin

Akhtarpour

Salari

2018

Scientia Iranica

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Abstract:The Masjed-e-Soleyman dam is a high rockfill dam with clay core, located in Iran. During construction and first impounding, a considerably high excess pore water pressure has been developed inside the core and has been being dissipated with a very slow rate, so the consolidation deformations have been insignificant. However, there have been reports of noticeable internal deformations in the dam, the crest has also exhibited quick settlements during the first impounding. The main objective of this paper was to identify the deformation mechanism of this dam. For this purpose, the data recorded by its instruments were carefully studied and then a three-dimensional numerical model of the dam was developed. The mechanical behavior of materials was idealized by a hardening strain constitutive model. A numerical method was proposed, based on this constitutive model and Rowe's stress-dilatancy theory, to simulate the deformation behavior of coarse-grained materials, like rockfills, due to particle size distribution, particle breakage, rotation, and rearrangement under shearing. The results show that significant development of pore pressure in the core and its insignificant dissipation, plastic shear deformations inside the core and extensive collapse settlements of the upstream shell are the main causes influencing the deformation mechanism. Keywords: high rockfill dam, hardening strain constitutive model, particle breakage, collapse settlement. IntroductionRockfill materials consist of sharp-edged aggregates obtained by blasting in rock borrow areas or rounded or sub-rounded aggregates excavated from river beds. These materials have had extensive use in the body of rockfill dams [e.g. [1][2][3][4][5][6][7], the subgrade of roads as well as a wide variety of other engineering structures. The high shear strength of these materials enables the embankments to maintain steeper slopes.The strength and deformation behaviors of rockfill materials are conventionally investigated through large-scale triaxial tests [e.g. 8-15]. The mechanical behavior of granular materials can be simulated via a variety of constitutive models, such as non-linear elastic model [16], elastoplastic hardening model [17][18][19], and strain softening elasto-plastic model [20]. It used to be a common practice to simulate the behavior of rockfill materials by linear or non-linear elastic models [21,22], but there are now a variety of advanced constitutive elasto-plastic models based on the disturbed state concept [11,23,24] and critical state concept [ 25,26] that can be used for modeling these materials. Previous laboratory researches have revealed that particle size distribution (PSD), particle breakage, rotation, and rearrangement has significant effects on the strength and deformation behaviors of coarse-grained material [e.g.10, 14, 27-31]. There have been several creditable efforts to incorporate the impacts of these phenomena into mechanical constitutive models; these include the works carried out based on disturbed state concept [24] an...

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Simulation of collapse settlement of first filling in a high rockfill dam

Cited by 38 publications

References 22 publications

Displacement analysis of dam based on material parameters using numerical simulation and monitoring instrumentation

Displacement analysis of dam based on material parameters using numerical simulation and monitoring instrumentation

Different Deformation Patterns in High Core Wall Rockfill Dams: A Case Study of the Maoergai and Qiaoqi Dams

The Deformation Mechanism of a High Rockfill Dam during the Construction and First Impoundin

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