Numerical stress-deformation analysis of cut-off wall in clay-core rockfill dam on thick overburden

Liu, Si Hong; Wang, Liu jiang; Wang, Zijian; Bauer, Erich

doi:10.1016/j.wse.2016.11.002

Cited by 33 publications

(6 citation statements)

References 2 publications

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“…This includes the engineering and scientific characterization of these parameters by using available techniques and monitoring physical performance in their natural environment. Such physical data present the most important issues while evaluating the safety and performance of both concrete and embankment formation dams (Liu et al 2016). These issues are movement, water pressure, seepage, reservoir and tail water elevations, local seismic activity, total pressure, stress, strain, internal concrete and environmental temperature, and precipitation (Jansen 1983;ICOLD 1992).…”

Section: Introductionmentioning

confidence: 99%

Monitoring the deformation and strain analysis on the Ataturk Dam, Turkey

Yavaşoğlu

Kalkan

Tiryakioğlu

et al. 2017

Geomatics, Natural Hazards and Risk

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Every man-made structure creates certain risks -dams are no exception. Most failures in man-made structures that have occurred could have been avoided if the structures' behaviour had been inspected, monitored, and analyzed continuously, and if proper corrective measures had been taken in a timely fashion. The DSI (The General Directorate of State Hydraulic Works), which is the institution responsible for dam safety, has long used surveying methods to measure the displacements of geodetic points as a part of dam monitoring policy. In this study, we focus on the dam's mechanical behaviour throughout a time period of more than 10 years. These study results have been derived from a separate, ongoing project that has monitored deformation on the Ataturk Dam and is now determining the water level of the reservoir. The project results show that although the dam body has become more stable and the water load behind the dam has increased, the rate of displacement of the dam has declined significantly. From these results, it can be seen that the reservoir water level can be increased evenly over time and that 542 m is the maximum water level of the dam's reservoir.

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Section: Introductionmentioning

confidence: 99%

Monitoring the deformation and strain analysis on the Ataturk Dam, Turkey

Yavaşoğlu

Kalkan

Tiryakioğlu

et al. 2017

Geomatics, Natural Hazards and Risk

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show abstract

“…In order to verify the capability and feasibility of the proposed constitutive model, it was incorporated into the hydro-mechanical coupling FEM code [48] that was developed in the Institute of Hydraulic Structures of Hohai University [49,50]. The explicit stress-integration algorithm for unsaturated soils proposed by Sheng et al [51,62] was used for the numerical implementation of the proposed constitutive model.…”

Section: Model Validationsmentioning

confidence: 99%

“…The conceptual bases for the model and the basic formulation are given in Section 2. Thereafter, the proposed model is incorporated into the coupled flow-deformation analysis FE code [48][49][50][51] using the explicit stress integration algorithm for the elastoplastic model of unsaturated soils [52,53]. Finally, the comparisons are conducted using the experimental data from a series of triaxial tests on saturated and unsaturated rockfill materials, and the capability of the proposed model to capture the state-dependent behaviour and collapse deformation is validated.…”

Section: Introductionmentioning

confidence: 99%

A State-Dependent Constitutive Model for Unsaturated Rockfill Materials

Wang¹,

Fu²

2021

Dam Engineering - Recent Advances in Design and Analysis

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This chapter presents a state-dependent elastoplastic constitutive model for both saturated and unsaturated rockfill materials. The model, which is developed within an extended critical-state framework, uses two independent stress state variables: total stress and total suction. The loading-collapse (LC) curve proposed by Oldecop and Alonso for unsaturated rockfills is used herein. A unified hardening parameter, which could consider the effects of stress level, internal state (density) and relative humidity, is introduced to describe the state-dependent dilatancy of saturated and unsaturated rockfill materials. The details of the model formulation and parameters determination are described and reported. Numerical simulations on the triaxial tests, such as the drained shear tests on the saturated specimens with different initial dry densities, shear tests on the specimens with different relative humidity and wetting deformation tests under constant vertical strain rate, have been carried out using the proposed model. The numerical results show that the stress-strain relationships at both loose and dense, saturated and unsaturated states can be properly modelled with a single set of parameters. Additionally, the proposed model can also capture some other key features such as the strain-softening behaviour at the dense state and low confining stress, the sudden stress relaxing subjected to the flooding under a constant vertical strain.

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“…Currently, the commonly used intrinsic models for Earth and rock dam calculations are the nonlinear elastic model and the elastoplastic model [7]. Because the parameters of the elastoplastic model are difficult to obtain and the calculation process is very complicated, the Duncan-Chang model (Duncan-Chang E-B model or Duncan-Chang E-υ model) among the nonlinear elastic models is often used to analyse the structural properties of dams [8], where not only the Duncan-Chang E-B model reflects the main deformation laws of the soil but also each of its parameters has a clear physical and geometrical meaning. Also, its parameters can be obtained not only by conventional triaxial shear tests simply [9] but also by intelligent algorithms for an inverse analysis.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Study of the Computational Parameters for the Deformation of Homogeneous Earth Dams

Sun

Shen

et al. 2021

Mathematical Problems in Engineering

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The deformation of dams has always been the focus of dam safety research. To more accurately study the effect of the Duncan–Chang model on the deformation of homogeneous Earth dams, this paper simulates the displacement variation of a homogeneous Earth dam through the finite element method based on the Duncan–Chang E-B model. The sensitivity of the Duncan–Chang E-B model parameters and the dam material density on the displacement of a homogeneous earthen dam in Gansu Province, China, were investigated using single-factor and multifactor analysis methods. The results show that the displacement variation of the dam during the completion and operation periods is consistent with the general rule for Earth and rock dams; the three parameters R f , φ 0 , and Δ φ are more sensitive to dam deformation; and the three parameters m , n , and K are less sensitive to dam deformation.

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Numerical stress-deformation analysis of cut-off wall in clay-core rockfill dam on thick overburden

Cited by 33 publications

References 2 publications

Monitoring the deformation and strain analysis on the Ataturk Dam, Turkey

Monitoring the deformation and strain analysis on the Ataturk Dam, Turkey

A State-Dependent Constitutive Model for Unsaturated Rockfill Materials

Sensitivity Study of the Computational Parameters for the Deformation of Homogeneous Earth Dams

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