Hypoplastic constitutive modelling of the wetting induced creep of rockfill materials

Fu, Zhongzhi; Chen, Shengshui; Liu, SiHong

doi:10.1007/s11431-012-4835-4

Cited by 22 publications

(7 citation statements)

References 27 publications

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“…the deviation to the experimental results increases with an increase of the mean stress. Fu et al [32] showed that for different mean stresses and different stress ratios the experimental data can be largely approximated using a single hyperbolic function. The numerical simulations with the suggested approximation function, however, still show certain deviations from the experimental data.…”

Section: Influence Of the Stress Deviator On The Evolution Of The Crementioning

confidence: 99%

“…Great efforts have been made to investigate and to model the complex mechanisms of wetting deformations at the micro-and macro-level, e.g. [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

“…Such events are relevant for repeated changes in the moisture content of the rockfill material caused by local defects of the sealing and heavy rain water infiltration into the rockfill material of the dam body. While the focus of the present paper is on the theory of constitutive modeling and its calibration, the application of the proposed material model to different types of rockfill dams can be found for instance in [53][54][55][56]. Sowers et al [3]; (b) oedometric compression behavior of broken granite under dry and water saturated conditions and for different pre-compactions [27,28] (herein λ p denotes a measure of the relative pre-compaction energy).…”

Section: Introductionmentioning

confidence: 99%

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Long-Term Behavior of Coarse-Grained Rockfill Material and Their Constitutive Modeling

Bauer¹

2021

Dam Engineering - Recent Advances in Design and Analysis

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For the long-term behavior and safety assessment of rockfill dams, not only the shape of the dam body, the loading history, the geological condition of the dam foundation and abutments, the assessment of possible seismic hazards and seepage events caused by defects of the sealing are important, but also the time dependent mechanical behavior of the dam materials used can be of significant influence. In this paper a novel hypoplastic constitutive model for moisture sensitive, coarse-grained rockfill materials is presented. In the constitutive equations, the so-called solid hardness is a key parameter to reflect the influence of the state of weathering on the mechanical response. With respect to the evolution equation for the solid hardness, creep and stress relaxation can be modeled for dry and wet states of the material in a unified manner. The performance of the model is demonstrated by comparing the numerical simulation with experimental data.

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Section: Influence Of the Stress Deviator On The Evolution Of The Crementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long-Term Behavior of Coarse-Grained Rockfill Material and Their Constitutive Modeling

Bauer¹

2021

Dam Engineering - Recent Advances in Design and Analysis

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“…On the basis of nonlinear elastic constitutive model, Nobari and Duncan, 19,20 who used the curve fitting method to determine the wetting‐induced unbalanced stress, and simulated the collapse settlement of the Orovill Dam, firstly pioneered numerical simulation of dam collapse settlement; on the basis of elasto‐plastic constitutive model with two yield surfaces, Wei 21 proposed the wetting plastic model and calculated the wetting deformation of the Nuozhadu Dam. On the basis of hypo‐plastic constitutive model, Bauer 22,23 found that saturation changed the solid hardness, calculated the stress relaxation using the degradation of the hardness and simulated wetting deformation of dams by reducing the hardness during impoundment 24 . On the basis of nonlinear elastic constitutive model, Chi and Zhou 25 analyzed the law of wetting strain development during soaking in a single‐line triaxial wetting test, proposed a wetting model and simulated the rockfill dam wetting deformation during first impounding 26 …”

Section: Introductionmentioning

confidence: 99%

Study on collapse settlement and cracks of core wall rockfill dams under wetting deformation

Zhou¹,

He²,

Chi

et al. 2022

Num Anal Meth Geomechanics

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The safety and stability of core wall rockfill dams during impoundment are threatened by the wetting deformation of up-stream shell materials. The serious wetting deformation not only aggravates the collapse settlement of upstream rockfill but also intensifies differential settlement of the dam crest during impoundment, and then causes cracks on the dam crest. On the basis of the proposed wetting deformation model and its simulation method of wetting deformation, this paper simulated the impoundment process of Guanyinyan core wall rockfill dam and studied the deformation characteristic of the dam during impoundment. In addition, the smeared cracking model was used to simulate the crack propagation on the dam crest, and the crack develop and spread mechanism was analysed. The results show that the simulated deformation can fit the in-situ data well, and the simulated crack propagation is in good agreement with the actual situation. Once watered, the upstream rockfill and core wall have significant settlement, and the whole dam crest has obvious horizontal displacement towards the upstream. It is on the same order of magnitude that the increment of horizontal displacement and settlement at the top of the dam during impoundment. In the process of impoundment, the upper part of the dam tends to deform towards the reservoir area, which will lead to tensile cracks appearing in the rockfill areas on both upstream and downstream sides of the core wall of the dam crest, and the propagation direction of the cracks is basically parallel to the adjacent core wall surface. With the water level rising, the cracks on the downstream side of the dam crest mainly extend vertically, and the cracks on the upstream side of the dam crest not only extend vertically, but also extend horizontally.

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“…Wei proposed the wetting plastic model based on an elasto‐plastic constitutive model with two yield surfaces and calculated the wetting deformation of the Nuozhadu Dam. Bauer found that saturation changed the solid hardness, calculated the stress relaxation using the degradation of the hardness, and simulated wetting deformation of dams by reducing the hardness in a hypo‐plastic constitutive model during impoundment . Reza et al determined the stress reduction parameter during saturation by conducting triaxial wetting tests and simulated the Gotvand rockfill dam by reducing and reloading the stress determined by the reduction parameter.…”

Section: Introductionmentioning

confidence: 99%

Study on wetting deformation characteristics of coarse granular materials and its simulation in core‐wall rockfill dams

Zhou

Chi

Wang

et al. 2020

Num Anal Meth Geomechanics

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Summary The wetting deformation of coarse granular materials is often considered to be an important cause of the core wall rockfill dam cracks during impounding. By analyzing existing research results, this paper proposes a hyperbolic relationship between the wetting axial strain and wetting stress level and puts forwards a warped surface relationship among spherical stress, shear stress, and the ratio of wetting volumetric strain to wetting axial strain. To illustrate its practicability, the wetting strain model's parameter determination process is introduced and the rockfill materials wetting parameters are determined using the triaxial wetting test data. Moreover, the collapse settlement of Guanyinyan rockfill dam during first impounding is numerically simulated using the proposed method to calculate rockfill wetting deformation and verified by field measurements and monitoring data. The results show that the calculative method of wetting deformation proposed in this paper is reasonable and practical; the wetting deformation of upstream rockfill materials would cause an adverse deformation trend, which may lead to crack occurrence at the upstream slope and dam crest; and the Guanyinyan rockfill dam cracks on the top of junction mainly caused by the wetting deformation of upstream rockfill.

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Hypoplastic constitutive modelling of the wetting induced creep of rockfill materials

Cited by 22 publications

References 27 publications

Long-Term Behavior of Coarse-Grained Rockfill Material and Their Constitutive Modeling

Long-Term Behavior of Coarse-Grained Rockfill Material and Their Constitutive Modeling

Study on collapse settlement and cracks of core wall rockfill dams under wetting deformation

Study on wetting deformation characteristics of coarse granular materials and its simulation in core‐wall rockfill dams

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