Construction of Concrete-Faced Rockfill Dams with Weak Rocks

Xing, Huaizhong; Gong, Xiaonan; Zhou, Xiaoguang; Fu, Haifeng

doi:10.1061/(asce)1090-0241(2006)132:6(778)

Cited by 47 publications

(17 citation statements)

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“…When there is only one total plastic strain direction, the relationship among plastic coefficients must meet the following condition: 0 = − BC AD . Based on multi-potential surface theory, the following relation can be established: (23) where k φ (k = 1, 2, 3) is three mathematical potential functions which are independent of the linear gradient vector, only in the (p, q) space, it can be treated as a twodimensional issue, and in this case, k = 1, 2, the simplest potential functions can be expressed as: 1 …”

Section: Stress-strain Matrix [D Pq ]mentioning

confidence: 99%

“…The concrete-faced rockfill dam (CFRD) is a form of rockfill dam consisting of cushion, transition, main rockfill, and downstream rockfill zones [1]. In recent decades, CFRDs have been widely applied for their multiple advantages, such as good safety, better adaptability to topography and geology, application of local materials, cost-effectiveness, simple construction and short construction periods [2].…”

Section: Introductionmentioning

confidence: 99%

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The application of nonlinear dilatancy model in stress and deformation analysis of high concrete faced rockfill dam

et al. 2015

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Original scientific paper The concrete-faced rockfill dam (CFRD) is a widely applied geotechnical structure. The stress and deformation conditions of CFRD are absolutely critical for the safety of dam. However, only a few constitutive models have been reported to appropriately simulate and predict the specific stress and deformation of high CFRDs. In this paper, a new nonlinear dilatancy constitutive model was introduced to analyze CFRDs. Based on the generalized potential theory, the stress-strain matrix [Dpq] for the nonlinear dilatancy mode was also demonstrated. The numerical simulation result by the nonlinear dilatancy model was compared with that by a large-scale tri-axial compression test. It is concluded that the behaviours of rockfill materials can be well simulated by the nonlinear dilatancy model. In addition, the nonlinear dilatancy model was applied to simulate the step-by-step construction and impounding of the reservoir process in the Chinese Shuibuya CFRD. From comparative studies of the numerical results and in-situ monitoring data, a good agreement can be explored between the measured and computed settlements. This result also indicates that a 3D finite element analysis based on the nonlinear dilatancy model can be applied to predict the stress and deformation of CFRDs. Keywords: FEM; high concrete face rockfill dam; monitoring; nonlinear dilatancy model; settlement Primjena modela nelinearne dilatancije u analizi naprezanja i deformacije visoke nasute brane obrađene betonomIzvorni znanstveni članak Nasuta brana obrađena betonom (CFRD) je široko rabljena geotehnička konstrukcija. Uvjeti naprezanja i deformacije takve brane su apsolutno bitni za sigurnost brane. Međutim, poznato je samo nekoliko konstitutivnih modela kojima je moguće odgovarajuće simulirati i predvidjeti specifično naprezanje i deformaciju visoke CFRD. U ovom se radu uvodi novi konstitutivni model nelinearne dilatancije u analizi CFRD-a. Također se, na temelju generalizirane potencijalne teorije, demonstrira matrica naprezanja-deformacije [Dpq] za nelinearnu dilatanciju. Rezultat numeričke simulacije modelom nelinearne dilatancije uspoređen je s rezultatom dobivenim primjenom opsežnog troosnog ispitivanja na tlak (large-scale tri-axial compression test). Zaključeno je da se ponašanje materijala za nasipanje može dobro simulirati modelom nelinearne dilatancije. Uz to, model nelinearne dilatancije primijenjen je za simulaciju gradnje korak-po-korak i postupak postepenog punjenja kineske brane Shuibuya. Usporednom analizom numeričkih rezultata i kontrolnih podataka s lica mjesta, ustanovljeno je prilično slaganje između izmjerenog i proračunatog slijeganja. Taj rezultat također pokazuje da se 3D analiza konačnih elemenata temeljena na modelu nelinearne dilatancije može primijeniti za predviđanje naprezanja i deformacije nasutih brana obrađenih betonom. Ključne riječi: FEM; model nelinearne dilatancije; nadgledanje; slijeganje; visoka nasuta brana obrađena betonom

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Section: Stress-strain Matrix [D Pq ]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The application of nonlinear dilatancy model in stress and deformation analysis of high concrete faced rockfill dam

et al. 2015

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“…Compared with conventional rockfill materials such as fragments of hard rock, soft rocks are more sensitive to weathering, with temperature and drying/wetting variations. As there are limited applications of soft rocks used in high rockfill dams, 3–5 the long‐term behavior of the compacted soft rocks is of great concern and is not yet well understood 6–8…”

Section: Introductionmentioning

confidence: 99%

Development of a Soft-Rock Weathering Test Apparatus

Zhang

Sun

2011

Experimental Techniques

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This paper presents a weathering test apparatus developed for testing the deformation and shear strength behavior of rockfill materials for high dams under coupling actions of drying/wetting cycles, cooling/heating cycles, and vertical loads. The apparatus was integrated with a vertical load unit, a lateral shear unit, a drying/wetting circulation unit, and a cooling/heating circulation unit. A cell was designed to perform direct shear tests under normal pressures up to 5.5 MPa after long‐term weathering associated with wide variations in temperature and moisture content. It accommodates specimens 150 mm in diameter and 150 mm in height. The related experimental procedures and calibration of the device are discussed. Results of tests performed on an argillaceous siltstone used as the rockfill material for a 261.5 m high dam are presented in order to highlight the features of the apparatus and the weathering effects on soft rock.

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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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confidence: 99%

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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Construction of Concrete-Faced Rockfill Dams with Weak Rocks

Cited by 47 publications

References 1 publication

The application of nonlinear dilatancy model in stress and deformation analysis of high concrete faced rockfill dam

The application of nonlinear dilatancy model in stress and deformation analysis of high concrete faced rockfill dam

Development of a Soft-Rock Weathering Test Apparatus

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

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