Anisotropic damage coupled modeling of saturated porous rock

Lu, Yingfa; Wu, Xinxing; Shao, Jian‐Fu

doi:10.1007/s11431-010-4083-4

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…In [59][60][61][62], by treating the existing defects or cracks in dam as the structural damage variable, the evolution of these defects and the effects on dam safety were studied. In addition, Lu et al [63] and Deng et al [64] also studied the failure of concrete dam under multi-field coupling situation, like seepage-stress coupling and temperature-stress coupling, with the damage mechanics theory. The damage mechanics theory can reveal the fracture and failure mechanism in some extent, but either isotropic or anisotropic damage model treats the material as homogeneous, with which the shape and size of crack in concrete can not be analyzed.…”

Section: The Damage Mechanism Of Dam Concrete and Foundation Rockmentioning

confidence: 99%

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Research advance in failure risk and local strength failure for high arch dams

Ren

Liu

2012

Chin. Sci. Bull.

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To develop national economy and use the water resources and hydropower resources sufficiently, a lot of high arch dams, with the height of more than 200 m, have been and will be built in China. Although arch dams have good mechanical behavior, there is still failure possibility due to the huge water pressure and high stress level in dam, complex topographic and geologic conditions, formidable environment and high intensity earthquake. As one of the three main aspects concerning the safety of high arch dam, the study on global destruction, has been elaborated in the literatures, and research advance in the other two aspects, namely the failure risk and local damage of high arch dams, will be reviewed in this paper. In recent years, the failure risk of high arch dams has been investigated, and the model for identifying dam failure risk factors has been established. It is shown that the foundation deterioration and strong earthquake are the major risk sources for high dam failure. With the fault tree method, the failure mode and failure probability of high arch dams are studied, and the principle for determining failure mode and the method of calculating failure probability are proposed. Meanwhile, the determination principle of acceptable risk standard for high arch dam was proposed, and the acceptable risk rate and the acceptable standard value of various risk losses were given. For the local damage of arch dam, it is pointed out that the local damage belongs to the strength failure at material level. The study on local failure mechanism of arch dam is reviewed, based on the theories that from traditional strength theory to damage mechanics and meso-mechanics theory. Aiming at the cracking, the main pattern of local failure of high concrete dam, the research advances in the analysis methods and cracking criteria for smeared crack model and discrete crack model are summarized, and the research findings of preventive measures for local failure are shown. high arch dam, failure risk, local damage, research advance Citation:Ren Q W, Li Q, Liu S. Research advance in failure risk and local strength failure for high arch dams. Chin Sci Bull, 2012Bull, , 57: 46724682, doi: 10.1007 To develop national economy, to save energy and to reduce emission, exploitation and utilization of water resources and hydropower resources are continued in China. At present, the height of arch dams under construction and to be built are of 300 m high level, such as Jinping arch dam (305 m high), Xiaowan arch dam (294.5 m high), Xiluodu arch dam (285.5 m high), and Baihetan arch dam (289 m high). The construction scale and difficulty of these dams are beyond the current design specifications, and there is hardly successful precedential reference. Moreover most of these high arch dams are located in the western region of China, where the topographic and geologic conditions are quite complex, with harsh environment and high seismic intensity as well as frequent geological disasters. In addition the resistance of dam and foundation may be red...

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Section: The Damage Mechanism Of Dam Concrete and Foundation Rockmentioning

confidence: 99%

“…Many factors would cause local damage in high arch dam [61,63,135,136], especially cracking. From dam shape design, foundation excavation and reinforcement, concrete pouring and temperature control to loading action, all of these affect the cracking of concrete.…”

Section: Preventive Measures Of Local Damagementioning

confidence: 99%

Research advance in failure risk and local strength failure for high arch dams

Ren

Liu

2012

Chin. Sci. Bull.

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“…Generally, damage is anisotropic in nature due to oriented distribution of microcracks [11], and the damage variable is a tensor and damage criterion is more complicated. However, for the sake of simplicity, an isotropic damage state is assumed here and is represented by a scalar internal variable, denoted by d. The interested reader can refer to [7] for a survey of the field .…”

Section: Formulation Of the Modelmentioning

confidence: 99%

A coupled elasto-plastic-damage mechanical model for marble

Zhou

Zhang

Feng

2011

Sci. China Technol. Sci.

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A profound understanding of the mechanical behaviors of marble is very important for the design and construction of deep diversion tunnels in Jinping II hydropower station. In this paper, a coupled elasto-plastic-damage mechanical model is presented for Jinping marble. Firstly, the experimental investigations on Jinping marble are summarized. Then, based on the framework of continuum damage and plastic theories, a general mechanical model is proposed to predict the mechanical responses of Jinping marble. The proposed model is used to simulate the triaxial compressive tests, and there is a general good agreement between experimental data and numerical predictions in a qualitative manner. The proposed model is able to capture the main features of Jinping marble observed in experiments, such as progressive yielding process, damage induced by plastic distortion, dilation, elastic degradation and stress sensitivity. mechanical model, damage, elasto-plastic coupling, marble Citation:Zhou H, Zhang K, Feng X T. A coupled elasto-plastic-damage mechanical model for marble.

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“…The changes of seepage field and stress field caused by water level change need to be simulated by the numerical analysis method for the coupled unsteady seepage and stress fields [2][3][4][5][6][7][8]. In this paper, a mathematic model will be established for coupled unsteady seepage and stress fields in the fractures network of dam foundation.…”

Section: Introductionmentioning

confidence: 99%

Coupling analysis of unsteady seepage and stress fields in discrete fractures network of rock mass in dam foundation

Jaturapitakkul

2011

Sci. China Technol. Sci.

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The drag force of water flow through single fracture and the coupling characteristics of seepage and stress in single fracture surface are analyzed, and a three dimensional model of coupled unsteady seepage and stress fields is proposed. This model is used to the analysis of foundation rock mass of a high dam. If the coupling effects are considered, the changes of boundary heads have less influence on the inner head of rock mass, and the strong permeability of main fractures appears. If the coupling effects are not considered, the fractures distribution affects the inner head more greatly. When the upstream water head declines, the inner head of dam foundation slightly declines and the hydraulic gradient distribution becomes smoother. A bigger upstream water level declining velocity has a stronger lag effect, meanwhile the values of stress components change more greatly. Therefore the upstream water level declining velocity directly affects the stability of rock mass in dam foundation and we should take into account the above factors to make sure the safety of the dam during reservoir level fluctuation period.hydraulic engineering, unsteady seepage, stress, coupling, fractures network, rock mass Citation:Chai J R, Xu W S. Coupling analysis of unsteady seepage and stress fields in discrete fractures network of rock mass in dam foundation.

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Anisotropic damage coupled modeling of saturated porous rock

Cited by 4 publications

References 28 publications

Research advance in failure risk and local strength failure for high arch dams

Research advance in failure risk and local strength failure for high arch dams

A coupled elasto-plastic-damage mechanical model for marble

Coupling analysis of unsteady seepage and stress fields in discrete fractures network of rock mass in dam foundation

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