Nonlinear creep damage model considering effect of pore pressure and analysis of long-term stability of rock structure

Liu, Yaoru; Wang, Weiqiang; He, Zhu; Lyv, Shuai; Yang, Qiang

doi:10.1177/1056789519871684

Cited by 26 publications

(13 citation statements)

References 30 publications

(28 reference statements)

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“…The RVCs of the Xiluodu reservoir grow continually. There are many studies on the mechanisms of the RVCs [11,17,18]. However, none of these studies can explain the contraction phenomenon completely.…”

Section: Rvcs Of the Xiluodu Dammentioning

confidence: 99%

The Cause and Statistical Analysis of the River Valley Contractions at the Xiluodu Hydropower Station, China

Zhou

Chen

et al. 2020

Water

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The Xiluodu Dam is a concrete double-curvature arch dam with a crest elevation of 610 m and a height of 285.5 m. Since the impoundment of the Xiluodu reservoir, remarkable river valley contractions (RVCs) have been observed upstream and downstream of the reservoir, potentially threatening the safety of the dam. However, the cause of these RVCs remains unclear. Based on an analysis of hydrogeological conditions, the RVCs were determined a result of the expansion of the aquifer, within which the effective stress decreased due to an increase in the hydraulic head after reservoir impoundment. Referring to the hydrostatic seasonal time (HST) model, a groundwater hydrostatic seasonal (GHS) model is proposed for simulating and predicting the development of the RVCs. Unlike the HST model, the GHS model can provide information on aquifer hydraulic diffusivity. The calibration results illustrate that the GHS model can accurately fit the observed RVCs data. The calculation results revealed that the RVCs were mainly affected by the hydraulic head of the confined aquifer, and that seasonal effects gave rise to less than 10% of the total RVCs. Finally, the development of RVCs were predicted using the GHS model. The prediction results demonstrated that the RVCs of most monitoring lines in the Xiluodu reservoir would gradually approach a convergence condition after 6 February 2021. Until the deadline of the prediction on 1 May 2035, there is still one monitoring line that has not reached a convergence condition (whose RVCs are 157.6 mm, and where the RVC growth rate will decrease to 0.005 mm/d by that time). Considering the large amount of RVCs, we think the safety of the dam requires closer consideration.

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Section: Rvcs Of the Xiluodu Dammentioning

confidence: 99%

The Cause and Statistical Analysis of the River Valley Contractions at the Xiluodu Hydropower Station, China

Zhou

Chen

et al. 2020

Water

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“…Rocks may gradually accumulate damage deformation under external load, causing severe plastic deformation or even progressive failure (Krajcinovic et al, 1991;Liu et al, 2020;Su et al, 2019;Wang and Xu, 2020;Wu et al, 2019). The deformation and failure processes of rock, with many cracks and voids, are accompanied by energy release in the form of vast elastic waves (Ebrahimian et al, 2019;Feng et al, 2020;Hu et al, 2019;Wang et al, 2015;Xu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Study on mechanical properties and damage evolution of carbonaceous shale under triaxial compression with acoustic emission

Yang

Yan

Zhang

et al. 2021

International Journal of Damage Mechanics

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To explore the mechanical properties and damage evolution characteristics of carbonaceous shale with different confining pressures and water-bearing conditions, triaxial compression tests accompanied by simultaneous acoustic emission (AE) monitoring were conducted on carbonaceous shale rock specimens. The AE characteristics of carbonaceous shale were investigated, a damage assessment method based on Shannon entropy of AE was further proposed. The results suggest that the mechanical properties of carbonaceous shale intensify with increasing confining pressure and degrade with increasing water content. Moisture in rocks does not only weaken the cohesion but also reduce the internal friction angle of carbonaceous shale. It is observed that AE activities mainly occur in the post-peak stage and the strong AE activities of saturated carbonaceous shale specimens appear at a lower normalized stress level than that of natural-state specimens. The maximum AE counts and AE energy increase with water content while decrease with confining pressure. Both confining pressure and water content induce changes in the proportions of AE dominant frequency bands, but the changes caused by confining pressure are more significant than those caused by water content. The results also indicate that AE entropy can serve as an applicable index for rock damage assessment. The damage evolution process of carbonaceous shale can be divided into two main stages, including the stable damage development stage and the damage acceleration stage. The damage variable increases slowly accompanied by a few AE activities at the first stage, which is followed by a rapid growth along with intense acoustic emission activities at the damage acceleration stage. Moreover, there is a sharp rise in the damage evolution curve for the natural-state specimen at the damage acceleration stage, while the damage variable develops slowly for the saturated-state specimen.

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“…The morphology and mechanical properties of joints are important factors affecting the stability evaluation of rock mass engineering. Under natural conditions, the instability and failure of the joint does not occur within a short period of time, it is often caused by the creep phenomenon that internal stress and displacement field are constantly adjusted and reorganized with time, there is a long-term stress loading state before failure (Liu et al., 2018; Liu and Liu, 2017; Liu et al., 2020; Wu et al., 2017; Zhang et al., 2020). The deterioration of the mechanical properties of joints under creep condition is an important cause of disasters such as slope landslides and goaf collapse.…”

Section: Introductionmentioning

confidence: 99%

Damage evolution characteristics of saw-tooth joint under shear creep condition

Zhang

Lin

Wang

et al. 2020

International Journal of Damage Mechanics

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The creep characteristics of joint have an important influence on the long-term stability of rock mass engineering such as tunnels and slopes. In this paper, the sawtooth angle α is taken as the variable, five different numerical models of regular sawtooth joints are established using the discrete element numerical method, to study the shear mechanical characteristics of joints under creep condition. In addition, the shear mechanical properties of joints under transient condition are compared to analysis the influence of creep on the mechanical characteristics of joint. The results show that under shear creep condition: (1) Shear displacement of joint increases stepwise with time. At low sawtooth angles, the difference of joint shear displacement with different normal stresses is large. The long-term shear strength of joint is proportional to normal stress and sawtooth angle. (2) The total absorbed energy U and elastic energy Ue of the joint both increase as the sawtooth angle α increases. Dissipated energy Ud tends to increase first and then decrease with increasing sawtooth angle. Compared with the energy characteristics under transient condition, it is found that the joint under creep condition not only has a lower shear strength, but also requires less total absorbed energy and dissipative energy, and fewer cracks at critical failure. (3) Before the peak strength, the damage variable D increases nonlinearly with the shear displacement. Compared with the transient condition, the damage amount corresponding to the peak strength under the creep condition is smaller, and the evolution rate of the damage variable D with shear displacement at the critical failure is higher.

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Nonlinear creep damage model considering effect of pore pressure and analysis of long-term stability of rock structure

Cited by 26 publications

References 30 publications

The Cause and Statistical Analysis of the River Valley Contractions at the Xiluodu Hydropower Station, China

The Cause and Statistical Analysis of the River Valley Contractions at the Xiluodu Hydropower Station, China

Study on mechanical properties and damage evolution of carbonaceous shale under triaxial compression with acoustic emission

Damage evolution characteristics of saw-tooth joint under shear creep condition

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