Life-time prediction for rocks under static compressive and tensile loads: a new simulation approach

Konietzky, Heinz; Heftenberger, A.; Feige, M.

doi:10.1007/s11440-009-0085-4

Cited by 33 publications

(8 citation statements)

References 6 publications

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“…Table 1 shows the used concrete material parameters. The distribution of initial micro-cracks in the concrete model is shown in Figure 2 and Table 2 (Charles, 1958;Konietzky et al, 2009). Figure 3 and Table 3 show that after 60 days 20 hours 20 minutes 51 seconds can be seen 30 failure elements.…”

Section: Numerical Simulation Resultsmentioning

confidence: 98%

“…The subcritical crack growth simulation and lifetime prediction of the concrete material under load are based on the 2D finite-difference code FLAC (Itasca, 2019). The lifetime prediction of concrete material is based on the idea proposed by (Konietzky et al, 2009) for rocks under static load. It is assumed that each zone contains microcracks of different elongation according to a given probability distribution.…”

Section: Lifetime Predictionmentioning

confidence: 99%

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Study of the micro-crack growth in the concrete material to predict its lifetime

Vietnam¹

2021

JMES

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The concrete always contains microstructures like micro-crack, voids, etc. These parameters affected the lifetime of materials. This article presents a computation algorithm to predict the lifetime of brittle materials like concrete which depends on the distribution of micro-crack in the materials. The proposed model is based on subcritical crack growth using the linear elastic fracture mechanics (LEFM) approach. The algorithm considers both tensile and shear fracturing. The proposed model was applied to a concrete sample under compressive loading for the prediction of a lifetime. The results showed a significant difference in failure zones and failure time under different magnitude compressive loadings and initial crack length.

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Section: Numerical Simulation Resultsmentioning

confidence: 98%

Section: Lifetime Predictionmentioning

confidence: 99%

Study of the micro-crack growth in the concrete material to predict its lifetime

Vietnam¹

2021

JMES

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“…Golshani et al [186] developed a micromechanics-based numerical model to examine the time-dependent microcracking and the evolution of the excavation damage zone (EDZ) around an opening. Konietzky et al [187] proposed a numerical cellular automata approach based on subcritical crack propagation to predict the rock lifetime. Main [163] further developed the mean-field theory of damage mechanics and suggested a simple damage mechanics model for the apparently trimodal behavior of the strain and event rate dependence, by invoking a phase of strain hardening involving distributed crack damage and a phase of strain softening involving crack interaction and coalescence.…”

Section: Rock Damage and Failure Under Rheological Loadmentioning

confidence: 99%

Numerical Simulation on Damage and Failure Mechanism of Rock under Combined Multiple Strain Rates

Zhu

Wei

Niu

et al. 2018

Shock and Vibration

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During underground hard-rock mining, the drilling and blasting method currently remains the most economical excavation method, and the rock may experience a multistrain-rate spectrum under quasi-static, dynamic, and rheological loading conditions and their combination as well. The study on the damage mechanism of rock under multistrain-rate condition that induced by mining excavation is the fundamental issue for predicting the mining-induced hazards such as rockburst. In this study, the state of the art of rock damage and failure under different strain rates is reviewed first. Then, the numerical model for rock failure under multiple strain rates is formulated when the rock damage is taken as the main thread. Meanwhile, we summarize our work in this area over the past ten years, and the constitutive law for the damage and failure of rock under multistrain rates is presented. Finally, several numerical examples, i.e., rock damage and failure under combined static and dynamic load, rock damage and failure triggered by dynamic stress redistribution due to excavation, rock damage and failure induced by blasting, and rock damage and failure due to the combination of dynamic disturbance and rheological load, are presented. Based on these numerical simulations, the associated rock damage mechanism and failure behaviors under differently combined multiple strain rates are clarified, which may provide a theoretical basis for clarifying the rock failure mechanism during rockbursts and rock blasting. Also, further studies on the damage and failure of rock under multiple strain rates are suggested.

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“…How to model the creep fracture has been an important and tough problem. So far, many theoretical creep models have been proposed, for example, the phenomenological models [1][2][3] and the micromechanicsbased models [4][5][6][7][8][9][10][11][12]. In these models, the constitutive relation is derived from some time-dependent mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Modeling Creep Fracture in Rock by Using Kelvin Discretized Virtual Internal Bond

Zhang

2018

Advances in Civil Engineering

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Discretized virtual internal bond (DVIB) is a lattice model, which is composed of bond cells. Each bond cell has a finite number of bonds. The DVIB is used to model the creep fracture. It is done by introducing a viscous bond to the original hyperelastic DVIB. The hyperelastic bond is parallel coupled with a viscous bond together, forming a hybrid hyperelastic-Kelvin bond. The hyperelastic bond reflects the microfracture mechanism, whereas the viscous bond reflects the creep mechanism. Based on this hyperelastic-Kelvin bond, the constitutive relation of a cell is derived. The microbond parameters are calibrated based on the ideal cell approach. The simulation results suggest that this method can represent the typical features of creep and can simulate the creep fracture. The merit of this method lies in that the complicated 3D macrocreep problem is reduced to the 1D microbond creep problem. No creep law is previously derived. The macrocreep fracture behavior is the natural response of the assembly of the micro hyperelastic-Kelvin bonds.

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Life-time prediction for rocks under static compressive and tensile loads: a new simulation approach

Cited by 33 publications

References 6 publications

Study of the micro-crack growth in the concrete material to predict its lifetime

Study of the micro-crack growth in the concrete material to predict its lifetime

Numerical Simulation on Damage and Failure Mechanism of Rock under Combined Multiple Strain Rates

Modeling Creep Fracture in Rock by Using Kelvin Discretized Virtual Internal Bond

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