Development and verification of three-dimensional equivalent discrete fracture network modelling based on the finite element method

Wu, Na; Zhao, Liang; Zhang, Zhenghu; Li, Shaohong; Lang, Yingxian

doi:10.1016/j.enggeo.2022.106759

Cited by 51 publications

(21 citation statements)

References 53 publications

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“…The AE events correlate well with the number of failed elements. The failure process is accompanied by a rapid increase in the AE event count [32][33][34]. Figure 6b shows the evolution of the fracture and maximum principal stress field.…”

Section: Failure Analysis Of Single Inclusion Under Uniaxial Compressionmentioning

confidence: 99%

Simulation of the Fracturing Process of Inclusions Embedded in Rock Matrix under Compression

Gong

et al. 2022

Applied Sciences

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Typical parallel fractures are often observed in the outcrops of inclusions in the field. To reveal the failure mechanism of inclusions embedded in rock matrix, a series of heterogeneous models are established and tested based on the damage mechanics, statistical strength theory, and continuum mechanics. The results show that, with the spacing between two adjacent fractures decreasing, the stress is firstly transferred from negative to positive, then from positive to negative. Stress transition is profound for the fracture spacing. Meanwhile, three types of fractures, i.e., consecutive fracture, non-consecutive fracture, and debonding fracture, are found, which are consistent with the observed modes in the field. Multiple inclusions are often fractured easier than an isolated inclusion due to the stress disturbance between inclusions and newly generated fractures. Either in single or multiple inclusions, tensile stresses inside the inclusions are the main driving force for fracture initiation and propagation. Besides, although the material heterogeneity has a small effect on the stress variation, it has an evident impact on the fracturing mode of inclusions. The stiffness ratio is critical for the stress transition and failure pattern; the interface debonding occurs earlier than the fracture initiation inside the inclusion when the stiffness ratio is relatively high. Additionally, the inclusions content only affects the sequence of fracture initiation rather than the final fracture spacing pattern.

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Section: Failure Analysis Of Single Inclusion Under Uniaxial Compressionmentioning

confidence: 99%

Simulation of the Fracturing Process of Inclusions Embedded in Rock Matrix under Compression

Gong

et al. 2022

Applied Sciences

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“…The work performed by the external loads on the rock not only causes a change in reversible elastic strain energy of the rock but also is irreversibly dissipated, resulting in damage accumulation and ultimately failure of the rock (Xie et al, 2011;Cui et al, 2021;Zhou et al, 2021). From the viewpoint of thermodynamics, the damage evolution of rock is an irreversible process of energy dissipation, and the failure of rocks is attributed to energy-driven state instability (Brady and Brown, 2006;Wang et al, 2020;Li et al, 2022;Wu et al, 2022). Therefore, quantization of dissipated energy is very important to study the damage and failure process of rock.…”

Section: Introductionmentioning

confidence: 99%

A model for rock dissipated energy estimation based on acoustic emission measurements

et al. 2023

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The temporal domain of dissipated energy during rock damage and failure is commonly quantified using loading and unloading tests or elastic mechanics-based theoretical calculation methods. However, these approaches cannot be applied to obtain the spatial distribution of rock dissipated energy. This paper presents a novel model to estimate rock dissipated energy based on acoustic emission measurements. The proposed model is used to estimate the temporal and spatial distribution of dissipated energy in a sandstone specimen under uniaxial compression conditions. The results indicate that the model well describes the energy dissipation evolution trend in the temporal domain with an error of 38.63% compared with results calculated using the traditional method. The dissipated energy concentration area estimated by the model is located near the macroscopic fractures, which indicates that the model can describe the evolution process of rock energy dissipation in the spatial domain.

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“…However, the unit's spatial arrangement is significantly different due to the disorder of the microscopic structure. This disorder at the microscopic level simply reflects the rock's unique discrete characteristics (Tang, 1997;Tang and Kaiser, 1998;Tang et al, 2003;Chen et al, 2021b;Chen et al, 2021c;Wu et al, 2022).…”

Section: Introduction To Rfpa Softwarementioning

confidence: 99%

Study of deformation law and support design feasibility of right-angled trapezoidal roadways

2023

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Given the problems of serious asymmetric deformation and the difficulty in supporting right-angled trapezoidal roadways during the mining process, we established a mechanical model of surrounding rock for a right-angled trapezoidal roadway, determined the relationship between the deflection and tilt angle of the roadway roof, and determined that the typical failure mode of right-angled trapezoidal roadways is the upper slip of the high side. Two optimized support schemes are proposed, in which a constant resistance large deformation (CRLD) bolt + ordinary I-steel or a portal energy absorbing hydraulic (PEAH) support + ordinary bolt is used as the main support instead of an ordinary bolt + ordinary I-steel. Numerical simulation analysis shows that the aforementioned optimized support schemes can reduce the deformation, acoustic emission (AE) quantity, and AE energy of rock surrounding roadways and change how surrounding rock releases energy from main earthquake type to swarm earthquake type. The support scheme with CRLD bolt + ordinary I-steel or PEAH support + ordinary bolt as the main support can reduce the deformation of a roadway’s high side to 0.192 and 0.145 m, respectively. This shows that the two optimized schemes can effectively improve the overall bearing capacity and integrity of the rock surrounding roadways, which can be applied in the field.

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Development and verification of three-dimensional equivalent discrete fracture network modelling based on the finite element method

Cited by 51 publications

References 53 publications

Simulation of the Fracturing Process of Inclusions Embedded in Rock Matrix under Compression

Simulation of the Fracturing Process of Inclusions Embedded in Rock Matrix under Compression

A model for rock dissipated energy estimation based on acoustic emission measurements

Study of deformation law and support design feasibility of right-angled trapezoidal roadways

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