Blast Induced Crack Propagation and Damage Accumulation in Rock Mass Containing Initial Damage

Wang, Yixian; Wang, Siyao; Zhao, Yanlin; Guo, Panpan; Liu, Yan; Cao, Ping

doi:10.1155/2018/3848620

Cited by 10 publications

(8 citation statements)

References 39 publications

(42 reference statements)

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“…where p is the seepage pressure, k(Θ, p) is the hydraulic conductivity, and u s is the storage coefficient. e influence of seepage pressure and stress field on the hydraulic conductivity can be presented as [27,28] k(Θ, p) � ξ k 0 e − (Θ/3− βp) , (5) where k 0 is the initial value of the hydraulic conductivity, k(Θ, p) is the hydraulic conductivity by means of coupling analysis, Θ � σ 1 + σ 2 + σ 3 is the volumetric stress, ξ is the sudden jump coefficient of the hydraulic conductivity, and β is the coefficient. In coupling analysis, for elastic units, the hydraulic conductivity is looked as the negative exponential function of the volumetric stress.…”

Section: Water-proof Rock Pillar Instabilitymentioning

confidence: 99%

“…In China, there have been thousands of casualties in groundwater-related coal mine accidents since 2000. Among underground engineering accidents, including water rush [1][2][3][4], gas explosion [5], rock burst [6][7][8], and time-dependent large deformation [8][9][10], the groundwater inrush in coal mines is second only to gas explosion in causing catastrophic accidents according to government statistics (State Administration of Coal Mine Safety 2008). Mining depths and mining intensity have increased, causing the encountered hydrogeological conditions to become more complicated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Linkage Analysis between Solid-Fluid Coupling and the Strength Reduction Method for Karst Cave Water Inrush in Mines

Zhao

Liao

Liu

et al. 2020

Shock and Vibration

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The present paper aims to study the mechanical mechanism and characteristics of water irruption from Karst cave. Combining the nonlinear seepage-pipe coupling model with the strength reduction method, the linkage analysis of fluid solid coupling and strength reduction method are constructed to study the whole process of confined Karst cave water inrush. Taking the water inrush accident of Shibaijing of the Qiyi mine in south China as an example, the instability mechanism of the water-proof rock pillar and evolution of water inrush are discussed. It is suggested that water discharge on the working face augments with the increase in the reduction factor of the water-proof rock pillar before the rock pillar loses its stability. Once the rock pillar becomes unstable, Karst water bursts from confined Karst cave in a pipe flow shape, and the water irruption quantity reaches the peak value in a short time by adopting the pipe flow to simulate and then decreases slowly. The hydraulic rough flow at the initial stage changes into pipe laminar flow finally in the process of Karst water inrush, due to the constraint of Karst cave water reserve. The conception for the safety factor of the water-proof rock pillar introduced, the relation of the safety factor, Karst cave water pressure, and thickness of the water-proof rock pillar are studied. It is proposed that thickness of the water-proof rock pillar whose safety factor equals 1.5 is regarded as the calculating safety thickness of the water-proof rock pillar, and the safety thickness of the water-proof rock pillar setting in mining engineering should be equal to the sum of the blasthole depth, blasting disturbance depth, and the calculating safety thickness. The reason leading to Karst water inrush of Qiyi Mine is that without advanced boreholes, the water-proof rock pillar is set so small that it could not possess safety margin, so the confined Karst cave water breaks the water-proof rock pillar and bursts out. Combining the solid fluid coupling theory, pipe flow theory, and strength reduction method, the nonlinear mechanical response of confined Karst cave water inrush is studied, which provides a new study method for the whole process of confined Karst cave water inrush.

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Section: Water-proof Rock Pillar Instabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Linkage Analysis between Solid-Fluid Coupling and the Strength Reduction Method for Karst Cave Water Inrush in Mines

Zhao

Liao

Liu

et al. 2020

Shock and Vibration

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“…(24), the increment of the nonlinear damage strain, caused by wing crack propagation can be obtained. Thus, the damage deformation is time-dependent due to creep propagation of wing crack [21,22].…”

Section: Damage Deformation Caused By Crack Creep Fracturementioning

confidence: 99%

The double Burgers model of fractured rock masses considering creep fracture damage

Zhao¹,

Liu²,

Tang³

et al. 2019

J. vibroeng.

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Creep fracture of rock cracks is responsible for the creep failure of fractured rock masses. To capture creep fracture behaviors of fractured rock, we investigated the time-dependent characteristics of the rock crack propagation. The theoretical analysis shows that, similar to the rock creep process, the creep fracture of rock cracks includes the attenuation and steady creep stages. In addition, we established an equivalent Burgers model for creep fracture of rock cracks by introducing the equivalent stress and proposed a double Burgers model to study creep behaviors of fractured rock masses. Moreover, the proposed double Burgers model was embedding into FLAC3D, using FISH function. The numerical simulations on the specimens, containing ordered and random cracks, show that the creep fracture is responsible for the creep damage of fractured rock masses; moreover, the lateral creep damage is larger than the axial creep damage.

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“…Many scholars concentrate on the dynamic propagation of fractures or small-scale approximate tests [16,17,18] . The large-scale physical testing of anchored caverns under blast load is expensive and requires time.…”

Section: Introductionmentioning

confidence: 99%

Distribution of Cracks in an Anchored Cavern Under Blast Load Based on Cohesive Elements

Luo

Pei

et al. 2021

Preprint

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To explore the distribution of cracks in anchored caverns under the blast load, cohesive elements with zero thickness were employed to simulate crack propagation through numerical analysis based on a similar model test. Furthermore, the crack propagation process in anchored caverns under top explosion was analysed and the distribution and mode of propagation of cracks in anchored caverns when a fracture with different dip angles was present in the vault were discussed. With the propagation of the explosive stress waves, cracks successively occur at the boundary of the anchored zone of the vault, arch foot, and floor of the anchored caverns. Tensile cracks are preliminarily found in rocks surrounding the caverns. In the case that a pre-fabricated fracture is present in the upper part of the vault, the number of cracks at the boundary of the anchored zone of the vault decreases, then increases with increasing dip angle of the pre-fabricated fracture. The fewest cracks at the boundary of the anchored zone occur if the dip angle of the pre-fabricated fracture is 45º. The wing cracks deflected to the vault are formed at the tip of the pre-fabricated fracture, around which tensile and shear cracks are synchronously present. Under top explosion, both the peak displacement and peak particle velocity in surrounding rocks of anchored caverns reach their maximum values at the vault, successively followed by the side wall and the floor. In addition, they show asymmetry with the difference of the dip angle of the pre-fabricated fracture; the vault displacement of anchored caverns is mainly attributed to the formation of tensile cracks at the boundary of the anchored zone generated due to tensile waves reflected from the free face of the vault. When a fracture is present in the vault, the peak displacement of the vault decreases while the residual displacement increases.

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Blast Induced Crack Propagation and Damage Accumulation in Rock Mass Containing Initial Damage

Cited by 10 publications

References 39 publications

Linkage Analysis between Solid-Fluid Coupling and the Strength Reduction Method for Karst Cave Water Inrush in Mines

Linkage Analysis between Solid-Fluid Coupling and the Strength Reduction Method for Karst Cave Water Inrush in Mines

The double Burgers model of fractured rock masses considering creep fracture damage

Distribution of Cracks in an Anchored Cavern Under Blast Load Based on Cohesive Elements

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