Study on the Fracture Behavior of Cracks Emanating from Tunnel Spandrel under Blasting Loads by Using TMCSC Specimens

Liu, Bang; Zhu, Zheming; Liu, Ruifeng; Zhou, Lei; Wan, Duanying

doi:10.1155/2019/2308218

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…Research on the dynamic response of rocks around tunnels has been carried out by numerous scholars [23][24][25], and numerous research results have been achieved using numerical simulation methods [26][27][28][29]. However, few studies have been conducted on the dynamic stress distribution and fracture area of rock tunnels under different orientations of blasting disturbance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Blasting Disturbance on the Dynamic Stress Distribution and Fracture Area of Rock Tunnels

Liu

Yang

et al. 2023

Applied Sciences

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In order to study the dynamic stress distribution and the fracture area of rock around the tunnel under different orientations of blasting disturbance, AUTODYN finite difference method software was used to conduct numerical simulation research. Gauge monitoring points were set around the numerical model of the tunnel to conduct real-time monitoring of the stress distribution, displacement and fracture area of the tunnel. Based on the analysis of the stress wave propagation law, the following conclusions are obtained: (1) under the condition of the same blasting loads, the stress and displacement of the tunnel is relatively small when the blasting disturbance source is located above the roof, i.e., the stress state of the tunnel is relatively stable and the fracture area around the tunnel is minimal; (2) from the uniaxial stress around the tunnel and the tunnel peripheral displacement, it can be seen that the displacement caused by horizontal direction stress of the tunnel is the largest, and the deformation is mainly concentrated above the floor and at the shoulder, while the vertical wall part has almost no deformation; (3) for brittle materials such as rock, the arch-shaped stress-bearing surface is more likely to disperse stress, while the straight wall and flat floor of the tunnel cannot well disperse stress, resulting in uneven stress on the stress-bearing surface, uncoordinated deformation and ultimately, failure.

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Section: Introductionmentioning

confidence: 99%

Influence of Blasting Disturbance on the Dynamic Stress Distribution and Fracture Area of Rock Tunnels

Liu

Yang

et al. 2023

Applied Sciences

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“…Scholars also have explored the damage and failure of underground anchored caverns with pre-existing fractures. Liu et al 10 investigated the propagation of fractures around tunnels under blast load through use of a tunnel model containing a spandrel crack (TMCSC) model. Zhou et al 11 explored the propagation characteristics of radial fractures in tunnels under the effect of impact load.…”

Section: Introductionmentioning

confidence: 99%

Distribution of cracks in an anchored cavern under blast load based on cohesive elements

Luo

Pei

et al. 2022

Sci Rep

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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 analyzed. The crack propagation modes and distributions in anchored caverns with different dip angles fractures in the vault were thoroughly discussed. With the propagation of the explosive stress waves, cracks successively occur at the arch foot, the floor of the anchored caverns, and the boundary of the anchored zone of the vault. Tensile cracks are preliminarily found in rocks that surround the caverns. In the scenario of a pre-fabricated fracture in the upper part of the vault, the number of cracks at the boundary of the anchored zone of the vault first decreases then increases with the increasing dip angle of the pre-fabricated fracture. When the dip angle of the pre-fabricated fracture is 45°, the fewest cracks occur at the boundary of the anchored zone. The wing cracks deflected to the vault are formed at the tip of the pre-fabricated fracture, around which are synchronous formed tensile and shear cracks. Under top explosion, the peak displacement and the peak particle velocity in surrounding rocks of anchored caverns both reach their maximum values at the vault, successively followed by the sidewall and the floor. In addition, with the different dip angles of the pre-fabricated fracture, asymmetry could be found between the peak displacement and the peak particle velocity. The vault displacement of anchored caverns is mainly attributed to tensile cracks at the boundary of the anchored zone, which are generated due to the tensile waves reflected from the free face of the vault. When a fracture occurs in the vault, the peak displacement of the vault gradually decreases while the residual displacement increases.

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“…Scholars also have explored the damage and failure of underground anchored caverns with pre-existing fractures. Liu et al [10] investigated the propagation of fractures around tunnels under blast load through use of a TMCSC model. Zhou et al [11] explored the propagation characteristics of radial fractures in tunnels under the effect of impact load.…”

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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Study on the Fracture Behavior of Cracks Emanating from Tunnel Spandrel under Blasting Loads by Using TMCSC Specimens

Cited by 4 publications

References 29 publications

Influence of Blasting Disturbance on the Dynamic Stress Distribution and Fracture Area of Rock Tunnels

Influence of Blasting Disturbance on the Dynamic Stress Distribution and Fracture Area of Rock Tunnels

Distribution of cracks in an anchored cavern under blast load based on cohesive elements

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

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