Influence of blasting load directions on tunnel stability in fractured rock mass

Li, Xiaohan; Zhu, Zheming; Wang, Meng; Shu, Yun; Deng, Shuwen; Xiao, Dingquan

doi:10.1016/j.jrmge.2021.06.010

Cited by 26 publications

(12 citation statements)

References 56 publications

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“…Finally, it was found that the increase in in situ stress decreases the blasting decoupling coefficient (Li et al, 2022).…”

Section: Numerical Modellingmentioning

confidence: 98%

Fracture Mechanics Induced by Drilling and Blasting in Underground Openings: Prevailing Practices and Studies

Katuwal,

Adhikari

2023

Tech J

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This article presents the prevailing practices and literature review on the study of fracture mechanics of rock mass, during the construction of underground openings, by drill and blast method (DBM). The paper makes an introductory discussion on basic fracture and failure mechanics on the rock, followed by a review due to the blast-induced failure mechanism. The damage zone in drill and blast openings is discussed which is followed by the conclusions of the literature. DBM is a widely acceptable and broadly applicable approach in the underground construction method. The blasting damaged zones are classified as the borehole expansion zone, crushed zone, nonlinear fracture zone, and radial crack propagation zone. Blasting activities create stress waves in construction work, which fundamentally influence the fracture and failure mechanics of rock with pre-existing discontinuities, in-situ stress, and groundwater conditions. On the other hand, the cumulative action of subsequent explosion gas and stress waves defines the final damage limit and crack pattern map. Thus, it is of utmost importance to investigate the blast-induced fracture and failure mechanism to mitigate the instability in the underground openings.

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“…Finally, it was found that the increase in in situ stress decreases the blasting decoupling coefficient (Li et al, 2022).…”

Section: Numerical Modellingmentioning

confidence: 98%

Fracture Mechanics Induced by Drilling and Blasting in Underground Openings: Prevailing Practices and Studies

Katuwal,

Adhikari

2023

Tech J

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“…To effectively blast in tunneling, adding free faces is the most vital factor for initiating or maximizing the Hopkinson effect. It is well known that the dynamic tensile strength of rock is much lower than the dynamic compressive strength [23,24]. If the tension stress waves exceed the dynamic tensile strength of the rock, cracks will be generated gradually, and this tensile stress leads to greater damage to the rock mass in the vicinity of the free face [16].…”

Section: A Mechanism Of Tensile Fracturing By Long and Large-diameter...mentioning

confidence: 99%

Assessment of the Blasting Efficiency of a Long and Large-Diameter Uncharged Hole Boring Method in Tunnel Blasting Using 3D Numerical Analysis

Kim

Song

et al. 2022

Sustainability

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Cut blasting is one of the most essential processes to reduce blast-induced vibration in tunnel blasting. The long and large-diameter uncharged hole boring (LLB) method is an example of one of the cut blasting methods, which utilizes large-diameter uncharged holes drilled in the tunnel face. In this study, blasting simulations were performed to analyze its blasting mechanism, and the LLB method and the traditional burn-cut method were simulated to compare their blasting efficiency. A 3D numerical analysis using LS-DYNA code, a highly non-linear transient dynamic finite element analysis using explicit time integration, was used to simulate the blasting process, and a Johnson–Holmquist constitutive material model, which is optimal for simulating brittle materials under dynamic conditions, was used to simulate the rock behavior under blasting. The modified LLB method showed a 3.75-fold increase in the advance per round compared to the burn-cut method, due to the increased formation of long and large-diameter uncharged holes compared to blast holes. This modified LLB method used 30% less explosives, so its failure range was approximately 1.25 times less than that of the burn-cut method, but its advance was approximately 4 times larger than the burn-cut method, which was similar to the original LLB method. This confirmed that the modified LLB method is significantly more efficient in terms of increased blasting efficiency (particularly the advance per round) as well as reduced blast-induced vibration, compared to the traditional cut blasting method.

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“…The construction of the tunnel has Buildings 2024, 14, 1356 2 of 15 the potential to facilitate regional economic development, enhance intercity connectivity and collaboration, and enhance the overall economic competitiveness of the region. In summary, the establishment of the tunnel holds considerable importance in facilitating economic progress, enhancing the quality of life for individuals, and optimizing transportation efficacy [8][9][10][11][12]. Figure 1 displays a typical engineering project for an underwater tunnel traversing several zones of fault fractures with high hydraulic pressure.…”

Section: Introductionmentioning

confidence: 99%

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

Huang,

Han

2024

Buildings

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The construction of multiple tunnels across inland rivers has had a significant influence on the improvement of the transportation infrastructure. The technology for constructing tunnels is progressing towards the development of larger cross-sections, longer distances, and the ability to withstand high hydraulic pressure in complex hydrogeological conditions, including high-permeability strata. In order to ensure the face stability of shield tunnels under high hydraulic pressure that crosses a fault fracture zone, it is necessary to study the progressive failure mechanism of shield tunnel faces induced by high hydraulic pressure seepage. This paper employs finite element numerical simulation software to methodically examine the variation in the characteristics of the water seepage field, limiting support force, and face stability failure mode of shield tunnels passing through fault fracture zones with high hydraulic pressure under varying fault fracture width zones. The results show that the formation hydraulic gradient will progressively widen when the tunnel face is located within the undisturbed rock mass and is advanced towards the area of fault fracture. This will raise the likelihood of instability in the shield tunnel and progressively raise the limiting support force on the tunnel face. Moreover, as the tunnel face nears the region of fault fracture within the undisturbed rock mass, the damage range increases gradually. In addition, due to the increase in seepage force, the angle between the failure area and the horizontal plane becomes more and more gentle. On the contrary, as the tunnel’s face moves closer to the undisturbed rock mass from the region of the fault fracture, the damage range gradually decreases, and the dip angle between the damage area and the horizontal plane becomes steeper and steeper due to the decreasing seepage force in the process. The study findings presented in this work are highly significant, both theoretically and practically, for the design and management of safety.

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Influence of blasting load directions on tunnel stability in fractured rock mass

Cited by 26 publications

References 56 publications

Fracture Mechanics Induced by Drilling and Blasting in Underground Openings: Prevailing Practices and Studies

Fracture Mechanics Induced by Drilling and Blasting in Underground Openings: Prevailing Practices and Studies

Assessment of the Blasting Efficiency of a Long and Large-Diameter Uncharged Hole Boring Method in Tunnel Blasting Using 3D Numerical Analysis

Progressive Failure Mechanism of Shield Tunnel Face in Complex Urban Geological Environment

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