Rockburst Prediction on the Superimposed Effect of Excavation Accumulation Energy and Blasting Vibration Energy in Deep Roadway

Li, Qingwen; Xiang, Ben

doi:10.1155/2021/6644590

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…Region III is the circular arc area of the base plate, with the radius of 𝑅 3 = 4.6m. The size of the tunnel section is 4.2 m in height and 4.5 m in width [22]. It can be seen from the in situ stress measurement that each measuring point has two principal stresses close to the horizontal direction and the other principal stress close to the vertical direction.…”

Section: Calculation Results Of Energy Distributionmentioning

confidence: 99%

“…The excavation section of the tunnel is a typical three-core arch structure, as shown in Figure 2. Area I in the figure represents the arc area of the top plate and side wall, with the arc radius R 1 = 2.25 m. Region II is the transition arc area between the side wall and the bottom plate, with the radius of R 2 = 0.94 m. Region III is the circular arc area of the base plate, with the radius of R 3 = 4.6 m. The size of the tunnel section is 4.2 m in height and 4.5 m in width [22].…”

Section: Calculation Results Of Energy Distributionmentioning

confidence: 99%

“…The measured in situ stress, rock mass elastic modulus, and Poisson's ratio are substituted into formulas ( 5) to (7), so the quasi-static energy density distribution of the surrounding rock around the tunnel at different positions can be fitted, as shown in Figure 3 [22].…”

Section: Calculation Results Of Energy Distributionmentioning

confidence: 99%

“…The established model is depicted in Figure 4. surrounding rock around the tunnel at different positions can be fitted, as shown in Figure 3 [22].…”

Section: Energy Characteristics Of Deep Mining With Numerical Simulationmentioning

confidence: 99%

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Analysis of Rock Mass Energy Characteristics and Induced Disasters Considering the Blasting Superposition Effect

Chen,

Yang,

Guo

et al. 2024

Processes

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Upon reaching deeper levels of extraction, dynamic hazards such as rockburst become more pronounced, with the high energy storage characteristics of rock masses in high-stress environments being the fundamental factor behind rockburst disasters. Additionally, deep-seated mineral extraction commonly involves drilling and blasting methods, where the vibrational energy generated by mining explosions combines with the elastic energy of rock masses, leading to a sudden growth in the risk and intensity of rockburst disasters. This paper, with deep mining at Sanshandao Gold Mine as the focal point, systematically investigates the impact of blasting vibrations on rockburst disasters in deep mines. Initially, based on extensive data on measured geostress considering the tri-arch cross-section form of deep tunnels, the elastic energy storage of the surrounding rocks in deep tunnels was calculated. The results indicate that the maximum energy storage of the surrounding rocks occurs at the bottom of the tunnel, with the peak accumulation position located at a distance of five times the tunnel radius. On this basis, the Map3D numerical simulation analysis was adopted to systematically capture the accumulation behavior and distribution characteristics of disturbance energy. Subsequently, by conducting the dynamic impact experiments with an improved Split Hopkinson pressure bar (SHPB) and monitoring vibration signals at various locations, the paper provides insights into the propagation patterns of impact energy in a long sample (400 mm in length and 50 mm in diameter). Analysis of the scattering behavior of vibrational energy reveals that the combined portion of blasting vibration energy constitutes 60% of the total vibrational energy. Finally, a rockburst disaster evaluation model based on energy accumulations was proposed to analyze the rockburst tendencies around deep tunnels. The results indicated that the disaster-driven energy increased by 19.9% and 12.2% at different places on the roadway. Also, the probability and intensity of a rockburst would be raised.

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Section: Calculation Results Of Energy Distributionmentioning

confidence: 99%

Section: Calculation Results Of Energy Distributionmentioning

confidence: 99%

Section: Calculation Results Of Energy Distributionmentioning

confidence: 99%

“…The established model is depicted in Figure 4. surrounding rock around the tunnel at different positions can be fitted, as shown in Figure 3 [22].…”

Section: Energy Characteristics Of Deep Mining With Numerical Simulationmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of Rock Mass Energy Characteristics and Induced Disasters Considering the Blasting Superposition Effect

Chen,

Yang,

Guo

et al. 2024

Processes

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Mechanism and Application of Blasting Technology Using Phase-Difference Vibration Mitigation on Adjacent Railway Tunnel

Zhang

Zhou

Zhang

et al. 2022

Shock and Vibration

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The blasting vibration velocity is a widely used controlling index for the safety assessment of tunnel structures. How to reduce the impact of blasting vibration on the operation of adjacent railway tunnels is worth studying. In this paper, the initial phase-difference of blasting using phase-difference shock absorption is derived from the propagation theory of the blasting stress wave. When the initial phase-difference is Δφi = ±(2n + 1)π (n = 1, 2, 3, …), the peak particle velocity (PPV) in the tunnel structure is decreased to the minimum. On the basis of blasting theory using phase-difference shock absorption, the blasting parameters were designed for the No. 2 drainage tunnel excavated which adjacent a railway tunnel from Guiyang to Changsha, and it carried out 4 times blasting tests. It was found that the PPV of the railway tunnel structure in X, Y, and Z directions reduced by 64.6%, 66.25%, and 81.26%, respectively, which compared with the conventional blasting with the same total quality. Meanwhile, the amount of overbreak and underbreak can be controlled within 5%. The results show that the effect of blasting technology using phase-difference vibration mitigation is obvious, which is able to match with the design requirements for the tunnel excavation contour. The blasting technology using phase-difference vibration mitigation can be achieved via controlling the blasting time interval accurately. Moreover, it is beneficial for enriching and developing the blasting vibration control technology.

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Research on Evolution Characteristics of Unloading Energy in Excavation Face of High-Stress Pillar

Liu

Sun

Feng

et al. 2022

Shock and Vibration

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In the mining process of the stage empty field subsequent filling mining method, aiming at the problem of unloading failure and instability of the excavation face of the high-stress ore pillar, the theory of unloading stress component is introduced and combined with the energy release theory to explore the unloading failure mechanism of the excavation face of the ore pillar. The results show the following. (1) The degree of accumulation of strain energy in the pillar is related to the tangential stress. After the peak of the tangential stress, the energy changes from accumulation to release, indicating that energy release is the main cause of pillar damage. (2) In pillar unloading, there are 4 typical characteristic areas of stress during the loading process: crushing area, shaping area, elastic area, and original rock stress area. The energy accumulation area and the stress component area show good correspondence, and they all appear from the top to the bottom of the pillar. At 1/4, the starting point of unloading failure can be determined. (3) The mutation mechanism in the process of energy release is related to the time effect of tangential stress. On the contrary, the greater the tangential stress is, the longer the elastic zone lasts, and the more significant the energy accumulation is. Also, the increase in tangential stress will lead the energy release time becomes shorter, and a large amount of accumulated energy is released in a short time, causing local instability and destruction of the pillar, and eventually spreads to the whole.

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Rockburst Prediction on the Superimposed Effect of Excavation Accumulation Energy and Blasting Vibration Energy in Deep Roadway

Cited by 4 publications

References 28 publications

Analysis of Rock Mass Energy Characteristics and Induced Disasters Considering the Blasting Superposition Effect

Analysis of Rock Mass Energy Characteristics and Induced Disasters Considering the Blasting Superposition Effect

Mechanism and Application of Blasting Technology Using Phase-Difference Vibration Mitigation on Adjacent Railway Tunnel

Research on Evolution Characteristics of Unloading Energy in Excavation Face of High-Stress Pillar

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