Study on the response mechanism of tunnel blasting dynamics and the spatial variation characteristics of the surrounding rock

Hu, Qizhi; Zhang, Rui; Gao, Yaohui; Hong, Chang-wei

doi:10.1088/1755-1315/510/5/052067

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…13 Zhang simulated the construction process of tunnel blasting, the numerical results found that the exponential load waveform can more completely show the spatial variability characteristics of surrounding rock than the smooth curve load waveform and the triangular load waveform, and the deformation size is consistent with the actual working condition. 14 He et al studied the variation law of explosion load and transient unloading stress field of in-situ stress caused by multi-stage blasting on the excavation surface. The research results found that when the local stress continues to increase, the contribution of transient unloading of geostress to the damaged region will become more and more obvious.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the response characteristics of a roadway wall under the impact of gas explosion

Zhenzhen

2023

Energy Science & Engineering

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Mine gas explosion causes serious failure (damage) to the roadway, but the research on the response characteristics of the impact load of gas explosion to the roadway wall are still very limited. In view of the shortcomings of the existing research, the LS‐DYNA software is used to establish the physical and mathematical models of gas explosion in a roadway, and the validation results show that the model is effective and reliable. Based on the model, changes of pressure, velocity, displacement of roadway walls and equivalent stress under the impact of gas explosions are measured. The response characteristics of the end and wall of roadway under the thermal impact of gas explosion are analyzed. The results show that the pressure on the closed end wall, the center and edge of the roadway is relatively large, and the wall failure is also relatively more serious. With the propagation of gas explosion, the overpressure on the closed end wall gradually attenuates, and the maximum overpressure region also retracts to the center. At the closed end, the explosion pressure is first loaded on the inner wall and gradually transferred to the outer wall. During the transfer, the pressure decays step by step, and the velocity of the measuring point at the closed end decays continuously. With the propagation of gas explosion, the displacement of each measuring point in the Z direction increases continuously. In the axial direction, the displacement near the center of the roadway is large, and then the displacement decreases in the form of regular rings. The impact load produced by the gas explosion is first loaded onto the closed end wall, resulting in wall deformation and equivalent stress. The study results can provide some theoretical basis and data support for the roadway wall design, and reduction of the wall failure.

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Section: Introductionmentioning

confidence: 99%

Analysis of the response characteristics of a roadway wall under the impact of gas explosion

Zhenzhen

2023

Energy Science & Engineering

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Research on Deformation and Loose Zone Characteristics of Large Cross Section Tunnel in High Geo-Stress Soft Rock

Tan

Bian

et al. 2023

Applied Sciences

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In constructing high-geo-stress soft rock tunnels, the major deformation disaster of the surrounding rock has always been the main problem faced during construction. The research on the deformation and loose zone characteristics of large deformation tunnels has positive significance for the safe and rapid construction of tunnels. Therefore, based on the Yuntunpu large deformation tunnel, this article first analyzes the geological and deformation characteristics of the tunnel site area in response to the problem of high-geo-stress soft rock large deformation. Subsequently, on-site testing and analysis were conducted on the loose zone characteristics of four tunnel sections. Finally, based on the comprehensive analysis of tunnel deformation and loose zone characteristics, the causes of large deformation in the tunnel are analyzed. The results indicate that the large deformation characteristics of the Yuntunpu Tunnel are mainly manifested as a large initial deformation rate of the surrounding rock, a short self-stabilization time of the surrounding rock, a large cumulative deformation amount, and a long deformation duration. The Yuntunpu Tunnel is influenced by the grade and structure of the surrounding rock, with a loosening zone ranging from 12 to 14 m, and the wave velocity variation characteristics exhibited by different grades of surrounding rock vary greatly. Adopting collaborative active control of long and short anchor rods is recommended to limit the continued development of loose zones and the deformation of surrounding rocks. The large deformation of tunnels is mainly affected by high geo-stress, formation lithology, geological structure, engineering disturbance, and groundwater. Among them, high geo-stress and formation lithology are the decisive and important factors for the occurrence of major deformation disasters in the tunnel.

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Study on the response mechanism of tunnel blasting dynamics and the spatial variation characteristics of the surrounding rock

Cited by 2 publications

References 2 publications

Analysis of the response characteristics of a roadway wall under the impact of gas explosion

Analysis of the response characteristics of a roadway wall under the impact of gas explosion

Research on Deformation and Loose Zone Characteristics of Large Cross Section Tunnel in High Geo-Stress Soft Rock

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