Effects of Axial Air Deck on Blast-Induced Ground Vibration

Cheng, Ruishan; Zhou, Zilong; Chen, Wensu; Hao, Hong

doi:10.1007/s00603-021-02676-9

Cited by 27 publications

(9 citation statements)

References 49 publications

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“…The vibration velocity decays rapidly within a certain distance, and then the decay rate begins to decrease with the continuous increase of the distance. This phenomenon has also been widely reported by other researchers (Cheng et al, 2022; Zhang et al, 2021).…”

Section: Field Monitoring and Data Analysissupporting

confidence: 87%

Dynamic response and safety control of civil air defense tunnel group during the whole process of underpass tunnel blasting excavation

Yang

Jiang

Zhou

et al. 2022

International Journal of Protective Structures

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To ensure the safety and stability of adjacent underground structures is a key problem for the subway tunnel blasting construction. In this paper, there is a tunnel group (Sheshan civil air defense engineering) composed of several tunnel units right above a subway tunnel under blasting construction (Wuhan Metro Line 5). The vibration of the tunnel group induced by two blasting excavations of the subway tunnel was monitored. For further research, an effective 3D numerical model established by LS-DYNA, which was verified by field monitoring data, was used to analyze the dynamic response of the tunnel group in the whole process of the subway tunnel blasting. According to the numerical simulation results, the dynamic response characteristics of each tunnel unit were studied, and the most vulnerable area in each tunnel unit was determined. Then, the functional relationships between the maximum vibration velocities and the maximum tensile stresses of the vulnerable areas were established. Based on the maximum tensile stress criterion, the safety vibration velocity threshold of each vulnerable area was calculated using the relationship models. Furthermore, for convenient field monitoring during the subway construction, the safety vibration threshold at the floor of the tunnel group was also calculated. Lastly, to obtain the maximum charge per delay, five cut blasting with different charges were simulated. The maximum charge of the cut blasting in different stages of the subway tunnel blasting excavation was proposed. The research results of this paper have reference value for the blasting vibration safety control of similar tunnel excavation projects in the future.

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Section: Field Monitoring and Data Analysissupporting

confidence: 87%

Dynamic response and safety control of civil air defense tunnel group during the whole process of underpass tunnel blasting excavation

Yang

Jiang

Zhou

et al. 2022

International Journal of Protective Structures

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“…So, ALE algorithm is used for air, explosives, stemming and slightly weathered sandy mudstone units, and Lagrange algorithm is used for miscellaneous fill, clay, and lining. According to some research studies(Kuhlemeyer and Lysmer, 1973; Cheng et al, 2021), blasting stress wavelength needs to occupy 8–10 elements to avoid data distortion. The mesh around the cutting hole is divided by fine mesh, and the mesh size is 20 mm.…”

Section: Numerical Model and Verificationmentioning

confidence: 99%

“…By substituting the dynamic tensile strength of concrete 3.06 MPa into formula (11), the PPV of subway tunnel lining is 13.06 cm/s. Some studies have studied different tunnels and proposed different standards (Jiang and Zhou, 2012; Liang et al, 2013; Liu et al, 2020; Mussa et al, 2018), which show that the safety standard according to PPV is related to the general situation of field engineering (Cheng et al, 2021).…”

Section: Subway Tunnel Lining Safety Distance Judgmentmentioning

confidence: 99%

Dynamic response characteristics of adjacent tunnel lining under blasting impact in subway connecting passage

Xiong

Jiang

Zhou

et al. 2022

International Journal of Protective Structures

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The connecting passage between two adjacent tunnels is conducive to the rescue and evacuation of subway tunnels when disasters occur. The blasting method is usually used in the construction of connecting passage. The vibration caused by blasting construction may endanger the safety of subway tunnel structure. As a result, the influence of blasting pressure on the stability of subway tunnel lining structure during the excavation of connecting passage is studied, and the safe blasting construction distance is proposed, which is crucial to the safety of adjacent subway tunnel lining. This study takes the connecting passage of Wuhan Metro Line 8 as an example. Using Finite element software ANSYS/LS-DYNA, an accurate numerical calculation model of construction site is established. The nonlinear elastoplastic mechanical characteristics of soil, rock, and tunnel lining are simulated by Drucker Prager, Plastic Kinematic, and Johnson Holmquist Concrete constitutive material models, respectively. The credibility of the three-dimensional numerical calculation model and material constitutive model was proved by contrasting the field measured data of the connecting passage with the numerical calculated results. Analysis of numerical results, the axial and radial PPV, frequency, and Von Mises stress of subway tunnel lining are obtained. The influence of subway tunnel lining under adjacent blasting can be obtained by analyzing the distribution law of PPV and Von Mises stress. Non-static tensile strength is needed considering the high pressure and high strain rate process of concrete during blasting. By fitting the relationship between PPV and dynamic tensile stress, and referring to DIF parameters, the safety range of PPV in subway tunnel lining blasting is determined. The critical safety distance between blasting construction and tunnel lining is obtained by Sadovsky vibration velocity attenuation formula, which is used to guide the subsequent blasting excavation of continuous tunnels.

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“…Rock breakage is imperative to a variety of rock engineering projects, such as mining and tunnelling [ 1 , 2 , 3 ]. With the accelerating progress of rock engineering, the drawbacks of the drilling-and-blasting method, such as great rock damage, violent ground vibration, significant operating risk, low energy utilization, and intermittent operation, have been increasingly exposed [ 4 , 5 ]. These disadvantages seriously restrict the safe and efficient construction of rock engineering projects.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of Sandstone Exposed to Cyclic Point-Loading: Implications for Improving Mechanized Rock Breakage Efficiency

et al. 2023

Self Cite

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During the process of mechanized excavation, rock is essentially subjected to cyclic point loading (CPL). To understand the CPL fatigue behavior of rock materials, a series of CPL tests are conducted on sandstone samples by using a self-developed vibration point-load apparatus. The effects of loading frequency and waveform on rock fatigue properties under CPL conditions are specifically investigated. The load and indentation depth histories of sandstone samples during testing are monitored and logged. The variation trends of fatigue life (failure time) under different loading conditions are obtained. Test results indicate that the fatigue life of the sandstone sample exposed to CPL is dependent on both loading frequency and waveform. As the loading frequency rises, the fatigue life of the sandstone first declines and then increases, and it becomes the lowest at 0.5 Hz. In terms of waveform, the fatigue life of the sandstone is largest under the trigonal wave and is least under the rectangular wave. These findings can provide valuable theoretical support for optimizing the rock cutting parameters to enhance the efficiency of mechanized excavation.

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Effects of Axial Air Deck on Blast-Induced Ground Vibration

Cited by 27 publications

References 49 publications

Dynamic response and safety control of civil air defense tunnel group during the whole process of underpass tunnel blasting excavation

Dynamic response and safety control of civil air defense tunnel group during the whole process of underpass tunnel blasting excavation

Dynamic response characteristics of adjacent tunnel lining under blasting impact in subway connecting passage

Fatigue Behavior of Sandstone Exposed to Cyclic Point-Loading: Implications for Improving Mechanized Rock Breakage Efficiency

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