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Blasting vibration response and safety control of mountain tunnel

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Abstract

Tunnel blasting vibration will have adverse effects on adjacent existing villages. To ensure the normal life and safety of residents in these existing villages, it is particularly important to monitor and analyze the vibration induced by tunnel blasting. In this paper, with the blasting project of Chong-Li Tunnel under the existing village as an example, the characteristics of the tunnel blasting vibration response are analyzed. First, the blasting vibration velocity and frequency on the ground are obtained by field monitoring, and the propagation law of blasting vibration is studied. Second, a three-dimensional finite difference element model is established by numerical simulation and verified by the measured data. According to the numerical simulation results, the transverse influence range and longitudinal influence range of tunnel blasting vibration are divided, and the location of the measuring point with the largest blasting vibration response is determined. Then, taking the PPV with the largest vibration response as the control index, the corresponding control blasting distances in front of and behind the tunnel section are determined. Finally, 8 blasting tests with different charges per delay are carried out to obtain the control threshold of the maximum charge per delay.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable requirements.

Abbreviations

PPV:

Peak particle velocity

R :

Distance from the blast area

D :

Mileage distance between the measuring point and the excavation section

K :

Parameter of blasting vibration

α :

Parameter of blasting vibration

Q :

Maximum charge per delay

E s :

Elastic modulus of rock mass

E d :

Dynamic elastic modulus of the rock mass

r 1 :

Radius of the blasting crushing zone

r 2 :

Radius of the broken zone

r d :

Equivalent radius of action

P 0 :

Initial pressure in the blasthole

P d :

Equivalent blasting load

σ*:

Dynamic compressive strength of the rock mass

p e :

Equivalent blasting load

ρ :

Density of the rock mass

ρ e :

Density of explosives

c p :

Longitudinal wave propagation velocity of the rock mass

σ c :

Uniaxial compressive strength of rock mass

σ cd :

Dynamic uniaxial compressive strength of a rock mass

σ t :

Uniaxial tensile strength of rock mass

d a :

Diameter of the explosive

d b :

Blasthole diameter

V D :

Detonation wave velocity

μ s :

Poisson’s ratio

μ d :

Dynamic Poisson’s ratio

φ :

Friction angle

c :

Cohesion

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Funding

The work described in this paper is supported by the National Natural Science Foundation of China (numbers 51878242 and 41572270), the Natural Science Foundation of Hebei Province (number E2020404007), and the Hebei Provincial Innovation Capacity Improvement Plan Project (21567614H). The original data for this research are mainly from the Horizontal Project of the Enterprise Alliance (XJTXTL-JSZX-2020-0010).

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Correspondence to Yan Zhao.

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The authors declare no competing interests.

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Shan, R., Zhao, Y., Wang, H. et al. Blasting vibration response and safety control of mountain tunnel. Bull Eng Geol Environ 82, 166 (2023). https://doi.org/10.1007/s10064-023-03199-z

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  • DOI: https://doi.org/10.1007/s10064-023-03199-z

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