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A platform for research: civil engineering, architecture and urbanism
Blasting effects of cross‐fault deep‐buried excavation on adjacent existing tunnel stability
https://orcid.org/0000-0002-7773-2678
https://orcid.org/0000-0001-6718-6688
AbstractThe vibration caused by blasting excavation of rock mass frequently poses a threat to the stability of adjacent tunnels. Previous research is limited by the simplification of a rock mass as a homogeneous elastic medium, without considering the wave attenuation caused by viscoelasticity and wave separation induced by rock discontinuities, as well as plane waves while neglecting geometric attenuation of near‐field nonplane blast waves. This paper establishes a theoretical model of cylindrical P‐wave propagation across a fault to an adjacent existing tunnel. Based on the time‐domain recursive method, vibration equations and peak particle velocity on the adjacent existing tunnel wall caused by a cylindrical wave passing through a fault are derived. The rock mass and fault are assumed to satisfy Kelvin viscoelastic bodies, and contact interfaces between fault and rock mass follow a nonlinear hyperbolic deformation model in the normal direction and a linear model in the tangential direction. The results show that tunnel vibration caused by the blast cylindrical P‐wave is primarily induced by transmitted P‐waves. With the increase of the fault dip angle, vibration on the upper side of the adjacent existing tunnel gradually decreases, while vibration on the lower side increases. The closer the vibration to the upper and lower sides, the stronger the shear effect on the tunnel wall, and the closer the vibration to the middle, the stronger the pressure effect on the tunnel wall. Larger fault thickness and higher initial blast wave frequency result in weaker vibration of the adjacent tunnel. The deeper the burial depth, the stronger the vibration of the adjacent tunnel wall. Findings of this study provide insight into the dynamic response of rock construction and safety evaluation in engineering service.
Highlights Theoretical analysis is conducted for the induced peak particle velocity of the adjacent existing tunnel caused by cylindrical wave propagation through a fault in a deep rock mass. Quality factors of a stress wave are introduced to analyze the effect of wave propagation caused by the viscoelasticity of the rock mass. A wave propagation equation is derived when the stress wave propagates in the fault with a viscoelastic filling layer. The effect of parameters of the fault characteristics in a rock mass on the vibration of the existing tunnel induced by wave propagation is studied.
Blasting effects of cross‐fault deep‐buried excavation on adjacent existing tunnel stability
https://orcid.org/0000-0002-7773-2678
https://orcid.org/0000-0001-6718-6688
AbstractThe vibration caused by blasting excavation of rock mass frequently poses a threat to the stability of adjacent tunnels. Previous research is limited by the simplification of a rock mass as a homogeneous elastic medium, without considering the wave attenuation caused by viscoelasticity and wave separation induced by rock discontinuities, as well as plane waves while neglecting geometric attenuation of near‐field nonplane blast waves. This paper establishes a theoretical model of cylindrical P‐wave propagation across a fault to an adjacent existing tunnel. Based on the time‐domain recursive method, vibration equations and peak particle velocity on the adjacent existing tunnel wall caused by a cylindrical wave passing through a fault are derived. The rock mass and fault are assumed to satisfy Kelvin viscoelastic bodies, and contact interfaces between fault and rock mass follow a nonlinear hyperbolic deformation model in the normal direction and a linear model in the tangential direction. The results show that tunnel vibration caused by the blast cylindrical P‐wave is primarily induced by transmitted P‐waves. With the increase of the fault dip angle, vibration on the upper side of the adjacent existing tunnel gradually decreases, while vibration on the lower side increases. The closer the vibration to the upper and lower sides, the stronger the shear effect on the tunnel wall, and the closer the vibration to the middle, the stronger the pressure effect on the tunnel wall. Larger fault thickness and higher initial blast wave frequency result in weaker vibration of the adjacent tunnel. The deeper the burial depth, the stronger the vibration of the adjacent tunnel wall. Findings of this study provide insight into the dynamic response of rock construction and safety evaluation in engineering service.
Highlights Theoretical analysis is conducted for the induced peak particle velocity of the adjacent existing tunnel caused by cylindrical wave propagation through a fault in a deep rock mass. Quality factors of a stress wave are introduced to analyze the effect of wave propagation caused by the viscoelasticity of the rock mass. A wave propagation equation is derived when the stress wave propagates in the fault with a viscoelastic filling layer. The effect of parameters of the fault characteristics in a rock mass on the vibration of the existing tunnel induced by wave propagation is studied.
Blasting effects of cross‐fault deep‐buried excavation on adjacent existing tunnel stability
https://orcid.org/0000-0002-7773-2678
https://orcid.org/0000-0001-6718-6688
AbstractThe vibration caused by blasting excavation of rock mass frequently poses a threat to the stability of adjacent tunnels. Previous research is limited by the simplification of a rock mass as a homogeneous elastic medium, without considering the wave attenuation caused by viscoelasticity and wave separation induced by rock discontinuities, as well as plane waves while neglecting geometric attenuation of near‐field nonplane blast waves. This paper establishes a theoretical model of cylindrical P‐wave propagation across a fault to an adjacent existing tunnel. Based on the time‐domain recursive method, vibration equations and peak particle velocity on the adjacent existing tunnel wall caused by a cylindrical wave passing through a fault are derived. The rock mass and fault are assumed to satisfy Kelvin viscoelastic bodies, and contact interfaces between fault and rock mass follow a nonlinear hyperbolic deformation model in the normal direction and a linear model in the tangential direction. The results show that tunnel vibration caused by the blast cylindrical P‐wave is primarily induced by transmitted P‐waves. With the increase of the fault dip angle, vibration on the upper side of the adjacent existing tunnel gradually decreases, while vibration on the lower side increases. The closer the vibration to the upper and lower sides, the stronger the shear effect on the tunnel wall, and the closer the vibration to the middle, the stronger the pressure effect on the tunnel wall. Larger fault thickness and higher initial blast wave frequency result in weaker vibration of the adjacent tunnel. The deeper the burial depth, the stronger the vibration of the adjacent tunnel wall. Findings of this study provide insight into the dynamic response of rock construction and safety evaluation in engineering service.
Highlights Theoretical analysis is conducted for the induced peak particle velocity of the adjacent existing tunnel caused by cylindrical wave propagation through a fault in a deep rock mass. Quality factors of a stress wave are introduced to analyze the effect of wave propagation caused by the viscoelasticity of the rock mass. A wave propagation equation is derived when the stress wave propagates in the fault with a viscoelastic filling layer. The effect of parameters of the fault characteristics in a rock mass on the vibration of the existing tunnel induced by wave propagation is studied.
Blasting effects of cross‐fault deep‐buried excavation on adjacent existing tunnel stability
Deep Underground Science and Engineering
Chai, Shaobo (author) / Chai, Lianzeng (author) / Meng, Chao (author) / Liu, Kai (author) / Song, Lang (author) / Zheng, Shaojie (author)
2024-12-08
Article (Journal)
Electronic Resource
English
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