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Experimental and Numerical Study on Mechanical Response Mechanism of Granite Under Coupled Confining Pressure and Blasting Load
https://orcid.org/http://orcid.org/0000-0002-4905-3192
https://orcid.org/https://orcid.org/0000-0002-8047-3398
The presence of in situ stress has a non-negligible effect on the blasting excavation of deep rock mass. However, the effect of confining pressure on the mechanical response mechanism under blast loading is still unclear. To investigate the mechanical behaviour of granite under the effect of confining pressure, explosion experiments and numerical simulations were carried out. The blasting process, the damage and failure characteristics of granite, and the mechanical response mechanism are analyzed comprehensively. The results show that (1) The equal biaxial pressure has a certain inhibition effect on the formation of granite crushed zone, and has a significant inhibition effect on the crack propagation in the fractured zone. The range and duration of the fragment throwing are negatively affected by the confining pressure. (2) When the unequal biaxial pressure is applied, the principal confining pressure has a significant inhibition effect on the formation of crushed zone and damage zone in the direction of non-principal; the depth and volume of the crushed zone are under the synergistic control of the pressure in two directions. (3) The existence of triaxial pressure on the granite damage and failure characteristics have significant control, and this effect has a directional correlation, the degree of inhibition with the increase in pressure and slow down. (4) The stress field distribution of the rock mass was visualised, and the mechanism of the influence of the confining pressure on the cracking and damaging effect of the blasting stress wave was explained. In addition, combined with the practice of blasting project of tunneling, the way to improve the effect of rock breaking through the optimisation of blasthole arrangement was discussed.
The effect of confining pressure on the failure of granite was investigated.
The mechanical mechanism of granite under blasting was explained.
The way to improve the effect of rock breaking was discussed.
Experimental and Numerical Study on Mechanical Response Mechanism of Granite Under Coupled Confining Pressure and Blasting Load
https://orcid.org/http://orcid.org/0000-0002-4905-3192
https://orcid.org/https://orcid.org/0000-0002-8047-3398
The presence of in situ stress has a non-negligible effect on the blasting excavation of deep rock mass. However, the effect of confining pressure on the mechanical response mechanism under blast loading is still unclear. To investigate the mechanical behaviour of granite under the effect of confining pressure, explosion experiments and numerical simulations were carried out. The blasting process, the damage and failure characteristics of granite, and the mechanical response mechanism are analyzed comprehensively. The results show that (1) The equal biaxial pressure has a certain inhibition effect on the formation of granite crushed zone, and has a significant inhibition effect on the crack propagation in the fractured zone. The range and duration of the fragment throwing are negatively affected by the confining pressure. (2) When the unequal biaxial pressure is applied, the principal confining pressure has a significant inhibition effect on the formation of crushed zone and damage zone in the direction of non-principal; the depth and volume of the crushed zone are under the synergistic control of the pressure in two directions. (3) The existence of triaxial pressure on the granite damage and failure characteristics have significant control, and this effect has a directional correlation, the degree of inhibition with the increase in pressure and slow down. (4) The stress field distribution of the rock mass was visualised, and the mechanism of the influence of the confining pressure on the cracking and damaging effect of the blasting stress wave was explained. In addition, combined with the practice of blasting project of tunneling, the way to improve the effect of rock breaking through the optimisation of blasthole arrangement was discussed.
The effect of confining pressure on the failure of granite was investigated.
The mechanical mechanism of granite under blasting was explained.
The way to improve the effect of rock breaking was discussed.
Experimental and Numerical Study on Mechanical Response Mechanism of Granite Under Coupled Confining Pressure and Blasting Load
https://orcid.org/http://orcid.org/0000-0002-4905-3192
https://orcid.org/https://orcid.org/0000-0002-8047-3398
The presence of in situ stress has a non-negligible effect on the blasting excavation of deep rock mass. However, the effect of confining pressure on the mechanical response mechanism under blast loading is still unclear. To investigate the mechanical behaviour of granite under the effect of confining pressure, explosion experiments and numerical simulations were carried out. The blasting process, the damage and failure characteristics of granite, and the mechanical response mechanism are analyzed comprehensively. The results show that (1) The equal biaxial pressure has a certain inhibition effect on the formation of granite crushed zone, and has a significant inhibition effect on the crack propagation in the fractured zone. The range and duration of the fragment throwing are negatively affected by the confining pressure. (2) When the unequal biaxial pressure is applied, the principal confining pressure has a significant inhibition effect on the formation of crushed zone and damage zone in the direction of non-principal; the depth and volume of the crushed zone are under the synergistic control of the pressure in two directions. (3) The existence of triaxial pressure on the granite damage and failure characteristics have significant control, and this effect has a directional correlation, the degree of inhibition with the increase in pressure and slow down. (4) The stress field distribution of the rock mass was visualised, and the mechanism of the influence of the confining pressure on the cracking and damaging effect of the blasting stress wave was explained. In addition, combined with the practice of blasting project of tunneling, the way to improve the effect of rock breaking through the optimisation of blasthole arrangement was discussed.
The effect of confining pressure on the failure of granite was investigated.
The mechanical mechanism of granite under blasting was explained.
The way to improve the effect of rock breaking was discussed.
Experimental and Numerical Study on Mechanical Response Mechanism of Granite Under Coupled Confining Pressure and Blasting Load
Rock Mech Rock Eng
Zhang, Fei (author) / Yang, Liyun (author) / Hu, Yuxuan (author) / Ma, Jiangtao (author) / Liu, Ning (author) / Yang, Renshu (author)
Rock Mechanics and Rock Engineering ; 58 ; 1617-1637
2025-02-01
21 pages
Article (Journal)
Electronic Resource
English
Frictional characteristics of granite under high confining pressure
| Engineering Index Backfile | 1967
| DOAJ | 2020