Numerical simulation of influence of filled joint on the crack formed by notch hole blast

Huang, Junhong; Li, Xinping; Luo, Yi; Liu, Tingting; Dong, Qian; Xu, Kun; Tang, Chuxuan

doi:10.1080/19648189.2017.1392366

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…Junlin Lv, Binbin Zheng, Zhen Liu, Junhong Huang the explosive on the rock mass after detonation is described, which can simulate the rock blasting process more accurately [14,15]. Therefore, the multimaterial fluid-solid coupling algorithm in the LS-DYNA dynamic finite element program was used for the simulation calculation.…”

Section: Numerical Calculation Methodsmentioning

confidence: 99%

Controlled shaped-charge blasting technology for deep underground tunnel engineering

2023

JCE

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With the rapid development of the economy and society, the demand for mineral resources and energy has increased rapidly. However, it is difficult to improve the efficiency of blasting construction and control the stability of the surrounding rock in deep underground engineering. In this study, the deep underground tunnel of the Tianchi pumped-storage hydropower station in China was considered as the engineering background. Based on the stress redistribution state of the surrounding rock after blasting excavation, the crack propagation effect and dynamic response of the surrounding rock under different controlled blasting methods were studied through theoretical analyses, numerical simulations and in situ tests. The mechanism of directional crack formation was analysed by considering the influence of hole spacing and in situ stress. It was shown that the initial ground stress was conducive to the propagation of the blasting crack in the contour hole of smooth blasting towards the direction line of the blast hole. The test results showed that using controlled shaped-charge blasting methods in the blasting excavation of underground tunnels can improve the utilisation rate of explosives, reduce blasting vibration and achieve a significant effect on directional crack formation. The research results have important engineering significance as they can lead to improvements in the blasting technique, a contour-forming effect of the blasting excavation and control of the stability of the surrounding rock.

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Section: Numerical Calculation Methodsmentioning

confidence: 99%

Controlled shaped-charge blasting technology for deep underground tunnel engineering

2023

JCE

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“…Previous numerical simulations show that the fracture patterns are almost the same under different mesh topologies [23,24,25]. When mesh topology is rectangular, the fracture patterns tend to be linear, which is more convenient for intuitive comparative analysis.…”

Section: Stress Concentration Effect On the Blast Hole Wall Of Tbh Unmentioning

confidence: 98%

Numerical Simulation Research of Smooth Wall Blasting Using the Timing Sequence Control Method under Different Primary Blast Hole Shapes

Huang

et al. 2019

Shock and Vibration

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To make sure the integrity and stability of surrounding rock structure during blasting excavation of important structural planes in deep underground caverns, two kinds of fine blasting methods, timing sequence control fracture blasting network and notch blast hole, are innovatively combined and the formation of cracks between smooth blasting holes with different delay initiation and different shapes of primary blast holes (PBHs) are compared and analyzed. The results show that when the delay initiation time between the successive explosion holes is greater than or equal to the transverse wave of the PBH propagates to the target blast hole (TBH), the concentrated stress along the connection direction of the hole on the wall of the TBH is larger than the other directions of the hole wall. After the TBH is detonated, cracks will preferentially expand along the connection direction of the blast holes. If the PBH is the notch blast hole, more explosive energy will be directed to the wall of the TBH so that the hole wall along the connection direction of the blast holes will be subjected to greater tension stress before the initiation of the TBH. In this way, the interval between successive holes can be increased and the efficiency of blasting excavation of rock mass can be improved accordingly.

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“…The propagation of these stress waves depends on the presence of rock discontinuities, such as cracks or joints, which are ubiquitous in natural rock masses and in situ stress conditions [2,3]. For example, the characteristics of discontinuities, such as joint angle, joint number, joint stiffness, or joint spacing, impose anisotropy in the direction of stress wave propagation and attenuation [4][5][6][7]. The attenuation characteristics are usually studied by comparing the frequency-spectrum evolution before and after the joint formation [8,9].…”

Section: Introductionmentioning

confidence: 99%

Damage Mechanism and Wave Attenuation Induced by Blasting in Jointed Rock

Song

Zhang

et al. 2022

Geofluids

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This work uses a combination of simulations performed via numerical models and field observations studied the attenuation of deep-hole blasting stress waves and the evolution mechanism of cracks in a jointed rock mass. First, we conclude that the larger the joint angle is, the larger is the transmission coefficient and smaller is the fractal dimension. Second, the time difference between the peak stress difference and the maximum principal stress on both sides of the blasting hole in the horizontal direction of the rock mass with joints is relatively large, but there is no significant difference in the vertical direction. Finally, an unjointed-rock-mass model and multiple parallel joint model are established to explore the attenuation of stress waves and damage effect of multiple joint rock mass, it is concluded that the larger the angle, the smaller is the particle peak velocity and amplitude attenuation, and as the number of stress waves passing through the joints increases, the amplitude gradually decreases and the high-frequency amplitude decreases more significantly than the low-frequency amplitude. The research conclusions of this paper further reveal the damage mechanism induced by a blasting stress wave on jointed rock masses and the law of stress wave propagation and attenuation.

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Numerical simulation of influence of filled joint on the crack formed by notch hole blast

Cited by 8 publications

References 21 publications

Controlled shaped-charge blasting technology for deep underground tunnel engineering

Controlled shaped-charge blasting technology for deep underground tunnel engineering

Numerical Simulation Research of Smooth Wall Blasting Using the Timing Sequence Control Method under Different Primary Blast Hole Shapes

Damage Mechanism and Wave Attenuation Induced by Blasting in Jointed Rock

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