Study on Optimization of Delay Method of Wedge Cut Blasting in Tunnel

Gao, Wenle; Liu, Zhicheng; Wang, Yanping; Yan, Zhimin; Zhang, Zehua

doi:10.1155/2021/1676269

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…For the other two materials, because the rock blasting process always involves a rapid increase in strain, the rock mass was modeled by the *MAT_PLASTIC_KINEMATIC constitutive model considering the strain rate effect 50 . Then, the *MAT_DRUCKER_PRAGER constitutive model was employed to depict the great deformation of the stemming plug under strong dynamic loads 51 . In addition to the material parameters of rocks from laboratory tests, the parameters of other materials were taken from previous studies and are provided in Tables 1 , 2 , 3 , 4 .…”

Section: Finite Element Simulationmentioning

confidence: 99%

“…Through similar material model experiments, Yang et al 20 researched the effect of the cutting hole angle on the rock block size and cavity morphology parameters of wedge cutting blasting and further provided a rational range of cutting hole angles. Gao et al 21 numerically studied the influence law of the initiation mode of the cutting holes on the damage distribution within the cutting cavity. They concluded that the staggered arrangement of the initiation points in the left and right cutting holes was the most reasonable mode.…”

Section: Introductionmentioning

confidence: 99%

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Research on the mechanism and application of wedge cutting blasting with hole-inner delay

Cheng,

Wang,

Wang

et al. 2024

Sci Rep

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To increase the efficiency of deep-hole blasting driving in mine rock tunnels, an innovative pattern of wedge cutting blasting with hole-inner delay was proposed. First, the blasting mechanisms of conventional and innovative wedge cutting patterns were theoretically investigated. The results showed that the resistance from large upper rock blocks and the clamping action from the surrounding rock were the major challenges of conventional cutting methods. For the innovative cutting pattern, under the conversion of the spatial distribution and release sequence of blasting energy, the first blasting of the upper charge can strengthen the breaking of the upper rock mass and create a new free surface, which provides favorable conditions for the delayed blasting of the bottom charge. Second, finite element models of two cutting patterns were established and solved, and the simulation results visually revealed the propagation of a stress wave. Critically, the stress strength in the upper cavity increased by 66–83% under the action of the upper charge, which was conducive to the breaking of the upper rock mass and the generation of a new free surface. Therefore, the rock mass in the bottom cavity can be readily broken and discharged. Ultimately, field applications were executed in a rock tunnel. Compared with a conventional cutting pattern, the proposed innovative cutting pattern can prominently increase the cycle advance and hole utilization and greatly reduce the unit consumption of explosives and detonators. This research confirms the usability of the innovative wedge cutting pattern with hole-inner delay in deep-hole blasting driving of rock tunnels.

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Section: Finite Element Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the mechanism and application of wedge cutting blasting with hole-inner delay

Cheng,

Wang,

Wang

et al. 2024

Sci Rep

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“…In order to control the tunnel blast, measures such as shortening the individual cycle of excavation, opening up the exterior in stages, adjusting the hole sizes incrementally, and reducing the maximum section charge of dynamite used are often adopted [9][10][11]. In recent years, research into controlled blasting has made fruitful progress [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Vibration Reduction and Explosion Control Investigation for an Ultra-Shallow Buried Tunnel under Crossing Buildings Based on HHT Analysis

Xu,

Zhang,

et al. 2023

Sensors

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With the rapid development of underground space utilization, the excavation of new tunnels with ultra-shallow under crossing buildings using the drilling and blasting method is gradually increasing. The blasting vibration will undoubtedly affect the surrounding buildings. Reducing the impact of blasting vibration on ground buildings has become an important technical challenge faced by tunnel blasting technicians. The inlet end of the Xi’an-Chengdu High-Speed Railway Xiannvyan Tunnel passes below a village through an ultra-shallow buried section; as a result, blasting vibration control is a major concern. A design scheme for a 0.6 m footage in tunnel was proposed and verified through field tests. A 0.8 m footage scheme and 1.8 m footage millisecond interference vibration reduction scheme were proposed, respectively. Based on the HHT analysis, by comparing the surface vibration velocities and instantaneous energy obtained from the millisecond delay detonation of cutting holes and the detonation of different charging schemes, we found that the free surface, mass of single dynamite charges, and tunnel burial depth had significant influences on the surface vibration.

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Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge Diameters

et al. 2022

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Considering the low efficiency of cutting blasting in hard rock mine tunnels, a novel solution of increasing the charge diameter of the cutting holes was put forward. To investigate the influence of the charge diameter on the cutting blasting results, three different working conditions of Φ 32 mm, Φ 42 mm, and Φ 50 mm blasting holes combined with Φ 27 mm, Φ 35 mm, and Φ 45 mm cartridges, respectively, were taken as the investigation objects. At first, the theoretical destruction ranges of single cutting holes under the three different charge diameters were computed. The computed results showed that the destruction range of the cutting holes could be expanded by increasing the charge diameter, which would be beneficial to the destruction of the rock far away from the cutting holes in the cutting cavity. Subsequently, numerical simulations of cutting blasting under the three different charge diameters were performed to display the dynamic propagation process of the blasting stress wave. Importantly, the stress field intensity in the cutting cavity was enhanced significantly with the charge diameter. The stronger stress field intensities generated by the larger diameter charges were more conducive to breaking the rock in the cutting cavity into small fragments that were easy to be discarded. Ultimately, a hard rock vertical slope was used instead of the driving face to carry out the cutting blasting experiments, and the hole utilizations of the cutting blasting were 70.4%, 82.0%, and 94.0%, respectively, under the three different charge diameters, from small to large. The experimental results forcefully substantiated that a higher cutting blasting efficiency could be achieved by increasing the charge diameter of cutting holes in hard rock mine tunnels.

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Study on Optimization of Delay Method of Wedge Cut Blasting in Tunnel

Cited by 3 publications

References 24 publications

Research on the mechanism and application of wedge cutting blasting with hole-inner delay

Research on the mechanism and application of wedge cutting blasting with hole-inner delay

Vibration Reduction and Explosion Control Investigation for an Ultra-Shallow Buried Tunnel under Crossing Buildings Based on HHT Analysis

Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge Diameters

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