Damage evolution and fragmentation behavior of pyramid cut blasting under uniaxial compression

Chen, Siyu; Yang, Aiyun; Huang, Chen; Xie, Huanzhen

doi:10.1007/s11629-021-6809-0

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…Hu et al 22 generated a solid model of wedge cutting patterns and simulated the forming process of cutting cavities by defining the rock strength as the element failure threshold. Chen et al 23 carried out numerical analyses and model experiments of wedge cutting blasting under unidirectional pressure and described the adverse effects of unidirectional pressure on damage evolution, cavity volume, and block distribution. Using numerical simulation and full-scale tests, Cheng et al 24 and Gao et al 25 investigated the effect of the charge diameter on hard rock wedge cutting blasting and concluded that increasing the charge diameter could aggravate the breaking degree of the rock mass.…”

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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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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