Directional fracture behavior and stress evolution process of the multi-slit charge blasting

Ding, Chuanxian; Yang, Renshu; Xiao, Chenglong; Chen, Jianhua; Wang, Desheng; Gong, Min; Feng, Chun

doi:10.1016/j.soildyn.2021.107037

Cited by 21 publications

(3 citation statements)

References 14 publications

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“…To date, finite element simulations have been rapidly developed and widely used in engineering fields, especially in solving problems related to engineering blasting [34][35][36] . In this study, finite element models of conventional and innovative wedge cutting patterns were established by using eight node solid elements in the ANSYS program.…”

Section: Finite Element Modelmentioning

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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Section: Finite Element Modelmentioning

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 addition, due to the limitations of the experiment, some scholars have carried out numerical simulation and application research on the directional fracture blasting of slotted cartridge. For example, Ding et al 21 studied the influence of multiple slits on the stress evolution and blasting vibration of slotted cartridge blasting through numerical simulation. Shen Tao 22 constructed a slotted cartridge blasting model by means of numerical simulation, and analyzed the expansion process of detonation products in the initial stage of explosion and the damage process of blast hole wall rock caused by explosion load in the middle stage of explosion.…”

Section: Introductionmentioning

confidence: 99%

Study on the influence of slit structure on safe and efficient directional fracture blasting effect

Tian,

Zhang,

Lin

et al. 2023

Sci Rep

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In order to study the influence of slit structure on the blasting effect of slit charge, the super dynamic strain test system and photographic equipment were used to study the dynamic response of slit charge blasting and the distribution of blasting cracks under different slit shapes and slit angles. The results show that changing the shape of the slit does not make the energy-gathering and damage-reducing blasting effect of the slit cartridge disappear, but it will affect its effect. Compared with the round hole slit, the peak strain in the slit direction of the strip slit cartridge blast is larger, the directional crack forming is more obvious, and the blasting effect is better. The energy accumulation and loss reduction effect of the blasting of the strip slotted cartridge increase first and then decrease with the increase of the slit angle. When the slit angle is 20°, the energy accumulation and loss reduction effect of strip slit charge blasting are the largest, the distribution of blasting cracks is the best, and the directional fracture blasting effect of slit charge is the best. Finally, based on the research results of model test, combined with the actual situation of the construction site, the slotted cartridge is applied to the pre-splitting blasting of open-pit slope. Compared with the ordinary cartridge pre-splitting blasting, the slope roughness after blasting is reduced by 46.2%, the half-hole rate of blast hole is increased by 20.5%, the blasting vibration intensity is reduced by 60.3%, and the directional fracture control blasting effect is good.

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“…The interplay between a propagating crack tip and the dynamic stress field engenders a spectrum of dynamic crack behaviors, including fluctuations in propagation velocity. Typically, crack propagation occurs at a significantly slower pace than the speed of the stress wave, leading to crack arrest either when the dynamic stress wave disengages from the advancing crack or when stress levels prove insufficient to sustain further propagation [21]. The dynamic stress field emerges as a consequence of the perturbation caused by the stress wave's interaction with the proximal crack tip and its surface.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of the Dynamic Crack Behavior of Brittle Material Induced by Blast Waves

Yu,

Zou,

Sun

et al. 2023

Materials

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Blast stress waves profoundly impact engineering structures, exciting and affecting the rupture process in brittle construction materials. A novel numerical model was introduced to investigate the initiation and propagation of cracks subjected to blast stress waves within the borehole-crack configuration. Twelve models were established with different crack lengths to simulate sandstone samples. The influence of crack length on crack initiation and propagation was investigated using those models. The linear equation of state was used to express the relationship between the pressure and density of the material. The major principal stress failure criterion was used to evaluate the failure of elements. A triangular pressure curve was adopted to produce the blast stress wave. The results indicated that the pre-crack length critically influenced the crack initiation and propagation mechanism by analyzing the stress history at the crack tip, crack propagation velocity, and distance. The inducement of a P-wave and S-wave is paramount in models with a short pre-crack. For long pre-crack models, Rayleigh waves significantly contribute to crack propagation.

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Directional fracture behavior and stress evolution process of the multi-slit charge blasting

Cited by 21 publications

References 14 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

Study on the influence of slit structure on safe and efficient directional fracture blasting effect

A Numerical Study of the Dynamic Crack Behavior of Brittle Material Induced by Blast Waves

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