Effect of confining pressure on damage accumulation of rock under repeated blast loading

Wang, Haochen; Wang, Zhiliang; Wang, Jianguo; Wang, Shumin; Wang, Haoran; Yin, Yanguo; Li, Fang

doi:10.1016/j.ijimpeng.2021.103961

Cited by 71 publications

(22 citation statements)

References 27 publications

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“…The parameters of the rock HJC constitutive model are given in Table 1 . The parameters of the hard rock model are quoted in the literature 31 , and the soft rock model is quoted in the literature 32 .…”

Section: Research Methods and Model Parametersmentioning

confidence: 99%

The law of blast stress wave propagation and fracture development in soft and hard composite rock

Ding

Yang

Zhou

et al. 2022

Sci Rep

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The process of blasting stress wave propagation and crack propagation is directly affected by the physical properties of the rock mass and internal joints in the rock. In soft and hard rock layers, the blasting process is more complicated since the blasting stress wave needs to penetrate two kinds of rocks with different physical properties and the interface between soft rock and hard rock. In this study, the modal transformation of stress waves at the interface of layered composite rock was analyzed, and the process was reproduced by finite element analysis. Furthermore, the development law of cracks was explored. The research results demonstrated that in the single blasting-hole model, a triangular crack area caused by reflected stress waves appeared at the rock interface of rock medium I near the blast hole. In rock medium II, the tensile crack generated by the interface wave appeared on the side away from the blast hole. Besides, the development of the tensile crack was associated with the incident mode of the blast stress wave and the incident angle. In the deep hole blasting model, the incidence of the detonation wave front from hard rock to soft rock promoted the fragmentation of the hard rock.

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Section: Research Methods and Model Parametersmentioning

confidence: 99%

The law of blast stress wave propagation and fracture development in soft and hard composite rock

Ding

Yang

Zhou

et al. 2022

Sci Rep

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“…The parameters for the p-α equation of state are determined by Equations ( 5)- (8). The remaining parameters can be determined based on the results of coal testing and preliminary research [20,21,30]. The final RHT model parameters of the simulation coal mass are obtained, as shown in Table 1.…”

Section: Determination Of the Residual Parameters Of The Rht Modelmentioning

confidence: 99%

“…The numerical results indicate that the crack propagation trends to develop in the direction of the applied high in-situ stress. Wang et al [20] investigated the effect of in-situ stress on rock crack propagation under repeated blasting loading. They found that when the difference between the horizontal and vertical stress is large, the crack propagation in the low in-situ stress direction is not significant under repeated blasting loading.…”

Section: Introductionmentioning

confidence: 99%

Study on the Stress Field and Crack Propagation of Coal Mass Induced by High-Pressure Air Blasting

et al. 2022

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High-pressure air blasting (HPAB) is one type of physical blasting technique that enhances the extraction rate of coalbed methane by impacting the coal mass with high-pressure gas to create cracks within it. First, based on the physical and mechanical parameters of the simulated coal rock mass, the RHT constitutive model of the coal rock mass was established, and its parameters were determined. Then, the laws of crack propagation and stress wave decay in coal induced by high-pressure air blasting were revealed by comparing the effect with that of equivalent explosive blasting. Next, the HPAB experiment was simulated to explore the coal crack propagation law under in-situ stress conditions. Finally, the HPAB experiment was carried out and the results of this experiment were compared with the numerical simulation results. The results indicate that the crack propagation induced by high-pressure air blasting is considered as two major stages, i.e., the crack initiation and crack propagation stage induced by the stress wave and the crack stable propagation stage induced by the duration high-pressure gas. In the case of equal energy, the peak stress wave of high-pressure gas is smaller, decays more slowly and has a longer action time, compared to explosive blasting. Therefore, the number of initial random cracks in coal mass induced by high-pressure air blasting is less, and the range of crack propagation induced by high-pressure air blasting is larger. When λ = 0 (λ is the ratio of the horizontal in-situ stress to the vertical in-situ stress), the in-situ stress in the coal seam can promote the propagation of vertical cracks but inhibit the propagation of horizontal cracks. When λ = 0.5 and 1, the in-situ stress inhibits the propagation of both horizontal and vertical cracks.

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“…They studied the blast-induced damage evolution under various stress field conditions and analyzed the challenges faced by deep rock excavation. Wang et al. (2021a) studied the influences of surrounding pressure on blasting damage through theoretical, experimental and numerical analyses and conducted numerical simulations of rock slope pre-cracking blasting to explore the damage behavior of rock mass under various initial stress conditions.…”

Section: Introductionmentioning

confidence: 99%

Physical model test and numerical simulation study of cumulative damage to deep tunnel surrounding rock under cyclic blasting load

Huang

Chen

Liu

et al. 2022

International Journal of Damage Mechanics

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Cyclic blasting excavation of a deep tunnel frequently disturbs the surrounding rock, and cumulative damage effect will occur in cases multiple blasts are applied. To study the damage evolution trend of tunnel surrounding rock under multiple cyclic blasting load, a self-made physical model test system was used to test cyclic blasting excavation of a tunnel under high in-situ stress. Meanwhile, according to the characteristic that the damage of rock under frequent disturbance will appear cumulative superposition, an improved Bingham creep damage constitutive model was established. The constitutive model was applied to the numerical simulation of tunnel cyclic blasting excavation, and the numerical simulation reproduced the physical model test to study the rock damage evolution laws. The results from the physical model test and the numerical simulation revealed that the process of damage evolution of rock in in-situ stress state under the impact of multiple blasting disturbances had a non-linear cumulative characteristic. In addition, the results also shed light on the relationship between the damage zone expansion and the number of cyclic blast. This paper can provide a reference for studies of the damage evolution in deep rock under blasting impact.

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Effect of confining pressure on damage accumulation of rock under repeated blast loading

Cited by 71 publications

References 27 publications

The law of blast stress wave propagation and fracture development in soft and hard composite rock

The law of blast stress wave propagation and fracture development in soft and hard composite rock

Study on the Stress Field and Crack Propagation of Coal Mass Induced by High-Pressure Air Blasting

Physical model test and numerical simulation study of cumulative damage to deep tunnel surrounding rock under cyclic blasting load

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