Numerical study of the contributions of shock wave and detonation gas to crack generation in deep rock without free surfaces

Yuan, Wei; Su, Xuebin; Wang, Wei; Wen, Lei; Chang, Jiangfang

doi:10.1016/j.petrol.2019.02.004

Cited by 38 publications

(16 citation statements)

References 14 publications

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“…e physical attenuation coefficient decreased with the number of small, open cracks. When the confining pressure increased from 4 MPa to 10 MPa (i.e., 23% to 57% of the uniaxial compressive strength of the material), new cracks appeared with the expansion of the closed crack inside the material, causing sliding under the stress wave; this phenomenon is verified in the previous research [21]. en, the physical stress attenuation coefficient increased with the number of small, open cracks.…”

Section: Analysis On Intact Rock Masssupporting

confidence: 73%

Attenuation Law of Stress Waves in Cracked Rock Mass under Different Confining Pressures

Lou

Luo

2019

Advances in Civil Engineering

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Through theoretical analysis and indoor model tests, this paper explores the attenuation law of stress waves in the intact confined rock mass and cracked rock mass under different confining pressures, especially the relationship between the stress attenuation coefficient, crack width, and crack angle, respectively. The tests were carried out on a triaxial test system for deep rock mass, which supports both static and dynamic loading. The research results show that the physical attenuation of the stress wave in the intact rock mass first decreases and then increases with the increase of the confining pressure and decreases with the increase of crack width. The attenuation coefficient of stress waves in the cracked rock mass depends on the crack angle and crack width. Specifically, the coefficient is negatively correlated with crack width; under no confining pressure, the coefficient decreases with the increase of the crack angle; when the confining pressure is on a moderate level, the coefficient increases with the crack angle; when the confining pressure exceeds the uniaxial intensity by 34%, the coefficient decreases again with the increase of the crack angle. The theoretical propagation equation of stress waves at the crack, which was derived from the propagation attenuation mechanism of stress waves in the cracked rock mass, was proved feasible through the comparison against the experimental results.

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Section: Analysis On Intact Rock Masssupporting

confidence: 73%

Attenuation Law of Stress Waves in Cracked Rock Mass under Different Confining Pressures

Lou

Luo

2019

Advances in Civil Engineering

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“…or as separate particles bonded at contact point if modeling of discontinuities is required. In such cases, DEM [88][89][90][91][92][93], the bonded particle model [94] or hybrid methods [95][96][97][98][99] are used for numerical analysis. Typically, due to the high volume of calculations required in such methods, calculations are performed using software packages to simulate the model.…”

Section: Numerical Approachmentioning

confidence: 99%

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

et al. 2020

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This paper presents a review of the existing models for the estimation of explosion-induced crushed and cracked zones. The control of these zones is of utmost importance in the rock explosion design, since it aims at optimizing the fragmentation and, as a result, minimizing the fine grain production and recovery cycle. Moreover, this optimization can reduce the damage beyond the set border and align the excavation plan with the geometric design. The models are categorized into three groups based on the approach, i.e., analytical, numerical, and experimental approaches, and for each group, the relevant studies are classified and presented in a comprehensive manner. More specifically, in the analytical methods, the assumptions and results are described and discussed in order to provide a useful reference to judge the applicability of each model. Considering the numerical models, all commonly-used algorithms along with the simulation details and the influential parameters are reported and discussed. Finally, considering the experimental models, the emphasis is given here on presenting the most practical and widely employed laboratory models. The empirical equations derived from the models and their applications are examined in detail. In the Discussion section, the most common methods are selected and used to estimate the damage size of 13 case study problems. The results are then utilized to compare the accuracy and applicability of each selected method. Furthermore, the probabilistic analysis of the explosion-induced failure is reviewed using several structural reliability models. The selection, classification, and discussion of the models presented in this paper can be used as a reference in real engineering projects.

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“…On one hand, the stress inside the gas cavity is redistributed, while on the other hand, it continues to expand. Consequently, the rock medium is driven by strong compressed gas and flies out in the direction of minimum resistance, realizing plane directional casting [24,25]. By researching the law of rock block casting motion under the plane charge method with larger powder factor and smaller extension size, the results show that the cavity is bulging at the final stage, and the rocks surrounding the blast hole disperse around the centre of the plane charge at a decreasing speed.…”

Section: Plane Charge Methods In Overburden Blast-castingmentioning

confidence: 99%

Blast-Casting Mechanism and Parameter Optimization of a Benched Deep-Hole in an Opencast Coal Mine

Lai

Zhang

et al. 2020

Shock and Vibration

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During the research on bench deep-hole blast casting, the blast-casting parameters are directly related to the blast-casting results, so it could reveal the mechanism for improving the effect thereof. Based on the principle of the plane charge method, both the stress wave and detonation gas were considered to affect rock fragmentation and casting, a model of overburden fragmentation and casting process around the blasting hole was established, and bench deep-hole blast-casting behaviours were elucidated. By using the Factor Analysis Method (FAM), a correlation analysis model of factors influencing blast-casting results was built. The results proved that powder factor (or specific charge) ranked first in terms of its influence, followed by hole spacing, minimum resistance line, burden, and bench height. The formulae for calculating the limit powder factor value and the spacing of blasting holes were derived for different rock properties. The results showed that the optimum hole spacing was no more than 12.49 m and the powder factor was no more than 0.75 kg/m3, and it proved that an effective casting percentage (ECP) of 34% could be realized.

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Numerical study of the contributions of shock wave and detonation gas to crack generation in deep rock without free surfaces

Cited by 38 publications

References 14 publications

Attenuation Law of Stress Waves in Cracked Rock Mass under Different Confining Pressures

Attenuation Law of Stress Waves in Cracked Rock Mass under Different Confining Pressures

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

Blast-Casting Mechanism and Parameter Optimization of a Benched Deep-Hole in an Opencast Coal Mine

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