Effect of Static - Dynamic Coupling Loading on Fracture Toughness and Failure Characteristics in Marble

Yin, Z; Ma, H. F.; Hu, Z. X.; Zou, Ying

doi:10.25103/jestr.072.25

Cited by 21 publications

(9 citation statements)

References 10 publications

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“…The crushed bodies are mostly a lamellar spall structure, columnar split structure, and cone structure. At this time, the crack penetrates the entire specimen [45]. When the strain rate Figure 7: Failure modes of metamorphic limestone under different strain rates.…”

Section: Stress-strainmentioning

confidence: 99%

Study on the Dynamic Mechanical Properties of Metamorphic Limestone under Impact Loading

et al. 2021

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To study the dynamic damage and fracture of metamorphic limestone under explosive load and the stability of the surrounding rock, the stress-strain curve, fracture morphology, and energy dissipation characteristics of metamorphic limestone in the Dahongshan mining area under different strain rates were studied by the Hopkinson pressure bar (SHPB), stress wave analysis, and fractal theory. The experimental results show that the crushing form and degree are significantly affected by the loading strain rate. There are several typical failure modes. When the strain rate is 17.56 s−1, there is no obvious failure except corner cracks. When the strain rate is between 26.92 s−1 and 56.18 s−1, the failure mode of the specimen is axial splitting failure, and when the strain rate is 67.34 s−1, splitting and shearing failure occur. With the increase of the strain rate, the growth rate of the dynamic compressive strength slows down. Compared with static compressive strength, the strength factor increases from 1.15 to 4.19. Also, the fractal dimension shows a gentle increase. When Df is in the range of 1.82~2.24, there is a sudden change in fragmentation when the strain rate is in the range of 34.70 s−1~56.18 s−1. Energy dissipation density increases logarithmically with the strain rate. The results reveal the dynamic breaking and energy consumption laws of metamorphic limestone under impact loads with different strain rates and could provide some reference value for the safe and efficient construction in the Dahongshan mining area and similar engineering projects.

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Section: Stress-strainmentioning

confidence: 99%

Study on the Dynamic Mechanical Properties of Metamorphic Limestone under Impact Loading

et al. 2021

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“…In previous studies, dynamic mechanical properties of rocks under coupled static and dynamic stress conditions were investigated using the modified SHPB equipment [20,21]. In this study, a novel experimental system (Fig.…”

Section: Coupled Gas-dynamic Loading Equipmentmentioning

confidence: 99%

Experimental Study on the Static and Dynamic Mechanical Properties of Coal under Different Gas Pressures

Zhiqiang¹,

Zhang²,

Ma³

et al. 2018

JESTR

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In deep coal mines, a coal seam usually contains high gas pressure and is subjected to static and dynamic loading due to mining-induced stress and sudden fracture of hard roof. In this study, two experimental equipment of gas-containing coal under static and dynamic loading was developed for the investigation of the static and dynamic mechanical properties of coal under various gas pressures. The first one was gas-solid coupling equipment with quasi-static loading developed on the basis of the RMT-150 testing machine. The other one was coupled gas-dynamic loading equipment modified from a split Hopkinson pressure bar. By using the modified equipment, the static and dynamic compressive strengths of coal were tested under four gas pressures, namely, 0, 0.5, 1.0, and 1.5 MPa, respectively. Results show that gas pressure clearly affects the stress-strain curve and strength of coal. As the initial gas pressure increases from 0 MPa to 1.5 MPa, the static strength decreases from 23.95 MPa to 13.28 MPa, and the dynamic strength also decreases from 41.78 MPa to 32.21 MPa. The failure strain of the specimen decreases from 0.90 to 0.51 under the static loading and increases from 0.56 to 0.74 under the dynamic loading. Meanwhile, the average dynamic increase factor (DIF) of compressive strength increases from 1.78 to 2.34 as the initial gas pressure increases. However, the gas influence factor (GIF) of compressive strength decreases from 1.00 to 0.77. The phenomena suggest that the mechanical property of coal under static loading is more sensitive to gas pressure than under dynamic loading, indicating the prominent influence of the loading mode on the failure mode of gas-containing coal. Hence, the results can provide an experimental basis for studies of the mechanisms of coal and gas outburst in deep coal mines.

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“…With the increase in step height, the resistance line of the chassis on the front row of blast holes is doubled. Lastly, the unit consumption of explosives become much higher than ordinary [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Air Deck Blasting Parameters on the Basis of the Holmquist-Johnson-Cook Constitutive Model

Yin¹,

Wang²,

Wang³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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The present study considers the so-called air deck blasting, one of the most commonly used techniques for the improvement of blasting efficiency in mining applications. In particular, it aims to improve the operating conditions of large-scale equipment, increase the efficiency of the slope enlarging process, and reduce the mining cost. These objectives are implemented through a two-fold approach where, first, a program for slope enlarging based on the middle air-deck charge blasting-loosening technology is proposed, and second, the physical mechanism responsible for the stress wave attenuation in the rock is analyzed in the framework of a Holmquist-Johnson-Cook constitutive model. Field test results verify that the proposed approach is highly efficient and economical when used in medium-hard rock blasting and thus provides a basis for the practical implementation of slope enlargement for high benches in Open-Pit Mines.

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Effect of Static - Dynamic Coupling Loading on Fracture Toughness and Failure Characteristics in Marble

Cited by 21 publications

References 10 publications

Study on the Dynamic Mechanical Properties of Metamorphic Limestone under Impact Loading

Study on the Dynamic Mechanical Properties of Metamorphic Limestone under Impact Loading

Experimental Study on the Static and Dynamic Mechanical Properties of Coal under Different Gas Pressures

Optimization of the Air Deck Blasting Parameters on the Basis of the Holmquist-Johnson-Cook Constitutive Model

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