Fracture Characteristics and Geometric Fractal of Damaged Sandstone under Impact Load

Hu, Hao; Zheng, Qiangqiang; Gao, Xin; Cheng, Bing; Wang, Qianqian; Ni, Xingjie

doi:10.1155/2020/6617197

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…Following the SHPB experimental setup, Huang et al [18] studied the fractal fragmentation characteristics of sandstones with different water contents and obtained the relationship between fractal dimension and water content and energy consumption. By subjecting cyclic loading to sandstone specimens and combining fractal theory with energy consumption principles, Hu et al [19] studied the crushing bulk and energy dissipation. Deng et al [20] conducted impact loading tests on granite and sandstone and analysed dissipation characteristics with fractal theory.…”

Section: Introductionmentioning

confidence: 99%

Study on the Fractal Characteristics of the Pomegranate Biotite Schist under Impact Loading

Wang

Zuo

et al. 2021

Geofluids

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In order to study the fractal characteristics of the pomegranate biotite schist under the effect of blasting loads, a one-dimensional SHPB impact test was carried out to test the dynamic compressive strength, damage morphology, fracture energy dissipation density, and other parameters of the rocks under different strain rates; besides, sieve tests were conducted to count the mass fractal characteristics of the crushed masses under different strain rates to calculate the fractal dimension of the crushed rock D . Finally, the relationships between fractal dimension and dynamic compressive strength, crushing characteristics, and energy dissipation characteristics were analysed. The results show that under different impact loads, the strain rate effect of the rock is significant and the dynamic compressive strength increases with the increasing strain rate, and they show a multiplicative power relationship. The higher the strain rate of the rock, the deeper the fragmentation and the higher the fractal dimension, and the fractal dimension and rock crushing energy density are multiplied by a power relationship. By performing the comparative analysis of the pomegranate biotite schist, a reasonable strain rate range of 78.75 s-1~82.51 s-1 and a reasonable crushing energy consumption density range of 0.78 J·cm-3~0.92 J·cm-3 were determined. This research provides a great reference for the analysis of dynamic crushing mechanism, crushing block size distribution, and crushing energy consumption of the roadway surrounding rock.

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Section: Introductionmentioning

confidence: 99%

Study on the Fractal Characteristics of the Pomegranate Biotite Schist under Impact Loading

Wang

Zuo

et al. 2021

Geofluids

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“…Liu et al [17][18][19][20][21][22] analyzed shales under complex geological conditions; simulation software pEDFM was used to construct analytical models for controlling the connection and optimization between volumes. Zhang et al [23][24][25][26][27][28][29] carried out SHPB tests on sandstone under different impact conditions and obtained stress-strain curves and rock fragmentation, and the peak strain, particle size distribution, and energy dissipation of sandstone were further analyzed. Metamorphic limestone is one of the main lithologies in the Dahongshan mining area in Yuxi city, Yunnan province; the existing static parameters cannot meet the needs of mine production and scientific research modeling.…”

Section: Introductionmentioning

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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“…However, the duration of impact load acting on rock is very short, so the inertial interaction between media in this time scale cannot be ignored. Based on the dynamic constitutive relationship, dynamic strength change, strain rate sensitivity, and elastic modulus of rock, many scholars carry out dynamic mechanical tests [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Energy Dissipation Characteristics of Damaged Sandstone under Impact Load

Feng

Wang

et al. 2021

Shock and Vibration

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Before rock burst, coal, and gas outburst dynamic load, rock mass in geotechnical engineering has been an indifferent degree of damage. The dissipation energy of rock mass under dynamic load reflects the difficulty of rock breaking. In view of the energy dissipation of damaged rock mass under dynamic load, the cyclic loading and unloading test is carried out to make sandstone in different damage states, and the damage degree of sandstone is characterized by the change of longitudinal wave velocity before and after cyclic loading and unloading. Then, the rock with different damage degrees is tested by adopting the split Hopkinson pressure bar (SHPB). Finally, the energy dissipation characteristics of damaged rock under impact load are analyzed. The results show that the damage factor of sandstone increases with the increase of the upper limit of stress after cyclic static loading. The dynamic strength and peak strain of damaged sandstone increase with the increase of impact pressure and decrease with the increase of damage degree. With the increase of damage degree of sandstone, the reflection energy and dissipation energy of sandstone increase, while the transmission energy decreases.

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Fracture Characteristics and Geometric Fractal of Damaged Sandstone under Impact Load

Cited by 5 publications

References 28 publications

Study on the Fractal Characteristics of the Pomegranate Biotite Schist under Impact Loading

Study on the Fractal Characteristics of the Pomegranate Biotite Schist under Impact Loading

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

Analysis of Energy Dissipation Characteristics of Damaged Sandstone under Impact Load

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