Impact Dynamic Properties and Energy Evolution of Damaged Sandstone Based on Cyclic Loading Threshold

Zheng, Qiangqiang; Hu, Hao; Yuan, Anying; Li, Mengyao; Wang, Haibo; Wang, Mengxiang; Qi, Zong; Shouyang, Zhang

doi:10.1155/2020/6615602

Cited by 11 publications

(6 citation statements)

References 37 publications

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“…Current researches mostly focus on the dynamic response of rock or rock mass structure under a single impact. However, there are repeated dynamic loading processes in blasting excavation and hard rock formation induced cracking and in the surrounding rock of roadways with rock burst [13,14]. erefore, the study of the dynamic characteristics of sandstone under cyclic impact load is of great theoretical and practical significance for blast-induced cracking control and the stability of roadway surrounding rock [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Mechanical Characteristics and Energy Evolution of Sandstone under Cyclic Impact Loading

Gao

Xia

Wang

et al. 2022

Shock and Vibration

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In order to study the dynamic mechanical properties of the surrounding rock of roadway in deep mines with rock burst, cyclic impact compression tests of sandstone under different impact velocities were carried out by using the split Hopkinson pressure bar (SHPB) test system, and the dynamic stress-strain curves of the samples under cyclic impact loads and the relationship between energy dissipation and impact numbers were analyzed. The results show that, as the impact loading times increase, the initial elastic modulus of sandstone samples decreases, the peak stress decreases, and the peak strain increases; the average strain rate increases. The cumulative damage of sandstone samples under impact load is significantly affected by impact velocity and times. During the cyclic impact test, the reflected energy of sandstone increases with the increase of impact numbers, while the transmitted energy decreases and the absorbed energy increases; the cumulative specific energy absorption variable is introduced, and the cumulative specific energy absorption value of the samples increases with the increase of impact numbers, which can better characterize the variation of energy accumulation and dissipation of sandstone samples under cyclic impact.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Mechanical Characteristics and Energy Evolution of Sandstone under Cyclic Impact Loading

Gao

Xia

Wang

et al. 2022

Shock and Vibration

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“…As the most common load-bearing medium, rock widely exists in geotechnical engineering, such as mine surrounding rock tunnels and underground protection projects [1][2][3][4][5][6][7]. Affected by human excavation activities, rock masses are in varying degrees of damage under the disturbance of cyclic loads with different upper-stress limits [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Energy Dissipation of Sandstone under Cyclic Loading‐Unloading

Xie

et al. 2021

Shock and Vibration

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For the bearing rock in geotechnical engineering, it is frequently affected by external loads. This paper adopted different upper limits of stress to carry out cyclic loading-unloading on the sandstone specimens to make them in different damage degrees and analyzed the mechanical mechanism of the damaged sandstone under different stresses. Then, the strength change and energy evolution of sandstone with different damage degrees were analyzed, and the damage of the loaded sandstone was quantitatively characterized. The experimental results showed that the strength and plastic deformation of sandstone after cyclic loading-unloading with different upper-stress limits gradually decreased with the increase of the upper-stress limit. In the loading-unloading stages of cyclic loading-unloading, the elastic modulus increased with the increase of the upper-stress limit. In general, as the number of cycles increased, the total strain energy density and elastic deformation energy density gradually increased, and as the upper-stress limit increased, both of them also increased. The damage factor of sandstone after cyclic loading-unloading, which was characterized by dissipated energy, increased in an S-shape with the increase of the upper-stress limit, and the growth rate first increased and then decreased.

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“…Ma et al [11][12][13] conducted dynamic impact tests on artificially frozen sand and shale under active confining pressure, and the changes of stress-strain curves and strength parameters with confining pressure and strain rate were studied. Ji et al [14][15][16] conducted dynamic impact tests on granite and sandstone and analyzed the relationship between the fracture degree, strength parameters, energy dissipation, and strain rate of the two materials under different strain rates. 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.…”

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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Impact Dynamic Properties and Energy Evolution of Damaged Sandstone Based on Cyclic Loading Threshold

Cited by 11 publications

References 37 publications

Experimental Study on Dynamic Mechanical Characteristics and Energy Evolution of Sandstone under Cyclic Impact Loading

Experimental Study on Dynamic Mechanical Characteristics and Energy Evolution of Sandstone under Cyclic Impact Loading

Mechanical Properties and Energy Dissipation of Sandstone under Cyclic Loading‐Unloading

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

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