Dynamic response of pre-stressed rock with a circular cavity subject to transient loading

Tao, Ming; Ma, Ao; Cao, Wenzhuo; Li, Xibing; Gong, Fengqiang

doi:10.1016/j.ijrmms.2017.09.003

Cited by 112 publications

(39 citation statements)

References 25 publications

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“…e analysis shows that, in addition to the influence of mineral composition, structure, and type of cementation, rock mechanical properties are also influenced by the water environment [19,20]. Ogata et al [21] show that the tensile strength of rocks with high porosity on the water saturation condition was decreased on both static and dynamic condition.…”

Section: Mechanism and Discussionmentioning

confidence: 99%

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Wen

Zhang

et al. 2019

Advances in Civil Engineering

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e natural and water-saturated states of coal samples under static and static-dynamic loads were tested using the Split-Hopkinson pressure bar (SHPB) method and RMT-150 system, respectively. e differences in the strength reduction coefficient and elastic modulus reduction coefficient of water-saturated coal samples under static and static-dynamic loads were discussed. e experimental results for coal were compared with the corresponding characteristics of typical sandstone samples under static and static-dynamic loads. Furthermore, a fracture model of a hydrous wing branch fracture under static-dynamic loading was established based on the theory of fracture damage mechanics. e difference in dynamic strength between coal and sandstone samples for both the natural state and water-saturated state was analyzed. On this basis, the effect of water on the fracture surface of coal and the tensile strength and shear strength of the branch fracture surface were fully considered. In addition, criteria of the branch fracture surface for crack initiation and crack arrest were also established. Finally, the phenomenon of increasing elastic modulus in saturated coal samples was explained with this criterion.

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Section: Mechanism and Discussionmentioning

confidence: 99%

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Wen

Zhang

et al. 2019

Advances in Civil Engineering

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“…Then, they described the effects of frequency and interface stiffness on the dynamic stress concentration. Tao et al used a prestressed Split Hopkinson bar system to simulate the dynamical excitation of shock wave in deep rock tunnels and obtained the damage rule around the holes under the conditions of dynamic loading coupled with prestress.…”

Section: Introductionmentioning

confidence: 99%

Stress redistribution of dynamic loading incident with arbitrary waveform through a circular cavity

Tao

Cao³

et al. 2019

Num Anal Meth Geomechanics

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Summary In actual geotechnical and civil engineering, dynamic stress concentrations around cavities generated by wave sources widely exist. In this study, based on the complex variable theory and Fourier transform method, the expression of the dynamic stress concentration factor (DSCF) around a circular cavity in infinite homogeneous media subjected to transient waves with arbitrary waveform is obtained. The relationships between both steady‐state and transient DSCF and their waveform parameters are investigated quantitatively. The results indicate that a relatively large tensile stress is generated with low Poisson's ratio under steady‐state incidence. Under the condition of transient incidence, the position of the wave peak has a minor effect on the DSCF in the case of small wavenumber, but it has a significant effect in the opposite case. It is found that when the wavenumber is high, such as 0.5, the stress response lags behind the stress wave. In addition, the closer the wave peak to the center of the waveform, the greater the potential damage of the transient incidence.

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“…In practical rock engineering, rock mass is subjected to static load and will also be affected by dynamic loads [14], such as impact, seismic, explosion, earthquake, and blasting. At present, some research studies have been carried out on the dynamic mechanical response of rock [15][16][17][18][19]. Li et al [16] analyzed the cracking of single-crack marble specimen under impact loading based on experimental study.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al [16] analyzed the cracking of single-crack marble specimen under impact loading based on experimental study. For the difficulty of studying the failure process of underground rock, an experimental method is proposed to explore dynamic failure process of prestressed rock specimen with a circular hole [17]. Zhang et al [18] and Hao et al [19] studied the effects of bedding on the dynamic and static properties of coal and rock, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Mechanical and Energy Characteristics of Reinforced Rock under Dynamic Loading

Xin-xi

Liu

Zhao

et al. 2019

Shock and Vibration

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The properties of anchored surrounding rock may vary considerably under complex geological and stress conditions, especially dynamic loading in deep mining. Therefore, comprehensive study of the reinforced mechanism is required to prevent failures associated with deep mining. In this paper, with sandstone as matrix and steel bar as bolt, the dynamic compression test of reinforced rock was carried out by using a 50 mm rod diameter split Hopkinson pressure bar (SHPB) test device. The mechanical and energy characteristics of reinforced rock under dynamic loading were analyzed. The results show that the dynamic strength of reinforced sample is greater than that of unreinforced sample and increases with the increase of the strain rate. The reflected energy and absorbed energy increase with the increase of incident energy, while the transmitted energy increases slightly. The higher the strain rate, the larger the energy dissipation rate and the higher the degree of fragmentation. It shows that the energy dissipation characteristic reflects the internal damage process to some extent. Compared with the results of unreinforced samples, the reflected energy of reinforced samples significantly increases and the absorbed energy will significantly decrease. It can be seen that the bolt can reduce absorbed energy of surrounding rock, thereby improving the stability of roadway surrounding rock. The results may provide reference for the stability of deep roadway and support design.

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Dynamic response of pre-stressed rock with a circular cavity subject to transient loading

Cited by 112 publications

References 25 publications

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Stress redistribution of dynamic loading incident with arbitrary waveform through a circular cavity

Experimental Research on Mechanical and Energy Characteristics of Reinforced Rock under Dynamic Loading

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