Dynamic Cracking Behaviors and Energy Evolution of Multi-flawed Rocks Under Static Pre-compression

Yan, Zelin; Dai, Feng; Zhu, Jianbo; Xu, Yongbin

doi:10.1007/s00603-021-02564-2

Cited by 77 publications

(15 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the fracture angle also affects the dynamic strength of the fractured rock mass. Dai et al [ 36 ] carried out an experimental study of dynamic and static coupling loading using a fractured rock mass. The result revealed that the coupling strength initially decreased with increasing fracture inclination, reached a minimum at approximately 45°, and then increased with increasing fracture inclination.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mechanical and Fracture Behavior of Parallel Double Flawed Granite Material under Impact with Digital Image Correlation

Zhang

Chen

et al. 2023

Materials

View full text Add to dashboard Cite

During the excavation of underground projects, the rock masses left as the bearing support system are also subjected to dynamic loads from the excavation activities ahead. These rock masses have been damaged and fractured during the initial exposure (dynamic loads) and are subjected to static loads in the subsequent process as the support system. In this study, granite rock samples and specimens with different angles were produced, preloaded with different confining pressure, and under a combination of dynamic and static loading tests using a modified dynamic and static loading system: split Hopkinson pressure bar (SHPB). The peak strain and dynamic modulus of elasticity are weakened by the inclination angle in a similar way to the strength, with the specimens showing an evolutionary pattern from tensile strain to shear damage. The change in the inclination angle of flaws would weaken the dynamic and combined strengths, and a larger inclination flaw results in a significant decrease in its strength. Fractal analysis revealed that the fractural dimension was closely related to the fissure angle and showed a good linear correlation with the strain rate. This study will provide an important security assurance for deep mining.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mechanical and Fracture Behavior of Parallel Double Flawed Granite Material under Impact with Digital Image Correlation

Zhang

Chen

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…Yan et al [28] studied the efects of precompression and strain rate on dynamic strength and cracking behavior of single disturbed rock samples by static-dynamic coupling loading test. Yan et al [29] carried out static-dynamic coupling compression tests on multidefect rock samples. Te efects of prestress ratio, crack dip angle, and strain rate on dynamic progressive cracking mechanism and energy evolution of multicrack rock were studied.…”

Section: Introductionmentioning

confidence: 99%

Study on Characteristics of Acoustic Emission b Value of Coal Rock with Outburst-Proneness under Coupled Static and Dynamic Loads

Zhang

Ren

et al. 2023

Shock and Vibration

View full text Add to dashboard Cite

In this paper, a rock dynamic and static triaxial mechanical test system is adopted to conduct triaxial compression failure acoustic emission test on coal rock with outburst-proneness. The purpose is to study the evolution law of the acoustic emission (AE) b value of coal rock under static and dynamic load of varying frequencies. The test results show that the dynamic load disturbance will accelerate the instability failure process of coal rock, that the average stress level/ultimate strain of coal rock decline/rises correspondingly with the increasing dynamic load frequency. Moreover, the overall AE b value after dynamic load disturbance is relatively low, and the higher the dynamic load frequency, the larger the decrease in the b value. In addition, as the dynamic load frequency increases, the AE ringing count and AE energy show a trend of first increasing and then decreasing, and they are negatively correlated with the evolution characteristics of the acoustic emission b value. Furthermore, the change rule of AE b value is closely related to the instability and failure process of coal rock. A second-stage of the overall b value of acoustic emission shows a “cliff jumping type” decrease dip angle or “fault cliff type” decrease dip angle indicates the imminent failure of coal rock, which can be used as an evaluation index for real-time monitoring of dynamic disasters of coal rock with outburst-proneness.

show abstract

“…Microwave damage was quantified using CT values to investigate further the effect of the initial damage on dynamic rock fragmentation. Yan et al [23,24] examined the dynamic cracking behavior and energy evolution of flawed rocks, considering that rocks in subsurface rock engineering are initially subjected to static tectonic stress or gravity stress and then to dynamic loading. In truth, the investigation of accumulated damage is not restricted to rocks [25].…”

Section: Introductionmentioning

confidence: 99%

“…Microwave damage was quantified using CT values to investigate further the effect of the initial damage on dynamic rock fragmentation. Yan et al [23,24] examined the dynamic cracking behavior and energy evolution of flawed rocks, considering that rocks in subsur- The constitutive model of rocks has become a difficult research task due to the discontinuity and non-uniformity of rock materials [2,29]. Numerous academics have contributed to rock dynamics by doing extensive theoretical research.…”

Section: Introductionmentioning

confidence: 99%

Effects of Accumulated Damage on the Dynamic Properties of Coal Measures Sandstone

Sha

et al. 2022

Minerals

View full text Add to dashboard Cite

The coupling effect of accumulated damage and impact load substantially affects the integrity of the surrounding rock structure in deep coal mining engineering, which has inhibited safe and effective coal mining. Therefore, dynamic compression tests were performed on coal measures sandstone specimens with accumulated damage using the SHPB device. The effects of a high strain rate and accumulated damage on the sandstone’s mechanical behavior and damage evolution were investigated. The results reveal that accumulated damage has a considerable impact on specimen stress–strain curves and lowers dynamic compressive strength and deformation modulus substantially. The sandstone failure mode looks to be shear failure from a macroscopic perspective, while it appears to be intergranular fracture between the mineral particles from a microscopic perspective. The macroscopic and microscopic failure mechanisms of the sandstone specimens likewise conformed to the energy absorption law. The accumulated damage factor and the accumulated damage correction coefficient were presented in order to construct a statistical damage constitutive model of rocks based on the Weibull distribution. This model provides a decent description of the effects of accumulated damage and the strain rate on sandstone’s mechanical behavior, with parameters that are all of evident physical significance.

show abstract

Dynamic Cracking Behaviors and Energy Evolution of Multi-flawed Rocks Under Static Pre-compression

Cited by 77 publications

References 54 publications

Experimental Investigation of Mechanical and Fracture Behavior of Parallel Double Flawed Granite Material under Impact with Digital Image Correlation

Experimental Investigation of Mechanical and Fracture Behavior of Parallel Double Flawed Granite Material under Impact with Digital Image Correlation

Study on Characteristics of Acoustic Emission b Value of Coal Rock with Outburst-Proneness under Coupled Static and Dynamic Loads

Effects of Accumulated Damage on the Dynamic Properties of Coal Measures Sandstone

Contact Info

Product

Resources

About