The Influence of Joint Inclination and Opening Width on Fracture Characteristics of Granite under Triaxial Compression

Song, Leibo; Wang, Gang; Wang, Xingkai; Huang, Mingzhi; Xu, Kun; Han, Guansheng; Liu, Guangjian

doi:10.1061/(asce)gm.1943-5622.0002372

Cited by 29 publications

(14 citation statements)

References 29 publications

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“…It is found that the number of microseismic events was significantly reduced and the rockbursts were well controlled. From the explanation of rockburst mechanism, optimizing the construction scheme was to reduce the unloading or disturbance effect and the release of strain energy of surrounding rock, thereby reducing the risk of rockbursts [29][30][31]. Strengthening support was to improve the energy storage limit of surrounding rock and prevent the occurrence of rockbursts.…”

Section: Temporal Distribution Law Of Microseismic Eventsmentioning

confidence: 99%

Research on Temporal and Spatial Distribution Characteristics of Microseismic Events of Slip-Type Rockburst

Xu¹,

Song

Song³

et al. 2022

Shock and Vibration

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Based on the microseismic monitoring data of underground cavern of Shuangjiangkou Hydropower Station, the internal relationship between rockburst and microseismic events is analyzed and the occurrence mechanism of slip-type rockburst in underground cavern of Shuangjiangkou Hydropower Station is analyzed through the change of microseismic monitoring b value to warn the risk level of rockburst. The results show that microseismic events are closely related to excavation activities, and the change of b value reflects the rockburst risk level. The smaller the b value of microseismic events is, the more large magnitude events is and the greater the possibility of rockburst is. The slip-type rockburst was mainly affected by structural plane; it is due to the accumulation of elastic strain energy at the structural plane and the sudden release under the action of unloading or disturbance, driving the block on the structure surface fast slide, mainly manifested as the sliding of large blocks of surrounding rock, and forming a “V” shape pit blasting or cuneate blasting crater, as well as destruction with crackle. Compared with the strained rockburst, the damage is more serious. The research results can provide reference for rockburst prediction and prevention in similar deep rock engineering.

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Section: Temporal Distribution Law Of Microseismic Eventsmentioning

confidence: 99%

Research on Temporal and Spatial Distribution Characteristics of Microseismic Events of Slip-Type Rockburst

Xu¹,

Song

Song³

et al. 2022

Shock and Vibration

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“…ere are many factors leading to the formation of different types of strain rock burst. However, no matter how complex its internal mechanism is, rock burst is mainly controlled by two factors, namely lithological conditions and stress field conditions [9][10][11][12][13]. It is found that the deep rock mass is mostly hard brittle rock mass, which generally meets the requirements of lithological conditions when rock burst occurs.…”

Section: Influencing Factors Of Tunnel Surrounding Rock Failurementioning

confidence: 99%

Study on the Failure Mechanism of Strain Rockburst

Zhou

Wang

et al. 2022

Shock and Vibration

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Among the factors affecting rock mass failure, the stress state has the greatest influence on the mechanical behavior of rock. The mechanical behavior of rock depends on the change of stress path, and the stress of rock mass is closely related to deformation and failure. In order to study the influence of surrounding rock stress state on the failure mode of surrounding rock, based on the theory of elastic mechanics and fracture mechanics, this paper analyzed the stress state of surrounding rock element and crack propagation of surrounding rock, and estimated the potential failure mode of surrounding rock in different areas of a phosphate mine in Yichang. The results showed that: the surrounding rock element is affected by the gradient stress, and a larger stress gradient corresponds to a larger principal stress ratio and variation direction of the surrounding rock. The failure mode of surrounding rock is affected by the coupling effect of principal stress ratio and principal stress direction. Under the action of certain crack angle and appropriate confining pressure, different fracture mechanisms may occur in the surrounding rock compression. But the partition of surrounding rock failure mode region can predict the surrounding rock failure mode to a certain extent.

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“…The method mainly divides the volumetric strain of rocks into the elastic volumetric strain and volumetric strain of cracks. Under uniaxial compression, the volumetric strain of cracks, c v  , in the rock can be calculated thus [36,37]: Existing methods used for calculating characteristic stresses mainly include strain measurement, AC measurement, and an approach based on the volumetric strain of cracks. Among these, the one based on the volumetric strain of cracks has been widely used due to its definite concept and convenience of determination [34,35].…”

Section: Stress Analysismentioning

confidence: 99%

Section: Stress Analysismentioning

confidence: 99%

Fracture and Damage Characteristics of Granite under Uniaxial Disturbance Loads

Fei

Wang

et al. 2022

Buildings

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To investigate the mechanical properties and damage characteristics of granite under frequent disturbance loads in the process of underground engineering construction, laboratory uniaxial compression tests were conducted on granite under combined dynamic and static loading conditions. The following conclusions were reached: (1) under a dynamic disturbance, the failure stress of granite grows gradually as the initial stress and disturbance load rise due to the coupling of damage and strain-rate effect; (2) the characteristic stresses of granite specimens grow with the increasing amplitude of disturbance Δσ under the disturbing loads; with the same Δσ, the characteristic stresses show an increase trend with the increasing initial stress σm; (3) the particle size distribution of rock fragments broken under the disturbance load follows the fractal law, and the fractal dimension F gradually enlarges with the growth of Δσ, indicative of an increased degree of fragmentation; and (4) the damage variable grows rapidly at first, then steadily, and, finally, shows a rapid growth trend again under the disturbance loads. The Δσ significantly influences the number of cycles and rate of change of the damage variable during the steady increase. This research has certain theoretical significance and engineering guidance value for dynamic disaster recognition and control.

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The Influence of Joint Inclination and Opening Width on Fracture Characteristics of Granite under Triaxial Compression

Cited by 29 publications

References 29 publications

Research on Temporal and Spatial Distribution Characteristics of Microseismic Events of Slip-Type Rockburst

Research on Temporal and Spatial Distribution Characteristics of Microseismic Events of Slip-Type Rockburst

Study on the Failure Mechanism of Strain Rockburst

Fracture and Damage Characteristics of Granite under Uniaxial Disturbance Loads

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