Experiments on rockburst proneness of pre-heated granite at different temperatures: Insights from energy storage, dissipation and surplus

Xu, Lei; Gong, Fei; Liu, Zhixiang

doi:10.1016/j.jrmge.2021.08.004

Cited by 53 publications

(11 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the theory of damage mechanics, the destruction of microstructure leads to the weakening of the macroscopic strength of the rock 77–79 . In this study, SEM technology was used to observe the microstructure of basalts after microwave irradiation.…”

Section: Discussionmentioning

confidence: 99%

Mixed‐mode I/II fracture properties and failure characteristics of microwave‐irradiated basalt: An experimental study

Yang

Yin

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

The notched semicircular bending samples with different microwave irradiations were subjected to 3-point bending fracture tests under mixed-mode I/II loading to investigate the effects of microwave irradiation on the fracture characteristics of basalt. Influences of the irradiation duration on the temperature, P-wave velocity, and mixed-mode I/II fracture characteristics under 2 kW power were studied. The acoustic emission device was utilized to monitor the acoustic emission signals during the destruction process. The P-wave velocity and equivalent fracture toughness are weakened by microwave irradiation, but the ductility of basalt is enhanced by microwave irradiation. The microscopic characteristics of the treated basalts were observed by scanning electron microscope. Microwave irradiation aggravated the creation and propagation of microcracks and pores. The study of the influence of microwave irradiation on mixed-mode I/II fracture characteristics of rock provides effective theoretical support for microwave-assisted rock fragmentation.

show abstract

Section: Discussionmentioning

confidence: 99%

Mixed‐mode I/II fracture properties and failure characteristics of microwave‐irradiated basalt: An experimental study

Yang

Yin

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Efforts have been undertaken to study the temperaturedependent mechanical properties of granite. The compressive strength of granite increased slightly within 300 °C [3,4]. This is due to the thermal expansion that reduced the distance between interfaces of rock mineral particles and enhanced the interaction and bonding between them [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Physical and Mechanical Properties of Beishan Granite after Cyclic Heating and Cooling with Water

Wang

Guo

Li³

et al. 2022

Lithosphere

View full text Add to dashboard Cite

Granite characterized by low permeability and high strength is commonly seen in underground construction. This paper is aiming at studying the influence of cyclic heating and water cooling on physicomechanical properties of Beishan granite, which is chosen as a potential host surrounding rock of a high level nuclear waste (HLW) repository. In this study, physical and mechanical properties of Beishan granite after repeated heating-cooling cycles are described. After five heating-cooling cycles with temperature up to 300°C, the diameter and length of specimens increase by 0.090% and 0.052%, respectively. And the mass of specimen reduces by 0.32 g. In the following conventional triaxial compression (CTC) tests, the peak strength shows a slightly increase, but the dilatancy threshold decreases. And both peak strain and dilatancy threshold strain exhibit increase, which is responsible for the decrease of Young’s modulus. During the test, acoustic emission (AE) is rarely monitored in the early loading and starts to generate systematically when the axial stress is beyond dilatancy threshold. On the other hand, in the hydraulic (HM) coupled experiments, both peak strength and dilatancy threshold show decrease. However, the ratio between dilatancy threshold and peak strength shows slightly increase. The same phenomenon can be observed for the peak strength and dilatancy threshold. The permeability shows rarely change compared with that of the specimen without experienced cyclic heating-cooling. AE is significantly monitored in the initial loading, which is seem more than that generated from dilatancy threshold to peak strength. The obtained results are useful for the construction of HLW repository.

show abstract

“…(Zhang et al, 2019a;2019b;2019c;Zhang et al, 2021) proposed a strain energy determination method for rocks under true triaxial compression (TTC), and investigated the energy evolution process and mechanism of different hard rocks under true triaxial compression (TTC) using strain energy analysis (Qu et al, 2022). In order to accurately and effectively predict the occurrence of rock bursts, a multi-indicator evaluation method for the occurrence of rock bursts at deep subsurface rock openings was established (Xu et al, 2022). explored the effects of temperature on energy storage and dissipation properties and rockburst susceptibility, revealing that high temperatures can damage the ESC of rocks, which is essential for reducing rockburst susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Characterization of true triaxial rock bursts in sandstones with different water contents

Chen¹,

Zhou²,

Pan³

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

The rockburst phenomenon occurs in dry red sandstone under high in situ stress, and the rockburst effect is weaker for a water-bearing rock. The rockburst effect on red sandstone with different water contents is analyzed in this paper. A true triaxial testing machine is used to conduct the loading, and acoustic emission recording equipment and a high-speed camera are used to monitor the acoustic signal inside the rock and the rock-caving situation throughout the entire process in order to analyze the characteristics of the acoustic emissions and the ejection form of the rockburst. The results show that rockburst occurs in dry red sandstone and 50% saturated red sandstone but not in saturated red sandstone. The phrase characteristics of the stress–strain curve of the dry rock vary more significantly than those of the water-bearing rock, and the elastic strain energy inside the rock decreases gradually as the water content increases. The double peak of the acoustic emissions curve occurs during the failure process of the dry rock and gradually transitions to a stepped pattern as the water content increases. The ejected fragments of dry red sandstone during the rockburst are abundant and large. The true triaxial test results illustrate the characteristic effect of the rockburst on red sandstone with different water contents, reveal the failure mode and ejection characteristics of red sandstone with different water contents, and demonstrate the influence of the water content on the rockburst characteristics of red sandstone. The results of this study provide a theoretical reference for the study of the rockburst mechanisms of similar hard rocks.

show abstract

Experiments on rockburst proneness of pre-heated granite at different temperatures: Insights from energy storage, dissipation and surplus

Cited by 53 publications

References 54 publications

Mixed‐mode I/II fracture properties and failure characteristics of microwave‐irradiated basalt: An experimental study

Mixed‐mode I/II fracture properties and failure characteristics of microwave‐irradiated basalt: An experimental study

Experimental Study on Physical and Mechanical Properties of Beishan Granite after Cyclic Heating and Cooling with Water

Characterization of true triaxial rock bursts in sandstones with different water contents

Contact Info

Product

Resources

About