Influence of temperature on acoustic emission source location accuracy in underground structure

Dong, Longjun; Tao, Qing Lin; Hu, Qing-chun

doi:10.1016/s1003-6326(21)65667-4

Cited by 14 publications

(7 citation statements)

References 31 publications

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“…in addition, the acoustic emission monitoring system is also an important method for monitoring rock movement and deformation. Moreover, it can be used to characterize the failure process of rock failure [49][50][51][52]. ultrasonic testing technology has been widely recognized in the field of geotechnical engineering.…”

Section: Basis For Determination Of Rock Instabilitymentioning

confidence: 99%

Mechanical Properties and Energy of Sandstone Under Cyclic Loading in Evolutionary Pattern Experimental Studies

2023

Archives of Mining Sciences

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Mechanical ProPerties and energy of sandstone Under cyclic loadingin evolUtionary Pattern exPeriMental stUdies in order to explore the mining failure law of deep coal seam floor and clarify the mechanical behavior and energy change in the floor strata during mining, the mechanical properties and energy evolution law of sandstone under cyclic loading with different confining pressures (20, 30, 40 MPa) were studied using the Rock Top multi-field coupling tester. The results are as follows: (1) the hysteresis phenomenon of a rock stress-strain curve under cyclic loading is evident. Moreover, the hysteresis loop migrates to the direction of strain increase, and the fatigue damage caused by cyclic loading has a certain weakening effect on the peak strength of rock; (2) both the number of cycles and the axial strain show a nonlinear change characteristic that satisfies the quadratic function relationship. Among them, the stress level of the rock is the main factor affecting the fitting effect; (3) under the same confining pressure, with an increase in cycle level, the macroscopic deformation of the rock increases, the accumulation of fatigue damage in the sample increases, and the irreversible deformation of the rock increases, which leads to an increase in energy input and dissipation; (4) in terms of elastic energy and dissipation energy, elastic energy plays a dominant role. in the initial cycle, the rock is destroyed, and the rock energy loss is great. After the second cycle, the input energy is mainly stored in the rock in the form of elastic energy, and only a small part of the input energy is released in the form of dissipation energy; (5) the confining pressure can improve the efficiency of rock absorption and energy storage, enhance the energy storage limit of rock, and limit the dissipation and release of partial energy of rock. The greater the confining pressure, the more evident the limiting effect, and the more significant the dominant position of elastic energy; and (6) the change in the energy dissipation ratio can be divided into three stages: rapid decline stage, stable development stage and rapid rise stage. The greater the increase in dissipation energy, the greater the degree of rock damage. The evolution process of the energy dissipation ratio can reflect the internal damage accumulation process of rock well, which can be used as the criterion of rock instability.

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Section: Basis For Determination Of Rock Instabilitymentioning

confidence: 99%

Mechanical Properties and Energy of Sandstone Under Cyclic Loading in Evolutionary Pattern Experimental Studies

2023

Archives of Mining Sciences

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“…Existing studies have shown that it is feasible to use the Internet of things and cloud computing to establish a production early warning system for real-time monitoring, which also provides a technical guarantee for the feasibility of ISE to guide engineering practice [64]. Moreover, in the process of mine production, by using the current advanced positioning method (such as complex structure positioning [65][66][67][68]) to quickly determine the location of rock failure, it is also possible to determine the potential risk location in time according to different environments [69][70][71], thus realizing the purpose of early warning [72,73].…”

Section: Practical Application Functions Of Isementioning

confidence: 99%

Intelligent Safety Ergonomics: A Cleaner Research Direction for Ergonomics in the Era of Big Data

Dong

Wang

2022

IJERPH

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Safety ergonomics is an important branch of safety science and environmental engineering. As humans enter the era of big data, the development of information technology has brought new opportunities and challenges to the innovation, transformation, and upgrading of safety ergonomics, as the traditional safety ergonomics theory has gradually failed to adapt to the need for safe and clean production. Intelligent safety ergonomics (ISE) is regarded as a new direction for the development of safety ergonomics in the era of big data. Unfortunately, since ISE is an emerging concept, there is no research to clarify its basic problems, which leads to a lack of theoretical guidance for the research and practice of ISE. In order to solve the shortcomings of traditional safety ergonomics theories and methods, first of all, this paper answers the basic questions of ISE, including the basic concepts, characteristics, attributes, contents, and research objects. Then, practical application functions of ISE are systematically clarified. Finally, following the life cycle of the design, implementation, operation, and maintenance of the system, it ends with a discussion of the challenges and application prospects of ISE. The conclusion shows that ISE is a cleaner research direction for ergonomics in the era of big data, that it can deepen the understanding of humans, machines, and environment systems, and it can provide a new method for further research on safety and cleaner production. Overall, this paper not only helps safety researchers and practitioners to correctly understand the concept of intelligent safety ergonomics, but it will certainly inject energy and vitality into the development of safety ergonomics and cleaner production.

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“…Acoustic emission (AE) method has been widely used in rock damage fracture and damage localization detection [26,27]. Zhang et al conducted the uniaxial multistage loading test on the siltstone, and found that the AE parameters depict the changes in the activity of cracks during rock fracture from temporal perspectives [26].…”

Section: Introductionmentioning

confidence: 99%

The Deformation Behavior and Failure Modes of Surrounding Rock after Excavation: A Experimental Study

Liang

Hao-yong²,

et al. 2023

Shock and Vibration

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The deformation and failure of the surrounding rock during roadway excavation often determine the choice of supporting methods. To study the deformation behavior and failure modes of the surrounding rock after excavation under unloading stress, structural model tests were carried out with a novel experimental device. The present structural model test using partial hollow thick-walled cylinder cement mortar specimen φ200 mm × 280 mm with a horizontal central circular hole of 60 mm diameter and the hollow height of 160 mm was conducted to investigate the deformation, failure characteristics, and AE response of a whole testing process from excavation to postunloading state. Experimental results revealed that the amount of deformation behind the surface is significantly higher than that in front of the surface, and the radial strain increases with the increase of the distance from the surface within the range affected by unloading. Furthermore, the unloading rate has a little effect on the radial deformation of the surrounding rock in front of the surface, but has a substantial effect on the radial deformation behind the excavation surface. The peak value of the strain rate at the unloading rate of 2 MPa/s is much higher than that at the unloading rate of 0.1 MPa/s. According to AE results and the failure of opening the boundary, the increase of unloading rate triggers and exacerbates the damage of the specimen under high in situ stress conditions. The surrounding rock expanded to the inner hollow, accompanied by large dilation and volume changes, and it resulted in the shrinkage of the hole diameter. A large number of rock slices are generated at the opening curved free surface and then fell off, whose morphology is similar to the rock blocks that fell off after caving failure and rock burst in situ field. The results show that the system can accurately simulate the mechanical response and acoustic emission response of the excavated surrounding rock, which provides a new experimental method for further study of the unloading response of the surrounding rock.

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Influence of temperature on acoustic emission source location accuracy in underground structure

Cited by 14 publications

References 31 publications

Mechanical Properties and Energy of Sandstone Under Cyclic Loading in Evolutionary Pattern Experimental Studies

Mechanical Properties and Energy of Sandstone Under Cyclic Loading in Evolutionary Pattern Experimental Studies

Intelligent Safety Ergonomics: A Cleaner Research Direction for Ergonomics in the Era of Big Data

The Deformation Behavior and Failure Modes of Surrounding Rock after Excavation: A Experimental Study

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