Progressive fracture processes around tunnel triggered by blast disturbances under biaxial compression with different lateral pressure coefficients

Long, Yi; Liu, Jianpo; Lei, Gang; Si, Ying-tao; Zhang, Chang-yin; Wei, Deng-cheng; Shi, Hong-xu

doi:10.1016/s1003-6326(20)65398-5

Cited by 26 publications

(4 citation statements)

References 31 publications

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“…Cement mortar has good uniformity and isotropy, and its strength can be adjusted according to the capacity of the loading equipment. It is often used as a material to simulate engineering rock masses [ 21 , 22 ]. In this research, cement mortar was taken as a model material to replace rock.…”

Section: Design Of Test Schemesmentioning

confidence: 99%

Spatio-temporal evolution of acoustic emission events and initiation of stress fields in the fracturing of rock mass around a roadway under cyclic high-stress loading

Lei,

Wu,

Zhu

2023

PLoS ONE

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To study fracture mechanisms and initiation of stress fields in the rock mass around a roadway subjected to cyclic stress, a series of loading and unloading tests were conducted on the rock mass around the roadway by using high-precision acoustic emission (AE) monitoring. The results show that intense AE activities occur in a specimen during cyclic load-holding at different levels. With the increase in the number of cycles, the overall stability of the specimen gradually decreases. In the cyclic loading and unloading process, the specimen exhibits a Kaiser effect. As the number of cycles increases, more AE events occur in the unloading stage and a Felicity effect is manifest. The spatial distribution of AE events is related to the stress regime and structure of the specimen, crack propagation in the roadway exhibits directionality due to effects of the principal stress. High stress is conducive to microcrack initiation and propagation in the specimen, which accelerates damage accumulation and macrofracture formation in a rock mass. The research provides a reference for roadway support work and disaster prevention and control in deep mines.

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Section: Design Of Test Schemesmentioning

confidence: 99%

Spatio-temporal evolution of acoustic emission events and initiation of stress fields in the fracturing of rock mass around a roadway under cyclic high-stress loading

Lei,

Wu,

Zhu

2023

PLoS ONE

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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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“…By PFC code, Wu et al [15] modeled the fracturing process of the samples with circular, horseshoe-shaped, trapezoidal, rectangular or square holes under biaxial compressive loads, and claimed that their fracture evolution is similar but with different initiation stress and crack strength under identical loading conditions, and the tensile cracks and remote cracks are restricted as the confining pressure rises, which were clearly explained according to the stress distributed near the cavities derived by an improved complex variable method. In addition, other loading methods such as general triaxial loading [16], true triaxial loading [17], Brazilian split tension [18], one-dimensional impact loading [5,19], one-dimensional static-dynamic loading [20][21][22], two-dimensional static and one-dimensional dynamic loading [23][24][25][26] and dynamic Brazilian split tension [27] were employed on samples with one circular, elliptical, horseshoe-shaped or rectangular hole to examine the fracturing behaviors and mechanical properties, providing some insights into the failure characteristics of underground openings under geo-stress.…”

Section: Introductionmentioning

confidence: 99%

Strength, Deformation and Fracture Properties of Hard Rocks Embedded with Tunnel-Shaped Openings Suffering from Dynamic Loads

Wu,

Jia

2024

Applied Sciences

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In rock engineering, the dynamic loads caused by mechanical action and rock blasting have an extremely significant influence on the stableness of surrounding rock masses. To examine the impact of dynamic load on the mechanical properties and fracturing characteristics of hard rocks as well as the failure responses of underground openings, a number of prismatic samples with holes of different numbers and configurations were prepared for dynamic tests employing an SHPB loading device. The experimental results demonstrate that the order of dynamic compressive strength of each group of samples under the impact nitrogen pressure of 0.45 MPa is: G3 > G2 > G5 > G4 > G7 > G6, and the dynamic deformation process of the samples is parted into three phases: linear elastic deformation, plastic deformation and post-peak deformation. A total of three categories of cracks, i.e., spalling cracks, shear cracks and tensile cracks, occur in the specimens. The failure mode of the samples having one or two holes arranged in a vertical direction is controlled by shear cracks, whilst that of the rest groups of pre-holed specimens belongs to tensile-shear failure. The existence of the fabricated holes in the samples significantly weakens the mechanical properties and affects the fracture evolution characteristics, which rely on the quantity and layout of the cavities in the specimens. The interesting results are also discussed and explained, and could supply some insight in the mechanisms of tunnel surrounding rock failure and rock dynamic hazards such as rock burst.

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Progressive fracture processes around tunnel triggered by blast disturbances under biaxial compression with different lateral pressure coefficients

Cited by 26 publications

References 31 publications

Spatio-temporal evolution of acoustic emission events and initiation of stress fields in the fracturing of rock mass around a roadway under cyclic high-stress loading

Spatio-temporal evolution of acoustic emission events and initiation of stress fields in the fracturing of rock mass around a roadway under cyclic high-stress loading

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

Strength, Deformation and Fracture Properties of Hard Rocks Embedded with Tunnel-Shaped Openings Suffering from Dynamic Loads

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