Analytical study of subcritical crack growth under mode I loading to estimate the roof durability in underground excavation

Ji, Songtao; Wang, Zeng; Karlovšek, Jurij

doi:10.1016/j.ijmst.2021.08.006

Cited by 19 publications

(5 citation statements)

References 48 publications

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“…It is also situated in a typified arid and semi‐arid fragile ecological environment in China, making the harmonious development of high‐strength coal production and ecological preservation a crucial area of research. Given the unique challenges posed by the limited water resources and delicate ecological environment in the arid and semi‐arid regions of Yangjiacun Coal Mine, this study proposes the approach and foundational principles for implementing sustainable mining practices by examining the hydrogeological characteristics of the mining area and the various coal seam structures 23–25 …”

Section: Stability Analysismentioning

confidence: 99%

“…Given the unique challenges posed by the limited water resources and delicate ecological environment in the arid and semi-arid regions of Yangjiacun Coal Mine, this study proposes the approach and foundational principles for implementing sustainable mining practices by examining the hydrogeological characteristics of the mining area and the various coal seam structures. [23][24][25] 1. The implementation of backfilling mining can mitigate the impact of coal extraction on the surrounding environment by compensating for the void created by mining and limiting the movement damage to the overlying strata.…”

Section: Stability Analysismentioning

confidence: 99%

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Characteristics of overlying strata and mechanisms of arch beam failure in shallowly buried thick bedrock coal seams: A case study in western China

Wang,

Li,

Zhang

et al. 2023

Energy Science & Engineering

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The Yangjiacun coal mine, located in western China, exhibits distinctive characteristics, such as its shallow depth, thick bedrock, thin loose layer, and unique roof strata breaking movement. In this research, a comprehensive analysis of previous exploration data, subsequent mechanical testing, key stratum theory, natural equilibrium arch theory, and simulation tests and numerical simulations has been conducted to investigate the failure behavior of the overlying rock strata in the Yangjiacun Coal Mine. Specifically, the load‐bearing capacity of the key stratum structure in the bedrock and the morphological properties of the arch‐beam structure have been thoroughly examined. A mechanical model of the roof rock arch‐beam structure has been established, and an analytical formula for the limit size and stability criterion of the arch‐beam structure has been derived. The mining‐induced rock arch‐beam structure plays a crucial role in transferring the load of the upper strata to the surrounding goaf, thereby preventing subsidence and deformation of the overlying strata. However, the arch‐beam structure periodically experiences instability during the advancement of the working face, gradually progressing towards the upper layer until the main key stratum is breached and the arch‐beam structure collapses. Based on the characteristics of weathered rock and the arch‐beam failure model in the Yangjiacun Coal Mine, quantitative backfilling mining methods have been proposed to either compensate for the mining void created by coal extraction or limit the size of exposed key strata through strip mining, ensuring the stability of the R6 key stratum. This study represents a significant contribution to understanding the intricate failure behavior of overlying rock strata in coal mines and provides a valuable framework for the responsible and efficient extraction of coal resources in similar environments.

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Section: Stability Analysismentioning

confidence: 99%

Section: Stability Analysismentioning

confidence: 99%

Characteristics of overlying strata and mechanisms of arch beam failure in shallowly buried thick bedrock coal seams: A case study in western China

Wang,

Li,

Zhang

et al. 2023

Energy Science & Engineering

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“…Groundwater has a great influence on mechanical properties of soft rocks [6][7][8][9][10][11][12][13][14][15][16][17]. For example, Yao et al [6] carried out uniaxial compression and acoustic emission monitoring tests of coal with different water contents.…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior and Its Prediction of Saturated Weakly Cemented Medium-Grained Sandstone under Multiaxial Loadings

Zhao

Meng

et al. 2023

Geofluids

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Weakly cemented medium-grained sandstone in Ordos mining area of China is widely distributed under phreatic water. The creep behavior of saturated rock is important for the stability of water-resisting strata. In this paper, creep mechanical properties of saturated medium-grained sandstone were studied by triaxial rheological test. The results showed that medium-grained sandstone only shows attenuation creep and stable creep under low stress level, and accelerated creep occurs when axial load reaches about 75% of instantaneous compressive strength. The rock samples exhibit volume dilatancy under most loading levels and finally shear fracture. The failure mechanism is the dislocation separation of mineral particles. Based on the energy dissipation theory, the damage evolution equation was modified and introduced into the Burgers model, which can accurately describe the rheological behavior of saturated medium-grained sandstone. The modified model was used to predict the crack initiation time under different deviatoric stresses, which can provide guidance for early warning of water-resisting rock stability.

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“…Through coal seam stress measurement, anchoring force measurements, roof separation monitoring, microseismic monitoring, and other technologies, the distribution law of coal mine support pressure can be detected. Each technology has its own advantages and limitations in terms of accuracy, ease of use, and costs [19,26,27]. The coal seam stress measurement provides direct information regarding the stress state of the coal seam and surrounding strata, and it can be used to understand the overall distribution of the support pressure of the working face.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Empirical Study of Rockburst in the Adjacent Area of a Fully Mechanized Top-Coal Caving Face Based on Microseismic Technology

et al. 2023

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Monitoring and providing warnings for coal mine rockburst disasters is a worldwide problem. Several rockburst accidents have occurred in a 1301 belt transport chute near a 1300 fully mechanized caving mine face. To address this issue, an empirical study of the occurrence mechanism of rockbursts in the adjacent area of the fully mechanized top-coal caving face was carried out. This paper mainly addresses the following issues: (1) based on microseismic monitoring technology, the distribution characteristics of the host-rock-supported pressure of the 1300 working face were measured, and the evolution and distribution of the deep-well caving working face host-rock-supported pressure were analyzed. It is revealed that the occurrence mechanism of rockburst in the adjacent area is actually caused by the evolution and superposition of the lateral abutment pressure of the 1300 stope, and the stress of the original rock along the 1301 belt transport down chute; (2) a theoretical calculation model of dynamic and static abutment pressure in longwall stope is built, and an example is tested. The results show that the peak position of lateral abutment pressure of the coal body outside the 1300 goaf is around 63 m, and the peak value of abutment pressure is around 47 MPa; (3) coal body stress monitoring, bolt dynamometer detection, and other means are compared and analyzed. At the same time, with the help of CT geophysical prospecting and drilling cutting measurements, it is concluded that the 1301 belt transport down chute is in the bearing pressure influence zone (superimposed zone), which further verifies the validity of microseismic analysis results and the accuracy of the above theoretical model. Based on this, the early warning system and prevention measures for rockburst based on microseismic monitoring are proposed. The engineering practice shows that the dynamic and static bearing pressure distribution and evolution law of the working face can be dynamically obtained by using microseismic technology, which provides a basis for the accurate prediction and treatment of rockbursts.

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Analytical study of subcritical crack growth under mode I loading to estimate the roof durability in underground excavation

Cited by 19 publications

References 48 publications

Characteristics of overlying strata and mechanisms of arch beam failure in shallowly buried thick bedrock coal seams: A case study in western China

Characteristics of overlying strata and mechanisms of arch beam failure in shallowly buried thick bedrock coal seams: A case study in western China

Creep Behavior and Its Prediction of Saturated Weakly Cemented Medium-Grained Sandstone under Multiaxial Loadings

Mechanism and Empirical Study of Rockburst in the Adjacent Area of a Fully Mechanized Top-Coal Caving Face Based on Microseismic Technology

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