Study on Failure Behaviors of Roofs with Varying Thicknesses in Longwall Coal Mining Working Face

Rock Mechanics and Rock Engineering, Journal Year: 2024, Volume and Issue: 57(8), P. 6259 - 6282

Published: April 2, 2024

Language: Английский

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Study on the linkage mechanism between key strata fracture in overburden and surface subsidence during caving mining in extra-thick coal seams

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Jan. 17, 2025

Caving mining in extra-thick coal seams induces large-scale overburden movement, leading to more intense fracture processes key strata, significant surface subsidence, and frequent dynamic disasters mines. This study, using the N34-2 caving face of 17th seam at Junde Mine as a case aims investigate time-varying linkage mechanism between microseismic characteristics, scales overburden's strata under such conditions. Based on Timoshenko's theory, bearing mode for is proposed, corresponding criteria are established. The modes step distances working were calculated theoretically verified localization data, showing that higher prone failure, increase distances. Numerical simulations monitoring techniques employed comprehensively analyze main controlling factors subsidence. To further clarify high-position full cycle divided into four sub-processes: short-term fracture, rapid compaction stability, energy accumulation. relationship subsidence responses analyzed each sub-process, establishing system. approach offers systematic accurate method predict assess movement processes, providing new insights prevention control rock burst seams.

Language: Английский

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Experimental analysis of key stratum stability and overburden settlement monitoring combined OFDR and mining-crack-evolution characteristics

Measurement, Journal Year: 2025, Volume and Issue: unknown, P. 117167 - 117167

Published: Feb. 1, 2025

Language: Английский

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Monitoring chloride ion concentration in saturated cohesive soils by optical fiber technology

Measurement, Journal Year: 2025, Volume and Issue: unknown, P. 117569 - 117569

Published: April 1, 2025

Language: Английский

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Dynamic Monitoring of Goaf Stress Field and Rock Deformation Driven by Optical Diber Sensing Technology

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(8), P. 4393 - 4393

Published: April 16, 2025

Addressing the critical technological needs for real-time monitoring of stress distribution in mining areas, a new method inverting goaf pressure using distributed optical fiber data is proposed. By coupling key stratum fracture mechanics model with subsidence trajectory function model, theoretical established to accurately describe spatial evolution during coal mining. The quantifies relationship between changes and failures through two-stage analysis process, based on distinct mechanical properties before after fracture. Physical experiments (3 m × 0.2 1.1 m) Brillouin Optical Time Domain Analysis (BOTDA) technology validated proposed method, comprehensive deformations. layer settlement dynamic transformation pre-fracture post-fracture stages realized, can be monitored predicted real time. results demonstrate consistency locations peak positions. High-precision sensing detected an ultimate strain threshold 4000 με failure, measurements consistently below this threshold. developed inversion formula successfully patterns within goaf, achieving capabilities. Compared BPPS measurements, deviation inverted less than 8.88%, root mean square error (RMSE) 0.98–1.20 different propulsion stages, coefficient determination (R2) 0.72 0.85. These findings provide crucial theory predicting implications improving safety systems optimizing operations.

Language: Английский

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The Application of Distributed Fiber-Optic Sensing Technology in Monitoring the Loose Zone in the Floor of Stoping Roadway

Rock Mechanics and Rock Engineering, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Language: Английский

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Review of Sensor-Based Subgrade Distress Identifications

Sensors, Journal Year: 2024, Volume and Issue: 24(9), P. 2825 - 2825

Published: April 29, 2024

The attributes of diversity and concealment pose formidable challenges in the accurate detection efficacious management distresses within subgrade structures. onset may precipitate structural degradation, thereby amplifying frequency traffic incidents instigating economic ramifications. Accurate timely is essential for maintaining repairing road sections with existing distresses. This helps to prolong service life infrastructure reduce financial burden. In recent years, advent numerous novel technologies methodologies has propelled significant advancements distress detection. Therefore, this review delineates a concentrated examination detection, methodically consolidating presenting various techniques while dissecting their respective merits constraints. By furnishing comprehensive guidance on facilitates expedient identification targeted treatment distresses, fortifying safety enhancing durability. pivotal role bolstering construction operational facets transportation underscored.

Language: Английский

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Experimental investigation on dynamic deformation characteristics of the overlying strata in backfilling strip mining at different time scales

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(25), P. 37283 - 37297

Published: May 21, 2024

Language: Английский

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Ground fissure development regularity and formation mechanism of shallow buried coal seam mining with Karst landform in Jiaozi coal mine: a case study

Journal of Mountain Science, Journal Year: 2023, Volume and Issue: 20(10), P. 3101 - 3120

Published: Oct. 1, 2023

Language: Английский

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Transseptal puncture using the Carto-Merge technique: a fluoroscopy-free and echocardiography-free method for real-time observation of needle position in the left atrium

International Journal of Clinical and Experimental Medicine, Journal Year: 2024, Volume and Issue: 17(7), P. 91 - 100

Published: Jan. 1, 2024

Language: Английский

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