Monitoring the Dynamic Response of the Overlying Rock–Soil Composite Structure to Underground Mining Using BOTDR and FBG Sensing Technologies

Wang, Zhenkang; Wang, Qiqing; Hu, Yanbo; Du, Jiafa

doi:10.1007/s00603-021-02530-y

Cited by 17 publications

(5 citation statements)

References 48 publications

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“…The schematic diagram is shown in Figure 7. During the drilling process (1), the flushing fluid flowed through the sedimentation tank (3) from the water source tank (5) and then entered the drilling hole. If the water level in the borehole kept at a constant value, only the flow rate of flushing fluid supplied to the borehole (i.e., the amount of flushing fluid leakage) needed to be measured to qualitatively determine the development of fractures in different rock layers.…”

Section: Test Methodsmentioning

confidence: 99%

“…At present, clean and green energy cannot fully meet human needs; thus, coal remains one of the main sources of energy supply [2,3]. However, underground coal mining leads to fractures in the overlying rock, especially under the mining conditions of an ultra-thick coal seam, where the roof moves in a large range and the fractures opening are large [4][5][6]. Once fractures extend to the surface aquifer, it leads to a decrease in the water level of the aquifer and the death of the surface vegetation (Figure 1), seriously affecting ecological sustainability.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Distribution of Overlying Rock Fractures Caused by Mining in Ultra-Thick Coal Seams and Its Impact on the Near-Surface Aquifer

Zhou,

2023

Sustainability

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Near-surface water is the foundation for maintaining the ecological environment, and coal remains an important energy source in today’s world as we face a shortage of green energy. Achieving near-surface-water protection while safely mining coal is an important way to ensure social and ecological health and sustainability. The key lies in whether the fracture height of the mining overlying strata affects the aquifer. This article compiles the coupling finite element and discrete element method (CFE-DEM) and established mechanical constitutive models such as the interaction between rock blocks on both sides of the penetrated fracture, rock mass fracture process, and the plastic deformation law of rocks based on the results of mining-induced overlying rock failure. On this basis, a numerical calculation model is established based on the engineering geological conditions of the Beixinyao Coal Mine. The numerical simulation results indicate that the theory and the CFE-DEM method can numerically simulate the distribution and evolution of mining-induced overlying rock fractures. The water-conducting fractures in the overlying strata of extra-thick coal seams extend to the front of the working face in a trapezoidal shape, and the angle formed between them and the advancing direction ranges from 62° to 75°. Combined with the in situ measurement results, the height of the water-conducting fracture zone of the extra-thick coal seam is between 209 m and 230 m; the fractures were not found to have affected the aquifer at a vertical distance of 252 m from the coal seam. This means that the impact of ultra-thick coal seam mining on the aquifer is very limited. The research is of great significance for ensuring coal mining and surface ecological sustainability in ultra-thick coal seam areas.

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Section: Test Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Distribution of Overlying Rock Fractures Caused by Mining in Ultra-Thick Coal Seams and Its Impact on the Near-Surface Aquifer

Zhou,

2023

Sustainability

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“…For example, the performance of equipment and the safety of miners can be monitored in real time [4][5][6][7][8]. IoT [2,[9][10][11] as elemental technologies, big data analytics [12], machine-tomachine (M2M) communication, artificial intelligence for data analysis [13][14][15], and heavy mining equipment.…”

Section: Development Of a Communication System For Underground Miningmentioning

confidence: 99%

Development of a Communication System for Underground Mining Informatization Leading to Smart Mining: A Comparison of Wi-Fi Ad Hoc and Wi-Fi Direct

IKEDA,

MALGAZHDAR,

SHIONOIRI

et al. 2022

Int.J.Soc.Mater.Eng.Resour.

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The enclosed space of an underground mining operation has issues, safety and productivity are concerns of utmost importance. As the danger increases as it goes deeper, there is a need for more technological innovation than now Smart mining is a general term for a new resource development technology that combines mining and ICT (Information and Communication Technology). As an example of smart mining, in this study, an in-situ stress monitoring system was developed, and demonstration test of the system in a mine was conducted. Wireless sensor networks (WSNs) have been proposed as a solution for environmental monitoring, worker position tracking, and additional functions. There are diff erent types of WSN systems including " Wi-Fi " technology. This research proposes a communication system using the " Wi-Fi Ad Hoc, Direct " mode, in which data loggers and mobile terminals (i.e., smartphones) transfer data to each another. Data are transmitted from a fixed underground base unit to a worker's mobile terminal. Next, these data transferred to a data logger in the surface once the worker leaves the mine. Hence, data wirelessly transmits between the surface and underground locations. Data communication range, transfer speed, and received signal strength indicator (RSSI) in diff erent conditions were measured to verify feasibility of the system.

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“…The law of mining surface damage is clarified on the basis of multisource fusion data [16,17]. The damage mechanism of overburden and surface is revealed by various means [18][19][20][21], and the prediction model of surface subsidence is built by combining various algorithms [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Difference in Surface Damage between Deep and Shallow Mining of Underground Coal Resources in China

Yan

Guo²,

Yan

2023

Sustainability

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The mining of underground coal resources often results in extensive damage to the ground surface, particularly in China, which has a large amount of coal resources. However, the laws of surface damage caused by the mining of deep and shallow underground coal resources are relatively different. This study analyzes the difference in surface damage induced by deep and shallow mining and its mechanism by field measurement and similar material simulation experiments. Surface damage is mainly manifested in the form of cracks, which can be categorized as permanent and dynamic cracks. Permanent cracks occur above the mining boundary of shallow and deep coal mines. Dynamic cracks (including dynamic stretching cracks and stepped cracks) only appear above the goaf in shallow mining. This disparity is due to the fact that strata movement in deep mining occurs in a “three zones” mode, with the failure height of strata increasing with the mining degree in an “S” shape. However, rock strata movement in shallow mining follows a “two zones” mode, with the failure height of rock strata increasing exponentially with the mining degree. Thus, the rock strata are prone to slide and become unstable in the form of benched rock beams, producing dynamic cracks, such as stepped cracks on the surface. This research improves the existing mining subsidence theory and provides technical support for relevant mines to take targeted treatment measures.

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Monitoring the Dynamic Response of the Overlying Rock–Soil Composite Structure to Underground Mining Using BOTDR and FBG Sensing Technologies

Cited by 17 publications

References 48 publications

Research on the Distribution of Overlying Rock Fractures Caused by Mining in Ultra-Thick Coal Seams and Its Impact on the Near-Surface Aquifer

Research on the Distribution of Overlying Rock Fractures Caused by Mining in Ultra-Thick Coal Seams and Its Impact on the Near-Surface Aquifer

Development of a Communication System for Underground Mining Informatization Leading to Smart Mining: A Comparison of Wi-Fi Ad Hoc and Wi-Fi Direct

Difference in Surface Damage between Deep and Shallow Mining of Underground Coal Resources in China

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