Application of Large-Scale Hydraulic Fracturing for Reducing Mining-Induced Stress and Microseismic Events: A Comprehensive Case Study

Kang, Huan; Jiang, Pengfei; Feng, Yanjun; Gao, Fuqiang; Zhang, Zhen; Liu, Xiaogang

doi:10.1007/s00603-022-03061-w

Cited by 19 publications

(5 citation statements)

References 41 publications

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“…As a result, it is necessary to control the break location of the main roof by artificial means so as to reduce the disadvantageous influence of the roof subsidence on the surrounding rocks of the PRR. Destress blasting and hydraulic fracturing can be used to weaken strong roofs to promote the caving of strong hard-to-cave roofs behind the longwall face [23][24][25][26]. However, blasting requires complex operations and strictly limited use of explosives [27,28].…”

Section: Hydraulic Fracturingmentioning

confidence: 99%

Weighting Failure Mechanisms of Pre-Driven Recovery Rooms and Evaluation of Hydraulic Fracturing Applications: A Case Study

Wang

Bai³

et al. 2023

Applied Sciences

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Roof weighting failures of pre-driven recovery rooms may cause huge economic losses and even casualties. The excessive dynamic load from the sliding of the broken main roof rock block causes the recovery room roof and inner supports to lose their support capacity during the last weighting. Discrete element software UDEC was used to investigate the surrounding rock deformation of the pre-driven recovery room with the main roof break at different positions. The results show that when the recovery room’s length from the main roof rock layer’s fracture region is short, the immediate roof is subjected to high deviatoric stress and the occurrence of horizontal stress concentration due to the deflection of the fractured rocks, and eventually the roof supports fail owing to the development of macroscopic shear crack zones. In this research, the hydraulic fracturing technique was applied to pretreat the main roof (fine-grained sandstone) of the 31108 panel at Huoluowan Coal Mine. Field observations suggest that the strength and duration of the periodic weighting after hydraulic fracturing treatment are both significantly reduced, effectively maintaining the bearing layer performance of the roof of the recovery room and coal pillar walls. The proposed fracturing design offers an effective method of ground control to the coal mines facing roof weighting failures of recovery rooms.

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Section: Hydraulic Fracturingmentioning

confidence: 99%

Weighting Failure Mechanisms of Pre-Driven Recovery Rooms and Evaluation of Hydraulic Fracturing Applications: A Case Study

Wang

Bai³

et al. 2023

Applied Sciences

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“…However, it is unsuitable to use a destress blasting method in highgassy mines, which may cause gas explosion accidents. Furthermore, large amounts of CO and other harmful gases resulting from blasting can be emitted into the working space, which is harmful to personal health (Huang et al, 2018;Kang et al, 2023). Additionally, the construction costs of deep borehole blasting are relatively higher.…”

Section: Introductionmentioning

confidence: 99%

Failure characteristics of thick hard roof stratum under hydraulic pre-splitting and its application in a coal mine, Dongsheng mining area

Zhu,

Li,

Teng

et al. 2024

Environ Earth Sci

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Due to the presence of the hard suspended roof, it cannot collapse naturally after being mined in a large-scale goaf. If the roof suddenly destroys without human intervention, it would cause serious disasters. In this paper, we discuss the mechanisms and applications of hydraulic fracturing in alleviating the potential for catastrophic disasters. After the fracturing crack propagation principle, we investigate the failure and stress characteristics of overburden with and without fracturing, taking a mine in Dongsheng mining area. The results show that the regulated roof suffers severe damage after fracturing, and the initial rupture distance of hard roof is reduced to 40 m or so. Additionally, the development height of water-conducting fissure zone is approximately 138.18 m. The fracturing effect can be preliminarily speculated according to fluid pressure curves. It is inferred that hydraulic fracturing point 3 has the best damage effect on the hard suspended roof. On the other hand, a common trait of overburden stress is easily observed by monitoring points, namely that the overburden stress after fracturing shows a relatively smaller value. The study provides theoretical support for the safety management of thick hard roofs, especially in the coal mines seriously affected by roof accidents.

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“…Real-time monitoring and analysis of these microseismic signals provide valuable information about underground structures and material distribution. This technology finds wide applications in various fields, including mining monitoring [1], geotechnical engineering [2], geological hazard prevention [3], and tectonic studies [4]. In recent years, significant advancements in microseismic technology research have primarily focused on seismic source localization techniques [5] and microseismic data processing [6,7].…”

Section: Introductionmentioning

confidence: 99%

Microseismic Data-Direct Velocity Modeling Method Based on a Modified Attention U-Net Architecture

Zhou,

Han,

Zhang

et al. 2023

Applied Sciences

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In microseismic monitoring, the reconstruction of a reliable velocity model is essential for precise seismic source localization and subsurface imaging. However, traditional methods for microseismic velocity inversion face challenges in terms of precision and computational efficiency. In this paper, we use deep learning (DL) algorithms to achieve precise and efficient real-time microseismic velocity modeling, which holds significant importance for ensuring engineering safety and preventing geological disasters in microseismic monitoring. Given that this task was approached as a non-linear regression problem, we adopted and modified the Attention U-Net network for inversion. Depending on the degree of coupling among microseismic events, we trained the network using both single-event and multi-event simulation records as feature datasets. This approach can achieve velocity modeling when dealing with inseparable microseismic records. Numerical tests demonstrate that the Attention U-Net can automatically uncover latent features and patterns between microseismic records and velocity models. It performs effectively in real time and achieves high precision in velocity modeling for Tilted Transverse Isotropy (TTI) velocity structures such as anticlines, synclines, and anomalous velocity models. Furthermore, it can provide reliable initial models for traditional methods.

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Application of Large-Scale Hydraulic Fracturing for Reducing Mining-Induced Stress and Microseismic Events: A Comprehensive Case Study

Cited by 19 publications

References 41 publications

Weighting Failure Mechanisms of Pre-Driven Recovery Rooms and Evaluation of Hydraulic Fracturing Applications: A Case Study

Weighting Failure Mechanisms of Pre-Driven Recovery Rooms and Evaluation of Hydraulic Fracturing Applications: A Case Study

Failure characteristics of thick hard roof stratum under hydraulic pre-splitting and its application in a coal mine, Dongsheng mining area

Microseismic Data-Direct Velocity Modeling Method Based on a Modified Attention U-Net Architecture

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