Limitations of Upper Protective Layers as Pressure Relief Measures for Extra-Thick Coal Seam Mining: Insights from a Case Study DOI Creative Commons
Yanjiang Chai, Linming Dou, Jiang He

et al.

Energies, Journal Year: 2024, Volume and Issue: 17(6), P. 1446 - 1446

Published: March 17, 2024

Upper protective layer (UPL) mining is extensively utilised as a pressure relief strategy to prevent outbursts and coal bursts. However, when the excavation height of protected substantial, depressurisation efficacy may be diminished. This paper takes Haishiwan mine in China case study explores stress evolution influencing factors extra-thick seam beneath through theoretical analysis, numerical simulation, field observation. The results indicate that increasing will lead upward development collapse zone overburden goaf, with “masonry beam” structure formed at higher position by key strata blocks. above masonry beam supported rock masse on both sides structure, leading increased near goaf eliminating effect layer. Numerical simulation shows such faults, layers, interlayer spacing, significantly affect distribution With increase spacing thickness extraction, reduction phenomenon UPL gradually decreases, especially an abnormal concentration gob-side seam. Observations Surface subsidence mining-induced seismic events corroborate conclusions analysis simulations. offer valuable guidance for seams selection UPL.

Language: Английский

Combined blasting for protection of gob-side roadway with thick and hard roof DOI Creative Commons
Qiang Fu, Jun Yang, Yubing Gao

et al.

Journal of Rock Mechanics and Geotechnical Engineering, Journal Year: 2024, Volume and Issue: 16(8), P. 3165 - 3180

Published: Feb. 7, 2024

The deformation control of surrounding rock in gob−side roadway with thick and hard roof poses a significant challenge to the safety efficiency coal mining. To address this issue, novel approach combining directional non-directional blasting techniques, known as combined blasting, was proposed. This study focuses on experimental investigation proposed method 122108 working face Caojiatan Coal Mine engineering background. initial phase involves physical model experiments reveal underlying mechanisms for protecting gob-side roof. results demonstrate that effectively accelerates collapse roofs, enhances fragmentation expansion coefficient gangue, facilitates filling goaf provides support overlying strata, thus reducing subsidence strata above goaf. Additionally, cutting main into shorter beams decrease stress disrupt transmission pathways. Subsequent numerical simulations were conducted corroborate findings experiments, validating accuracy results. Furthermore, field performed, affirming efficacy mitigating achieving desired protection roadway.

Language: Английский

Citations

18
Overlying strata failure mechanism and gas migration law in close distance outburst coal seams: A case study DOI
Yuqi Shang, Lin Zhang, Dezhong Kong

et al.

Engineering Failure Analysis, Journal Year: 2023, Volume and Issue: 148, P. 107214 - 107214

Published: March 21, 2023

Language: Английский

Citations

32
Characteristics of roof rock failure during coal seam mining and prediction techniques for mine water inflow in exposed karst areas DOI
Bo Li, Qiang Wu, Yang Yu

et al.

Bulletin of Engineering Geology and the Environment, Journal Year: 2024, Volume and Issue: 83(10)

Published: Sept. 9, 2024

Language: Английский

Citations

12
A Three-Dimensional Supporting Technology, Optimization and Inspiration from a Deep Coal Mine in China DOI
Feng Guo, Nong Zhang, Zhengzheng Xie

et al.

Rock Mechanics and Rock Engineering, Journal Year: 2023, Volume and Issue: 57(1), P. 655 - 677

Published: Oct. 13, 2023

Language: Английский

Citations

17
Experimental investigation of interfacial behavior of fiber optic cables embedded in frozen soil for in-situ deformation monitoring DOI
Bing Wu, Hong‐Hu Zhu, Tianxiang Liu

et al.

Measurement, Journal Year: 2023, Volume and Issue: 215, P. 112843 - 112843

Published: April 8, 2023

Language: Английский

Citations

13
Experimental Study on Water Reduction Modification and Efficient Utilization of Coal-Based Solid Waste Slurry DOI Creative Commons
C.W. Ma, Dayang Xuan, Jialin Xu

et al.

Advances in Civil Engineering, Journal Year: 2024, Volume and Issue: 2024, P. 1 - 8

Published: Jan. 29, 2024

Unreasonable treatment of coal-based solid waste and coal mining damage are important factors that cause negative environmental effects. Overburden isolated grouting, a green method, can realize emission reduction mine impairment mining. Fluidity economy indices to measure the performance slurry. Although fly ash slurry with high water‒cement ratio has good fluidity, it is wasteful in terms water resources, filling efficiency low, tectonic complexity affects its safe production; similarly, gangue powder fluidity but comes cost complex implementation. Here, relationship between slurries was studied experimentally; effects particle size dosage polycarboxylic acid reducer on consumption preparation were analyzed. Our results show fluidities increased increasing ratios under laboratory conditions; much higher than same conditions. When 50% sizes 40‒45, 50‒55, 60‒70, 70‒80 mesh added make composite slurries, rate 20%, 31%, 34%, 36%, respectively. Adding 1% top effect gave comprehensive rates 29%, 44%, 49%, 53%, The critical achieve stable suspension 0.27‒0.33 mm; when this exceeded, precipitation speed accelerated, reduced. A flocculation structure exists breakdown structure, increase proportion free water, improve resultant This high-efficiency utilization method modified by safety grout-filling technology.

Language: Английский

Citations

4
Research on a Space–Time Continuous Sensing System for Overburden Deformation and Failure during Coal Mining DOI Creative Commons
Gang Cheng,

Zhenxue Wang,

Bin Shi

et al.

Sensors, Journal Year: 2023, Volume and Issue: 23(13), P. 5947 - 5947

Published: June 27, 2023

Underground coal mining can cause the deformation, failure, and collapse of overlying rock mass a seam. If design, monitoring, early warning, or emergency disposal are improper, in that case, it often lead to disasters such as roof falls, water inrush, surface collapse, ground fissures, seriously threatening safety mine engineering geological environment protection areas. To ensure intrinsic security entire process, aspace–time continuous sensing system overburden deformation failure was developed, which breaks through limitations traditional monitoring methods characterize evolution process subsidence. This paper summarizes classification typical modes. It researches space–time rock–soil above seam based on Distributed Fiber Optic Sensing (DFOS). A multi-range strain optical fiber neural series from micron meter developed achieve synchronous separation, internal micro–cracks, large deformation. The cable–rock coupling test verified reliability data. network constructed using integrated layout technology underground. Different nerves’ performance application effects were compared analyzed with field examples. physical model used carry out experimental study subsidence prediction during mining. results showed data reliable could be predict calculation for evaluation. systematic review shortcomings current observation conducted, proposed. sensing, transmission, processing, decision-making, response. Based fusion multi-parameter multi-method multi-algorithm multi-threshold realized real-time acquisition information seams. utilizes long-term historical research area modeling, realizing evaluation well potential work provides theoretical reference prevention control environmental carrying capacity development.

Language: Английский

Citations

10
Analysis of Intelligent Mining Pressure Monitoring and Surface Displacement Intelligent Methods Based on Machine Learning Algorithms DOI

Qiming Wei,

Ya-Jun Hu,

Hu Wang

et al.

Sustainable civil infrastructures, Journal Year: 2025, Volume and Issue: unknown, P. 123 - 133

Published: Jan. 1, 2025

Language: Английский

Citations

0
Geophysics-informed stratigraphic modeling using spatial sequential Bayesian updating algorithm DOI Creative Commons

Wei Qi Yan,

Shouyong Yi,

Taiyi Huang

et al.

Journal of Rock Mechanics and Geotechnical Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

Citations

0
Study on Overlying Strata Movement and Stress Distribution of Coal Mining Face with Unequal Thickness Bedrock DOI Open Access

Chuanwei Zang,

Feng Bai,

Miao Chen

et al.

Processes, Journal Year: 2025, Volume and Issue: 13(3), P. 752 - 752

Published: March 5, 2025

The variation in roof structure induced by changes bedrock thickness exerts a direct influence on the stress distribution within lower strata, consequently governing stability of roadway surrounding rock. To investigate impact variations overburden fracture behavior and evolution deep-buried thick loose layers, numerical simulation model an unequal-thickness working face was developed using discrete element software. This utilized to conduct systematic investigation into characteristics overburden, displacement characteristics, during mining process. results demonstrate that as advances progressively increases, several significant occur: caving interval immediate extends; degree fragmentation, overall separation, subsidence rock layer above goaf gradually diminish; peak at shifts deeper coal wall; zone expands. Through establishment mechanical key formula for derived, elucidating mechanics with varying thicknesses. A combined support measure tailored thicknesses has been developed. Practical applications have demonstrated technology’s effectiveness maintaining stability, offering valuable guidance safe efficient operations under comparable geological conditions.

Language: Английский

Citations

0