Cross-borehole hydraulic slotting technique for preventing and controlling coal and gas outbursts during coal roadway excavation

Lin, Baiquan; Yan, Fazhi; Zhu, Chuanjie; Zhou, Yan; Zou, Quanle; Guo, Chunhui; Liu, Ting

doi:10.1016/j.jngse.2015.06.035

Cited by 141 publications

(81 citation statements)

References 37 publications

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“…For the medium risk in outburst, the strict gas monitoring and the high level of mine ventilation management are very necessary. For the high risk or the extreme risk in outburst, simply improving mine ventilation and strengthening gas monitoring are not enough, P1 P2 P3 P4 P5 P6 P7 P8 P9 outburst index Working face 1122 2 3 1 2 3 2 2 1 1 63.472 Working face 1112 1 2 2 2 3 2 2 1 2 62.881 Working face 1222 1 2 3 3 3 2 2 1 2 more complicated measures such as gas drainage [67][68][69], hydraulic slotting [70,71], mining protective seam [72,73], etc. should be should be taken to prevent outburst accidents.…”

Section: S Case Studies and Discussionmentioning

confidence: 99%

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

Zhou

Herrera

Hidalgo

2017

International Journal of Mining, Reclamation and Environment

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ABSTRAeTIn this study, a new approach is proposed and developed for evaluating the comprehensive outburst index (range between Oand 100), which is a quantitative assessment approach and will enable us to better understand the risk degree of coal and gas outburst in coal mines. By selecting some typical risk-free and high-risk outburst mines from China as the evaluation targets, we assessed their comprehensive outburst indexes with the developed approach. The assessment results are fully consistent with the actual situations, which indicates that our new developed approach is reliable and can be recommended for applying in more coal mines.

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Section: S Case Studies and Discussionmentioning

confidence: 99%

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

Zhou

Herrera

Hidalgo

2017

International Journal of Mining, Reclamation and Environment

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“…Further, because of its proven ability to grind, penetrate, and erode effectively, abrasive water jet slotting parallel to the borehole axis has been applied in the Pingdingshan mining area in Henan province. As shown in Figure 5, results indicate that the amount of gas extracted from a single borehole can be increased by a factor of four or five by slotting [30].…”

Section: Technology and Its Applicationmentioning

confidence: 93%

“…parallel to the borehole axis has been applied in the Pingdingshan mining area in Henan province. As shown in Figure 5, results indicate that the amount of gas extracted from a single borehole can be increased by a factor of four or five by slotting [30]. parallel to the borehole axis has been applied in the Pingdingshan mining area in Henan province.…”

Section: Technology and Its Applicationmentioning

confidence: 99%

Research on Hydraulic Technology for Seam Permeability Enhancement in Underground Coal Mines in China

Cheng

Xia

et al. 2018

Energies

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Abstract:Coalbed methane (gas) is a high quality and clean resource, but it also causes disasters in coal mines in China. The low permeability of coal seams is the main reason that developing coalbed methane (CBM) as an energy resource is difficult, so increasing coal seam permeability is the key to CBM development in China. In this paper, the principal techniques for seam permeability enhancement are presented. The paper focuses on hydraulic technology for seam permeability enhancement (HTSPE), which is considered an economic and highly efficient technology for seam permeability enhancement. The process of HTSPE development is reviewed and the current status of the theories behind HTSPE and the technology and equipment for its use are summarized. The goal is to identify the gaps in HTSPE research and the problems in its implementation. In the future, integration and diversification of the technologies along with on-board intelligence and miniaturization may be the trends for the equipment. Finally, it is shown that tree-shaped borehole fracturing can be used to develop CBM in underground coal mines. This study could be used as a valuable example for other coal deposits being mined under similar geological conditions.

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“…Many researchers suggested using gas pressure, coal bed stresses, and methane concentration parameters based on these characteristic pieces of information to predict CGOB disasters. The main contactless monitoring and early warning methods to predict the CGOB disasters include electromagnetic radiation (EMR) method [15][16][17][18], acoustic emission (AE) method [19,20], and microseismic (MS) method [21]. Compared with AE and EMR, MS inversion technology exhibits advantages in source inversions, monitoring range, and signal connotation aspects over a large size monitoring range [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Relationship between MS Frequency Response and Coal and Gas Outburst

Zhu

Li²,

Feng

et al. 2018

Shock and Vibration

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Microseismic (MS) frequency response is an important part of high-efficiency data mining to achieve the aim of coal and gas outburst (CGOB) early warning. Based on the variation pattern of acoustic emission (AE) signal in the coal failure process, the experimental characteristics of MS activity and typical signals CGOB were obtained in this study. First, the AE behavior of coal failure experiment was studied, and an explanation of laws was provided as follows: the fracture behavior of coal sample exhibits certain characteristics of AE response in terms of AE event count, signal amplitude, and frequency; each stage has its own physical meaning during the process of loading test. Based on these laws, CGOB experiments were carried out using a large CGOB physical simulation system with a MS monitoring system. Notching filter and wavelet packet transform technique were used in the denoising and feature extraction of six typical MS events (signals). The features of each stage, including the time-frequency domain, were extracted and quantitatively expressed. We finally arrive at the following conclusions: (1) CGOB exhibits significantly periodic characteristics, and each CGOB stage corresponds to the significant response characteristics of MS. CGOB presents varying characteristics, such as "valley-peaks-valley". (2) From the incubation stage to happen stage of outburst, the spectrum significantly moved from extremely low frequency (100-200 Hz) to high-frequency band (approach to 1600 Hz). During the residual stage, MS frequency manifested the concentration distribution (50 Hz) and offered the advantage of energy concentration. (3) The phenomenon of signal energy also shows the trend of energy transform low to high and to low modes along with the process. Signals total energy distribution (42.81%, 1,437.5-1,812.5 Hz) in the happen stage are markedly larger than those of events in incubation stage (7.01%) and residual stage (1.44%). The methodology presented in this paper for CGOB signal analysis provides a new method to obtain MS response precursor and predict CGOB disaster. This approach can be useful for rockburst anticipation and control during mining in gas and highly stressed coal mines.

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Cross-borehole hydraulic slotting technique for preventing and controlling coal and gas outbursts during coal roadway excavation

Cited by 141 publications

References 37 publications

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

Research on Hydraulic Technology for Seam Permeability Enhancement in Underground Coal Mines in China

An Experimental Investigation on the Relationship between MS Frequency Response and Coal and Gas Outburst

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