Measures to deal roof-shock during tunneling at deep and extra-thick coal

Liu, Jinxiao; Liu, Yongle; Li, Wenxin; Zhuang, Xinguo; Xin, Chengrui

doi:10.1007/s12517-019-4340-1

Cited by 7 publications

(5 citation statements)

References 17 publications

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“…In addition, the mining of extra-thick coal seams has gradually shifted to deep formations, and the mining technology has become more mature. [19][20][21] During the working face life cycle, it is indispensable to safely and efficiently mine extra-thick coal seams while stopping and withdrawing the supports at a suitable location is the most crucial step to end the cycle. [22][23][24] The stopping mining line of the working face is also called the terminal mining line, which is the position where the longwall working face stops coal mining and withdraws the supports.…”

Section: Introductionmentioning

confidence: 99%

“…For the study of the roof of the extra‐thick coal seam, Li et al 16 elucidated the evolution regularity of the mining stress in the extra‐thick coal seam under the hard‐top condition; Zhu et al 17 proposed using the overburden caving model to predict multi‐layer hard roof based on key stratum theory; He et al 18 artificially cracked the hard roof using fracturing technology. In addition, the mining of extra‐thick coal seams has gradually shifted to deep formations, and the mining technology has become more mature 19–21 …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reasonable stopping method and retracement channel support at fully mechanized top coal caving working face of 15 m extra‐thick coal seam: A case study

Xie

et al. 2022

Energy Science & Engineering

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Extra-thick coal seams are widely distributed in the Datong mine area in China. The rapid stopping of mining and the support withdrawal technology for extra-thick coal seams need to be developed urgently. The reasonable stopping top coal caving distance, main roof's fracture line position, and large section roadway during the stopping period (LSRSP) support method of the header face of 15 m extra-thick coal seam are systematically studied by using field measurement, experiment, numerical simulation, and similar material simulation methods. With the increase in stopping coal caving distance, the range of the medium and low displacement zone of the LSRSP overburden gradually expands. In contrast, the depth of the plastic zone decreases. The scope and intensity of the high-stress area of the overlying rock in front gradually decrease and shift from deep to the outside, while the peak stress area shifts from the top coal area to the coal rib of the retracement channel.Comparing the stopping of medium-thick and thick coal seam working face, the interaction between "main roof−unmined top coal−supports" is analyzed.The unique characteristics of the extra-thick coal seam working face are derived: when the stopping coal caving distance is shorter than the length of the key block, the dropped coal body cannot effectively restrict the movement of key blocks. Mutual compression and subsidence occur between key blocks, making the broken coal rock block squeeze into the supports. By the simulation study of each index, the stopping coal caving distance of the extrathick coal seam is optimal when it is slightly larger than the length of the key block (i.e., the periodic weighting step), simultaneously, the main roof fracture line behind the supports is most favorable for stopping mining. After ensuring the stability of the LSRSP's overburden structure, the differentiated support scheme of "controlled zoning−strength grading" was proposed, and the

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reasonable stopping method and retracement channel support at fully mechanized top coal caving working face of 15 m extra‐thick coal seam: A case study

Xie

et al. 2022

Energy Science & Engineering

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“…At present, the rock burst prevention and control measures [7][8][9][10][11][12][13][14][15][16][17] at home and abroad, which can be classified into two categories, namely, regional prevention measures and local risk relief measures, mainly include blasting destressing, stress relief slot destressing, and borehole destressing. Reasonable application of these measures can effectively decrease the impact magnitude and the number of rock burst disasters.…”

Section: Introductionmentioning

confidence: 99%

Study on the “Pressure Relief and Yielding Support” Joint Prevention and Control Technology for the Weak Impact Roadway in the Extremely Thick Coal Seam

Yin

Liu

Sun

et al. 2021

Advances in Civil Engineering

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Weak impact occurs during roadway excavation in some extremely thick coal seams in China. Although this hazard is not enough to destroy the roadway, it will cause fracturing and large deformation of the roadway surrounding rock, resulting in the fracturing of bolts and anchor cables and bringing great difficulties to roadway support. In the hope of solving this problem, firstly, the reason for impact occurrence in the roadway of the extremely thick coal seam is analyzed from the perspective of energy. Then, the surrounding rock fracture evolution in such a roadway is explored by means of numerical simulation, microseism, and borehole observation. Furthermore, the “pressure relief and yielding support” joint prevention and control technology is proposed and applied to Yili No. 1 Coal Mine. The field engineering application results show that the joint prevention and control technology can effectively reduce the impact energy and ensure the stability of the roadway surrounding rock in the extremely thick coal seam. The research findings can provide a theoretical foundation for the roadway support of the same type.

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“…Zhang [19] established the mechanical structure model of the surrounding rock of the deep three soft coal seam roadway, revealed the deformation mechanism of the roadway roof and proposed the principles for the SRDC of this asymmetrical roadway in deep TCS. Liu [20] studied the roof impact damage characteristics in the process of driving deep full coal roadway in Northwest coal field, obtained the induced factors of roof impact, creatively proposed and successfully applied the four-step scheme of roof impact prevention and control of deep full coal roadway. In view of the control problem of the surrounding rock of the large section chamber under the 1200 m deep goaf, Xie [21] proposed a comprehensive control technology using the strong anchor bolt (cable) support, the pouring of a thick reinforced concrete wall, and a full section pressure-regulating grouting behind the wall.…”

Section: Introductionmentioning

confidence: 99%

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

et al. 2020

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High-efficiency maintenance and control of the deep coal roadway roof stability is a reliable guarantee for safe production and sustainable development of a coal mine. With belt haulage roadway 3108 in MenKeqing coal mine as the research background, in situ investigation, theoretical analysis, numerical simulation, and engineering practice were carried out to reveal the law of improving the bearing state of bolts by increasing the thickness of the roof anchoring layer. Also, the mechanism of the high-efficiency and long anchoring of the roof is revealed. Results show that increasing thickness of the roof anchorage layer could mobilize deep rock mass to participate in the bearing and promote the bolt to increase the resistance in a timely manner to limit the deformation of rock mass. Through the close link between shallow soft rock mass and deep stable rock mass, the deformation of the shallow rock mass is well controlled and so are the development and expansion of the roof separated fissures from shallow to deep. Long high-performance sustainable bolt technology for roof are proposed and carried out to control the stability of the deep roadway roof. Engineering practice indicates that deformations of roof could be efficiently controlled. The maximum deformations of the roof and sidewall-to-sidewall are 17 mm and 24 mm, respectively. No obvious separation fissures are found in the anchoring range of roof. This study provides a reference for roof stability control of deep roadway under similar conditions.

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Measures to deal roof-shock during tunneling at deep and extra-thick coal

Cited by 7 publications

References 17 publications

Reasonable stopping method and retracement channel support at fully mechanized top coal caving working face of 15 m extra‐thick coal seam: A case study

Reasonable stopping method and retracement channel support at fully mechanized top coal caving working face of 15 m extra‐thick coal seam: A case study

Study on the “Pressure Relief and Yielding Support” Joint Prevention and Control Technology for the Weak Impact Roadway in the Extremely Thick Coal Seam

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

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