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The Roof Breaking Characteristics and Overlying Strata Migration Law in Close Seams Group Under Repeated Mining

  • Shangshang Zheng
  • Yahui Lou
  • Dezhong KongEmail author
  • Guiyi Wu
  • Yong Liu
Original Paper
  • 14 Downloads

Abstract

In view of the fact that the roof breaking characteristics and overlying strata migration law of close coal seams under repeated mining conditions are not clear, which seriously affects the safety advancing of working face. A large-cutting-height panel in Panjiang of Guizhou Province is used as an example, the roof breaking characteristics and overlying strata migration law under repeated mining are studied using theoretical analysis, numerical simulation and field observation. The research results show that although the roof weighting is not strong in close coal seams mining, there are three kinds of roof weighting phenomena frequently in different overlying strata stratum and the coal face is easy to failure due to the repeated mining; the theoretical formula (5) for determining the support resistance is obtained by establishing the mechanical model and the calculated support resistance of 7200 kN can be determined; compared with the single coal seam mining, the initial weighting interval is smaller and the periodic weighting interval will not change much under the repeated mining; after theoretical analysis and numerical simulation, it can be known that it is necessary to strengthen the control of coal face stability and prevent safety accidents caused by coal face rib spalling in close seams group under repeated mining. The research results provide a theoretical basis for coal seam mining under similar conditions.

Keywords

Close coal seams Roof breaking characteristics Overlying strata migration law Repeated mining 

Notes

Acknowledgements

We acknowledge the financial support from the Scientific Research Foundation of Guizhou Provincial Department of Science and Technology and Guizhou University (QianKehe LH [2017]7280) and the annual academic training and special innovation program of Guizhou University in 2017 (Guizhou Kehe [2017]5788) and The Youth Science and Technology Talents Development Project of Guizhou Education Department (Guizhou Education Cooperation KY character [2018] 114) and the funding from the Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education (JYBSYS2017101) and The first class professional “mining project” in Guizhou province (SJZY2017006).

References

  1. Bandis S, Lumsden AC, Barton NK (1981) Experimental studies of scale effects on the hear behavior of rock joint. Int J Rock Mech Min Sci Geomech Abstra 306–312Google Scholar
  2. Barton N, Bandis S (1990) Review of predictive capabilities of JRC–JCS mode in engineering practice [A]. In: Rock Joints [C]. A. A. Balkema, Rotterdam, pp 603–610Google Scholar
  3. Chang J-C, Xie G-X, Zhang X (2015) Analysis of coal face slab mechanism in large mining height fully mechanized caving face in extra-thick coal seam. Rock Soil Mech 36(3):803–808Google Scholar
  4. Cheng ZH, Qi Q-X, Li H-Y et al (2016) Experimental study on dynamic evolution characteristics of mining stress-fracture in superimposed coal seam group. J Coal 41(2):367–375Google Scholar
  5. Goodman RE (1980) Introduction to rock mechanicals. Wiley, New YorkGoogle Scholar
  6. He M-C, Xie H-P, Peng S-P et al (2005) Research on rock mechanics in deep mining. Rock Mech Eng 24(16):2803–2813Google Scholar
  7. Hu SX, Xu X-L, Tian S-C et al (2016) Optimization of roadway location in lower coal seam from synergy mechanism of contiguous seam mining. J Min Saf Eng 33(06):1008–1013Google Scholar
  8. Hua XZ, Xie GX (2008) Coal face mechanism and control technology for large mining height fully mechanized working face. Coal Sci Technol 36(9):1–5Google Scholar
  9. Huang H-F, Yan Z-G, Yao B-H et al (2012) Study on the development law of overlying rock fissures in coal seam group in Wanli mining area. J Min Saf Eng 29(5):619–624Google Scholar
  10. Itasca (2009) UDEC2D-Universal Distinct Element Code. 4.0 ed. Minneapolis, ItascaGoogle Scholar
  11. Li JG, Tian DZ, Yang S-S (2004) Research on the influence mechanism of the mining face of the fully mechanized top coal caving face on the coal face piece. J Taiyuan Univ Technol 35(4):407–409Google Scholar
  12. Li S-G, Ding Y, An C-F et al (2016) Experimental research on the shape and dynamic evolution of repeated mining-induced fractures in short-distance coal seams. J Min Saf Eng 33(5):904–910Google Scholar
  13. Ning Y (2009) Roof mining mechanism and control technology of large mining height fully mechanized coal wall. J Coal 34(1):50–52Google Scholar
  14. Wang J-C (2007a) Extremely soft and thick coal seam coal face slab and prevention mechanism. J Coal 32(8):785–788Google Scholar
  15. Wang JC (2007b) Very soft and thick coal seam coal face slab and prevention mechanism. J Coal 32(8):785–788Google Scholar
  16. Wang J-C, Wang L, Guo W (2014) Determination of support resistance based on roof and coal face control. J Coal 39(8):1619–1624Google Scholar
  17. Wang H-S, Zhang H-W, Chen C et al (2016) Study on mine strata behavior law of fully-mechanized top coal caving mining in contiguous coal seams. Coal Sci Technol 44(11):7–11Google Scholar
  18. Yang PJ, Liu CY, Wu FF (2012) Destruction law and instability mechanism of large mining face in thick coal seam. J China Univ Min Technol 41(3):371–377Google Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Shangshang Zheng
    • 1
  • Yahui Lou
    • 1
  • Dezhong Kong
    • 1
    • 2
    • 3
    Email author
  • Guiyi Wu
    • 1
  • Yong Liu
    • 1
  1. 1.Mining College of Guizhou UniversityGuiyangChina
  2. 2.Guizhou Coal Mine Design and Research InstituteGuiyangChina
  3. 3.China University of Mining and Technology (Beijing)BeijingChina

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