SpringerLink
Log in

Comprehensive safety factor of roof in goaf underdeep high stress

深部高应力下采空区顶板综合安全系数

  • Published:
Journal of Central South University Aims and scope Submit manuscript

Abstract

The safety factor of roof under deep high stress is a quantitative index for evaluating roof stability. Based on the failure mode of surrounding rock of stope roof, the mechanics model of goaf roof is constructed, and the internal force of roof is deduced by the theory of hingeless arch. The calculation method of roof safety factor (K) under the environment of deep mining is proposed in view of compression failure and shear failure of roof. The calculation formulas of shear safety factor (K1), compression safety factor (K2) and comprehensive safety factor (K) of roof are given. The influence of stope span and roof thickness on roof stability is considered in this paper. The results show that when the roof thickness remains constant, the roof safety factor decreases with the increasing of the stope span; when the stope span remains constant, the roof safety factor increases with the increasing of the roof thickness. The deep mining example shows that when the stope span is 30 m and the roof thickness is 10 m, the roof comprehensive safety factor is 1.12, which indicates the roof is in a stable state.

摘要

深部高应力下顶板安全系数是评价顶板稳定性的定量评价指标. 基于采场顶板围岩破坏形式, 构建了空区顶板力学模型, 利用无铰拱理论推导顶板内力大小. 针对顶板压缩、 剪切破坏形式, 提出了深部开采环境下顶板安全系数(K)的计算方法, 给出矿柱剪切安全系数(K1)、 压缩安全系数(K2)和综合安全系数(K)的计算式, 研究采场跨度、 顶板厚度对顶板稳定性的影响. 结果表明, 当顶板厚度一定时, 顶板安全系数随着采场跨度的增加而递减; 当采场跨度一定时, 顶板安全系数随着顶板厚度的增加而递增. 该矿深部开采实例表明, 在采场跨度为 30 m, 顶板厚度为 10 m 的条件下, 顶板综合安全系数为 1.12 时, 顶板处于稳定状态。

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Subscribe and save

Springer+ Basic
EUR 32.99 /Month
  • Get 10 units per month
  • Download Article/Chapter or Ebook
  • 1 Unit = 1 Article or 1 Chapter
  • Cancel anytime
Subscribe now

Buy Now

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. SUN Jian, HU Yang, ZHAO Guang-ming. Relationship between water inrush from coal seam floors and main roof weighting [J]. International Journal of Mining Science and Technology, 2017, 27(5): 873–881. DOI: https://doi.org/10.1016/j.ijmst.2017.07.010.

    Article  Google Scholar 

  2. YAN Hong, ZHANG Ji-xiong, LI Lin-yue, FENG Min-rui, LI Tian-tong. Prediction of upper limit position of bedding separation overlying a coal roadway within an extra-thick coal seam [J]. Journal of Central South University, 2018, 25(2): 448–460. DOI: https://doi.org/10.1007/s11771-018-3749-0.

    Article  Google Scholar 

  3. HU Jian-hua, LEI Tao, ZHOU Ke-**, LUO **an-wei, YANG Nian-ge. Mechanical response of roof rock mass unloading during continuous mining process in underground mine [J]. Transactions of Nonferrous Metals Society of China, 2011, 21(12): 2727–2733. DOI: https://doi.org/10.1016/S1003-6326(11)61116-3.

    Article  Google Scholar 

  4. MERIEL Y, GABRIEL W, ELIZABETH H. Investigation of factors influencing roof stability at a Western U.S. longwall coal mine [J]. International Journal of Mining Science and Technology, 2019, 29(1): 139–143. DOI: https://doi.org/10.1016/j.ijmst.2018.11.019.

    Article  Google Scholar 

  5. HAN Chang-liang, ZHANG Nong, RAN Zhi, GAO Rui, YANG Hou-qiang. Superposed disturbance mechanism of sequential overlying strata collapse for gob-side entry retaining and corresponding control strategies [J]. Journal of Central South University, 2018, 25(9): 2258–2271. DOI: https://doi.org/10.1007/s11771-018-3911-8.

    Article  Google Scholar 

  6. CHEN **n-ming, JIN **ang-fei, JIAO Hua-zhe, YANG Yi-xuan, LIU Juan-hong. Pore connectivity and dewatering mechanism of tailings bed in raking deep-cone thickener process [J]. Minerals, 2020, 10(4): 375–397. DOI: https://doi.org/10.3390/min10040375.

    Article  Google Scholar 

  7. YANG Yi-xuan, ZHAO Tong-qian, JIAO Hua-zhe, WANG Yun-fei, LI Hai-yan. Potential effect of porosity evolution of cemented paste backfill on selective solidification of heavy metal ions [J]. International Journal of Environmental Research and Public Health, 2020, 17(3): 814–830. DOI: https://doi.org/10.3390/ijerph17030814.

    Article  Google Scholar 

  8. WANG Qi, LUAN Ying-cheng, JIANG Bei, LI Shu-cai, YU Heng-chang. Mechanical behaviour analysis and support system field experiment of confined concrete arches [J]. Journal of Central South University, 2019, 26(4): 970–983. DOI: https://doi.org/10.1007/s11771-019-4064-0.

    Article  Google Scholar 

  9. WU Ai-xiang, SHEN Hui-ming, JIANG Li-chun, JIAO Hua-zhe, WANG Yi-ming. Arching effect of long-narrow cemented paste backfill body and its effect on target strength [J]. The Chinese Journal of Nonferrous Metals, 2016, 26(3): 648–654. DOI: https://doi.org/10.19476/j.ysxb.1004.0609.2016.03.021. (in Chinese)

    Google Scholar 

  10. SWIFT G M, REDDISH D J. Stability problems associated with an abandoned ironstone mine [J]. Bulletin of Engineering Geology and the Environment, 2002, 61(3): 227–239. DOI: https://doi.org/10.1007/s10064-001-0147-9.

    Article  Google Scholar 

  11. YANG Yu-jiang, GAO Han, LI Yuan-hui. Analysis on roof stability of concealed gob area under additional loading [J]. Journal of Northeastern University (Natural Science), 2011, 32(9): 1332–1335. DOI: https://doi.org/10.12068/j.issn.1005-3026.2011.09.029. (in Chinese)

    Google Scholar 

  12. LIU **ao-bo, AN Long, ZHANG Feng-peng. Analysis on roof stability of gob area based on thin plate theory [J]. Journal of Northeastern University (Natural Science), 2012, 33(11): 1628–1632. DOI: https://doi.org/10.12068/j.issn.1005-3026.2012.11.027. (in Chinese)

    Google Scholar 

  13. ZHAO Yan-lin, WU Qi-hong, WANG Wei-jun, WAN Wen, ZHAO Fu-jun. Strength reduction method to study stability of goaf overlap** roof based on catastrophe theory [J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(7): 1424–1434. https://kns.cnki.net/kcms/detail/detail.aspx?dbcode=CJFD&dbname=CJFD2010&filename=YSLX201007019&v=twlOvu6SzOMyuwPZgI9SHx4xrmqMJWt%25mmd2BTiasREIVkpMfvycIFevgz2v8kvEwClZ4. (in Chinese)

    Google Scholar 

  14. XU Heng, WANG Yi-ming, WU Ai-xiang, LI Fang-fang, GAO Wei-hong. A computational model of safe thickness of roof under filling body based on cusp catastrophe theory [J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(3): 579–586. DOI: https://doi.org/10.13722/j.cnki.jrme.2016.0199. (in Chinese)

    Google Scholar 

  15. DU Chun-hang, CAO **, CHEN Yu, LIU Jie, ZHAO Yan-lin, LIU **g-shuo. Study on the stability and deformation of the roadway subjected to high in-situ stresses [J]. Geotechnical & Geological Engineering, 2017, 35(4): 1–14. DOI: https://doi.org/10.1007/s10706-017-0197-9.

    Article  Google Scholar 

  16. XIE Sheng-rong, PAN Hao, ZENG Jun-chao, WANG En, CHEN Dong-dong, ZHANG Tao, PENG Xue-jiao, YANG Jun-hui, CHEN Feng, QIAO Shun-xing. A case study on control technology of surrounding rock of a large section chamber under a 1200-m deep goaf in **ngdong coal mine, China [J]. Engineering Failure Analysis, 2019, 104: 112–125. DOI: https://doi.org/10.1016/j.engfailanal.2019.05.039.

    Article  Google Scholar 

  17. ZHANG Guang-chao, HE Fu-lian, LAI Yong-hui, JIA Hong-guo. Ground stability of underground gateroad with 1 km burial depth:A case study from **ngdong coal mine, China [J]. Journal of Central South University, 2018, 25(6): 1386–1398. DOI: https://doi.org/10.1007/s11771-018-3834-4.

    Article  Google Scholar 

  18. LI Shu-cai, WANG Hong-tao, WANG Qi, JIANG Bei, WANG Fu-qi, GUO Nian-bo, LIU Wen-**ag, REN Yao-xi. Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress [J]. Journal of Central South University, 2016, 23(2): 440–448. DOI: https://doi.org/10.1007/s11771-016-3089-x.

    Article  Google Scholar 

  19. LIANG Ning, WU Fa-quan, WANG Yun-feng, BAO Han. Analysis of defornation and failure of rock mass of deep Guanshan tunnel under high in situ stress [J]. Rock and Soil Mechanics, 2016, 37(Supp. 2): 330–336. DOI: https://doi.org/10.16285/j.rsm.2016.S2.041. (in Chinese)

    Google Scholar 

  20. ZHANG Hua-lei, TU Min, CHENG Hua, TANG Yong-zhi. Breaking mechanism and control technology of sandstone straight roof in thin bedrock stope [J]. International Journal of Mining Science and Technology, 2020, 30(2): 259–263. DOI: https://doi.org/10.1016/j.ijmst.2018.10.006.

    Article  Google Scholar 

  21. LIU Chuang, LI Hua-min, MITRI H, JIANG Dong-jie, LI Hui-gui, FENG Jun-fa. Voussoir beam model for lower strong roof strata movement in longwall mining-Case study [J]. Journal of Rock Mechanics and Geotechnical Engineering, 2017, 9(6): 1171–1176. DOI: https://doi.org/10.1016/j.jrmge.2017.07.002.

    Article  Google Scholar 

  22. JIAO Hua-zhe, WANG Shu-fei, WU Ai-xiang, SHEN Hui-ming, WANG Jian-dong. Cementitious property of NaAlO2-activated Ge slag as cement supplement [J]. International Journal of Minerals Metallurgy and Materials, 2019, 26(12): 1594–1603. DOI: https://doi.org/10.1007/s12613-019-1901-y.

    Article  Google Scholar 

  23. LIU **-ling, LUO Ke-bing, LI **-bing, LI Qi-yue, WANG Wei-hua, GONG Feng-qiang. Cap rock blast caving of cavity under open pit bench [J]. Transactions of Nonferrous Metals Society of China, 2017, 27(3): 648–655. DOI: https://doi.org/10.1016/S1003-6326(17)60072-4.

    Article  Google Scholar 

  24. JIANG Li-chun, YANG Chao, JIAO Hua-zhe. Ultimately exposed roof area prediction of bauxite deposit goaf based on macro joint damage [J]. International Journal of Mining Science and Technology, 2020, 30(5): 699–704. DOI: https://doi.org/10.1016/j.ijmst.2020.06.005.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, 510640, China

    Li-chun Jiang  (姜立春)

  2. Institute of Safety Science and Engineering, South China University of Technology, Guangzhou, 510640, China

    Li-chun Jiang  (姜立春), Yu-dan Wang  (王玉丹) & Ge-ge Wang  (王格格)

  3. School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

    Hua-zhe Jiao  (焦华喆)

Authors
  1. Li-chun Jiang  (姜立春)
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Hua-zhe Jiao  (焦华喆)
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Yu-dan Wang  (王玉丹)
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Ge-ge Wang  (王格格)
    View author publications

    You can also search for this author in PubMed Google Scholar

Contributions

JIANG Li-chun provided the concept and edited the draft of manuscript. JIAO Hua-zhe established the models and wrote the first draft of the manuscript. WANG Yu-dan conducted the literature review and analyzed the calculated results. WANG Ge-ge edited the draft of manuscript. All authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Hua-zhe Jiao  (焦华喆).

Ethics declarations

JIANG Li-chun, JIAO Hua-zhe, WANG Yu-dan, and WANG Ge-ge declare that they have no conflict of interest.

Additional information

Foundation item: Projects(51974135, 51704094) supported by the National Natural Science Foundation of China; Project(2016YFC0600802) supported by the National Key Research and Development Program of China; Project(2020M672226) supported by the China Postdoctoral Science Foundation

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Jiang, Lc., Jiao, Hz., Wang, Yd. et al. Comprehensive safety factor of roof in goaf underdeep high stress. J. Cent. South Univ. 28, 595–603 (2021). https://doi.org/10.1007/s11771-021-4624-y

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11771-021-4624-y

Key words

关键词

Search

Navigation