Skip to main content
SpringerLink
Log in

Effects of the Deviatoric Stress Ratio on the Coal Failure and Permeability During Deep Mining

  • Original Paper
  • Published:
Geotechnical and Geological Engineering Aims and scope Submit manuscript

Abstract

Practices show that the triaxial stress change of mining-disturbed coal deeply affects its failure and permeability characteristics and easily cause the coal and rock dynamic disasters during deep underground mining process. The combined mechanic-damage-permeability experiments of gas-bearing coal were carried out under the mechanical paths of conventional triaxial compression (CTC), fixing axial pressure and unloading confining pressure (FAPUCP) and loading axial pressure and unloading confining pressure (LAPUCP). Then the effects of the deviatoric stress ratio (DSR) on the damage and permeability characteristics of coal were analyzed. The results proved that the distinguishing deformation and strength characteristics of coal were showed due to the different mechanical paths and the coal specimens were converted from brittle deformation to plastic deformation with the effect of higher confining pressure. The coal specimens of the three mechanical paths generated the main shear failure, tensile-shear failure and ‘X’ conjugate shear failure, respectively, and the fracture angles decreased in order. The damage and permeability of coal specimens could be more and more severe in the order of CTC, FAPUCP and LAPUCP paths, which was due to the different DSR. Thus, the deep mining-disturbed coal of lager DSR is seriously prone to cause the coal and rock dynamic disasters. The corresponding measures should be taken to reduce the DSR of mining-disturbed coal and then avoid the dynamic disasters.

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

Access this article

Log in via an institution

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

Instant access to the full article PDF.

Institutional subscriptions

Fig.1
Fig.2
Fig.3
Fig.4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig.11

Similar content being viewed by others

References

  • Cai Y et al (2014) Permeability evolution in fractured coal—combining triaxial confinement with X-ray computed tomography, acoustic emission and ultrasonic techniques. Int J Coal Geol 122:91–104

    Article  Google Scholar 

  • Chen H, Cheng Y, Zhou H, Li W (2013) Damage and permeability development in coal during unloading. Rock Mech Rock Eng 46:1377–1390

    Article  Google Scholar 

  • Chen H, Cheng Y, Ren T, Zhou H, Liu Q (2014) Permeability distribution characteristics of protected coal seams during unloading of the coal body International. J Rock Mech Min Sci 71:105–116

    Article  Google Scholar 

  • Cheng J, Cheng W, Zhang S (2012) Methods to determine the mine gas explosibility-An overview. J Loss Prevent Proc 25:425–435

    Article  Google Scholar 

  • Hashiba K, Okubo S, Fukui K (2006) A new testing method for investigating the loading rate dependency of peak and residual rock strength. Int J Rock Mech Min Sci 43:894–904

    Article  Google Scholar 

  • Huang B, Liu J (2013) The effect of loading rate on the behavior of samples composed of coal and rock. Int J Rock Mech Min Sci 61:23–30

    Article  Google Scholar 

  • Jasinge D, Ranjith PG, Choi SK, Kodikara J, Arthur M, Li H (2009) Mechanical properties of reconstituted Australian black coal. J Geotech Geoenviron 135:980–985

    Article  Google Scholar 

  • Jiang C et al (2017) Experimental study on seepage properties, AE characteristics and energy dissipation of coal under tiered cyclic loading. Eng Geol 221:114–123

    Article  Google Scholar 

  • Kong S, Cheng Y, Ren T, Liu H (2014) A sequential approach to control gas for the extraction of multi-gassy coal seams from traditional gas well drainage to mining-induced stress relief. Appl Energ 131:67–78

    Article  Google Scholar 

  • Li W et al (2015) Addressing the CO2 emissions of the world's largest coal producer and consumer: Lessons from the Haishiwan Coalfield, China. Energy 80:400–413

    Article  Google Scholar 

  • Li M, Cao J, Li W (2016) Stress and damage induced gas flow pattern and permeability variation of coal from Songzao Coalfield in Southwest China. Energies 9:351

    Article  Google Scholar 

  • Lu S, Cheng Y, Li W (2016) Model development and analysis of the evolution of coal permeability under different boundary conditions. J Nat Gas Sci Eng 31:129–138

    Article  Google Scholar 

  • Lu S, Li L, Cheng Y, Sa Z, Zhang Y, Yang N (2017) Mechanical failure mechanisms and forms of normal and deformed coal combination containing gas: model development and analysis. Eng Fail Anal 80:241–252

    Article  Google Scholar 

  • Lu S, Zhang Y, Sa Z, Si S (2019a) Evaluation of the effect of adsorbed gas and free gas on mechanical properties of coal. Environ Earth Sci 78:218

    Article  Google Scholar 

  • Lu S, Zhang Y, Sa Z, Si S, Shu L, Wang L (2019b) Damage-induced permeability model of coal and its application to gas predrainage in combination of soft coal and hard coal. Energy Sci Eng 7(4):1352–1367

    Article  Google Scholar 

  • Medhurst TP, Brown ET (1998) A study of the mechanical behaviour of coal for pillar design. Int J Rock Mech Min Sci 35:1087–1105

    Article  Google Scholar 

  • Ma N, Li J, Zhao Z (2015) Distribution of the deviatoric stress field and plastic zone in circular roadway surrounding rock. J China Univ Min Technol 44(2):206–213

    Google Scholar 

  • Pan R, Cheng Y, Yuan L, Yu M, Dong J (2014) Effect of bedding structural diversity of coal on permeability evolution and gas disasters control with coal mining. Nat Hazards 73:531–546

    Article  Google Scholar 

  • Thornton C, Zhang L (2010) On the evolution of stress and microstructure during general 3D deviatoric straining of granular media. Géotechnique 60:333–341

    Article  Google Scholar 

  • Wang Z, Luo Y, Guo H, Tian H (2012) Effects of initial deviatoric stress ratios on dynamic shear modulus and damping ratio of undisturbed loess in China. Eng Geol 143–144:43–50

    Article  Google Scholar 

  • Wang S, Elsworth D, Liu J (2013) Permeability evolution during progressive deformation of intact coal and implications for instability in underground coal seams. Int J Rock Mech Min Sci 58:34–45

    Article  Google Scholar 

  • Xie H, Ju Y, Gao F, Gao M, Zhang R (2017) Groundbreaking theoretical and technical conceptualization of fluidized mining of deep underground solid mineral resources. Tunn Undergr Space Technol 67:68–70

    Article  Google Scholar 

  • Xu P, Yang S (2016) Permeability evolution of sandstone under short-term and long-term triaxial compression. Int J Rock Mech Min Sci 85:152–164

    Article  Google Scholar 

  • Xu C, Cheng Y, Ren T, Wang L, Kong S, Lu S (2014) Gas ejection accident analysis in bed splitting under igneous sills and the associated control technologies: a case study in the Yangliu Mine, Huaibei Coalfield, China. Nat Hazards 71:109–134

    Article  Google Scholar 

  • Xu C, Yuan L, Cheng Y, Wang K, Zhou A (2016) Square-form structure failure model of mining-affected hard rock strata: theoretical derivation, application and verification. Environ Earth Sci 75:1180

    Article  Google Scholar 

  • Xu C, Fu Q, Cui X, Wang K, Zhao Y, Cai Y (2019) Apparent-depth effects of the dynamic failure of thick hard rock strata on the underlying coal mass during underground mining. Rock Mech Rock Eng 52:1565–1576

    Article  Google Scholar 

  • Xue Y et al (2017) Mechanical behaviour and permeability evolution of gas-containing coal from unloading confining pressure tests. J Nat Gas Sci Eng 40:336–346

    Article  Google Scholar 

  • Xue Y, Gao F, Liu X (2015) Effect of damage evolution of coal on permeability variation and analysis of gas outburst hazard with coal mining. Nat Hazards 79:999–1013

    Article  Google Scholar 

  • Yin G, Jiang C, Wang JG, Xu J (2013) Combined effect of stress, pore pressure and temperature on methane permeability in anthracite coal: an experimental study. Transport Porous Med 100:1–16

    Article  Google Scholar 

  • Zhang Q, Fan X, Liang Y, Li M, Li G, Ma T, Nie W (2017a) Mechanical behavior and permeability evolution of reconstituted coal samples under various unloading confining pressures—implications for wellbore stability analysis. Energies 10:292

    Article  Google Scholar 

  • Zhang X, Zhang D, Leo C, Yin G, Feng D, Liyanapathirana DS (2017b) Damage evolution and post-peak gas permeability of raw coal under loading and unloading conditions. Transport Porous Med 117:465–480

    Article  Google Scholar 

  • Zhao XG et al (2014) Influence of unloading rate on the strainburst characteristics of Beishan granite under true-triaxial unloading conditions. Rock Mech Rock Eng 47:467–483

    Article  Google Scholar 

  • Zhu WC, Wei CH, Li S, Wei J, Zhang MS (2013) Numerical modeling on destress blasting in coal seam for enhancing gas drainage. Int J Rock Mech Min 59:179–190

    Article  Google Scholar 

Download references

Acknowledgements

The work was supported by the National Natural Science Foundation of China (Grant No. 51974321, 51874314 and 51774292).

Author information

Authors and Affiliations

  1. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology-Beijing, Beijing, 100083, China

    Chao Xu, Qiang Fu, Kai Wang, Chaofei Guo & Xiaofang Li

  2. School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China

    Chao Xu, Qiang Fu, Kai Wang, Chaofei Guo & Xiaofang Li

  3. Yangquan Coal Industry (Group) Co., Ltd., Yangquan, 045000, China

    Chao Xu

Authors
  1. Chao Xu
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Qiang Fu
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Kai Wang
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Chaofei Guo
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Xiaofang Li
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Kai Wang.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Xu, C., Fu, Q., Wang, K. et al. Effects of the Deviatoric Stress Ratio on the Coal Failure and Permeability During Deep Mining. Geotech Geol Eng 38, 6093–6105 (2020). https://doi.org/10.1007/s10706-020-01417-z

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10706-020-01417-z

Keywords

Search

Navigation