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Shear Characteristics of Cuneiform Reaming Anchorage Bolts in Coal Mine Roadways

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Abstract

Shear failure is the main failure mode of anchorage bolts in coal mines. To improve ground control, it is crucial to improve the shear strength of roadway anchorage systems. In this study, theoretical analysis, numerical simulation and laboratory experiments were carried out to study the shear characteristics of the cuneiform reaming anchorage. The results show that the cuneiform reaming anchorage can reduce the maximum shear stress on the cross section of the anchorage to improve the shear strength. The stress concentration near the joint planes can be transferred to middle parts of the bolts. Moreover, the cuneiform structure can also prolong the period in which the shear load of the anchorage decreases and shorten the period in which the shear load increases, thus reducing the shear load of the anchorage. This paper provides a new economical and practical method for raising the shear strength of an anchorage system and enhancing roadway stability.

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Abbreviations

f :

Friction between the joint planes (N)

q :

Uniformly distributed load applied to the anchorage (N/m)

Q :

Shear load of the rock mass (N)

l :

Shear length (m)

d :

Diameter of the bolt (m)

D :

Diameter of the anchorage (m)

F 0 :

Shear force on the anchorage section on the shear plane (N)

M :

Bending moment of the normal anchorage section on the shear plane (N m)

\({\tau _{{\text{Max}}0}}\) :

Maximum shear stress on the normal anchorage section (MPa)

\({S_{z,{\text{M}}ax0}}^{*}\) :

Static moment of the semicircular area of the normal anchorage cross section applied to the neutral axis z(m3)

\({I_z}\) :

Moment of inertia of the normal anchorage cross section applied to the neutral axis z (m3)

b :

Width of the normal anchorage cross section along the neutral axis z (m)

k :

Proportion coefficient

L :

Length of segment AB, OB and OA (m)

α :

Angle of the cuneiform reaming (°)

q 1 :

Uniform distributed load applied to the normal anchorage (N/m)

q 2 :

Uniform distributed load applied to the cuneiform reaming anchorage (N/m)

\(D^{\prime}\) :

Diameter of the cuneiform reaming anchorage (m)

F 1 :

Shear force on the cuneiform reaming anchorage cross section on the shear plane (N)

M 1 :

Bending moment of the cuneiform reaming anchorage cross section on the shear plane (N m)

\({\tau _{{\text{Max}}1}}\) :

Maximum shear stress on the cuneiform reaming anchorage cross section (MPa)

\({S_{z,{\text{M}}ax1}}^{*}\) :

Static moment of the semicircle area of the cuneiform reaming anchorage cross section applied to the neutral axis z (m3)

\({I_z}_{1}\) :

Moment of inertia of the cuneiform reaming anchorage cross section applied to the neutral axis z (m4)

b 1 :

Width of the cuneiform reaming anchorage cross section along the neutral axis z (m)

P AB :

Axial distance of the shear plastic hinge (mm)

P MN :

Shear displacement (mm)

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant nos. 51674098, 51274089, 51274087 and 51604094) and the Open Fund of the Research Center of Coal Resources Safe Mining and Clean Utilization of Liaoning (Grant no. LNTU16KF03). We thank Dalia Lahav-Jones, from Liwen Bianji, Edanz Group China (http://www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

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Authors and Affiliations

  1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

    Shaowei Liu, Mengxiong Fu & Housheng Jia

  2. Research Center of Coal Resources Safe Mining and Clean Utilization of Liaoning, Fuxin, 123000, China

    Shaowei Liu

  3. The Safety of Coal Production Collaborative Innovation Center, Jiaozuo, 454000, China

    Shaowei Liu & Housheng Jia

  4. Gas Research Branch, Chongqing Research Institute, Coal Technology and Engineering Group, Chongqing, 400037, China

    Wenbin Li

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  1. Shaowei Liu
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Correspondence to Mengxiong Fu or Housheng Jia.

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Liu, S., Fu, M., Jia, H. et al. Shear Characteristics of Cuneiform Reaming Anchorage Bolts in Coal Mine Roadways. Rock Mech Rock Eng 52, 1931–1943 (2019). https://doi.org/10.1007/s00603-018-1670-3

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