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. 2024 Jun 7;10(12):e32658.
doi: 10.1016/j.heliyon.2024.e32658. eCollection 2024 Jun 30.

Gradient failure mechanism and control technology of deep roadways under the action of deviatoric stress field

Hai Long Wang  1   2 , Dong Liu  1 , Ren Liang Shan  1 , Yan Zhao  2 , Zhao Long Li  3 , Xiao Tong  4
Affiliations

Gradient failure mechanism and control technology of deep roadways under the action of deviatoric stress field

Hai Long Wang et al. Heliyon. .

Abstract

Deformation control of deep roadways is a major challenge for mine safety production. Taking a deep roadway with a burial depth of 965 m in a mine in North China as the engineering background, on-site investigation found that significant creep deformation occurred in the surrounding rock of the roadway. The original supporting U-shaped steel support failed due to insufficient supporting strength. The rock mass near the roadway experienced a transition from triaxial stress conditions to biaxial and even uniaxial stress states as a result of excavation and unloading, leading to a gradient stress distribution in the surrounding rock. From the perspective of the roadway's deviatoric stress field distribution, we investigated the gradient failure mechanism of the roadway and validated it through theoretical analysis and numerical simulations. The study found that the ratio of horizontal principal stress and vertical principal stress determines the distribution shape of the surrounding rock deviatoric stress field. The gradient distribution of the stress field in the roadway will cause time-related deformation of the roadway, which will lead to large deformation and failure of the roadway. Based on this, the control mechanism of roadway gradient failure was studied, and then a combined support technology of CFST supports with high bearing capacity was proposed.

Keywords: CFST support; Deviatoric stress distribution; Gradient failure; Roadway deformation control.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Figures

Fig. 1
Fig. 1
Roadways layout [34].
Fig. 2
Fig. 2
Deformation characteristics of roadway.
Fig. 3
Fig. 3
Schematic diagram of gradient failure of roadway caused by excavation.
Fig. 4
Fig. 4
Damage and destruction of surrounding rock in roadway.
Fig. 5
Fig. 5
Mechanical model of non-isobaric circular roadway (m).
Fig. 6
Fig. 6
Deflector stress distribution diagram of roadway.
Fig. 7
Fig. 7
Maximum shear stress strength criterion.
Fig. 8
Fig. 8
Plastic zone radius distribution of roadway.
Fig. 9
Fig. 9
Numerical calculation model.
Fig. 10
Fig. 10
Deviator stress distribution cloud diagram of roadway under different lateral pressure coefficients.
Fig. 11
Fig. 11
Stress distribution of surrounding rocks in deep roadways.
Fig. 12
Fig. 12
Indoor contrast test of steel tube concrete support and U36 steel arch frame [33].
Fig. 13
Fig. 13
Load-displacement curves of CFST Support and U36 steel arches.
Fig. 14
Fig. 14
U-shaped steel support damage phenomenon.
Fig. 15
Fig. 15
CFST support design.
Fig. 16
Fig. 16
Laneway displacement (m).
Fig. 17
Fig. 17
Development of roadway plastic zone.
Fig. 18
Fig. 18
Roadway displacement monitoring under joint support.
Fig. 19
Fig. 19
Field application of CFST supports.
See this image and copyright information in PMC

References

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