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Directional Support Method for Tunnel Jointed Rock Mass

Abstract

In order to explore the directional support method of jointed rock mass and ensure the stable operation of roadway, the support effect of jointed rock mass was analyzed by numerical simulation and on-site monitoring. The results showed that directional support could effectively reduce the deformation and ensured the stability of surrounding rock. In the process of directional reinforcement support construction, the plane formed by multiple bolts was guaranteed to be perpendicular to the structural plane, and the bolt hole extended along the normal plane of roadway, the control effect of this support mode was the best. The stress change law of surrounding rock of roadway was monitored by using borehole force meter. The results showed that the stress released occurs in surrounding rock of roadway after excavation, and the cumulative stress change value did not increase 5 to 7 days after excavation. The jointed rock mass remained in a stable state under the action of directional reinforcement support. The directional reinforcement of roadway surrounding rock had a good control effect on roadway stability.

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Acknowledgements

The financial support from the Beijing Municipal Natural Science Foundation (8214049) is appreciated.

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The paper writing was mainly carried out by XW and JX, JS, LZ and JG: performed the mechanical tests and the data analysis.

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Correspondence to Xu Wu.

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Wu, X., Xu, J., Zhang, L. et al. Directional Support Method for Tunnel Jointed Rock Mass. Geotech Geol Eng 40, 4171–4182 (2022). https://doi.org/10.1007/s10706-022-02148-z

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  • DOI: https://doi.org/10.1007/s10706-022-02148-z

Keywords

  • Jointed rock mass
  • Structural plane occurrence
  • Spatial distribution characteristics
  • Distortion energy criterion
  • Directional support
  • Numerical simulation