Abstract
Conventional borehole pressure relief technologies cannot consider roadway anchorage support and pressure relief simultaneously, which is a disadvantage in that the integrity of the rock mass and supporting structure in the shallow surrounding rock anchorage zone is damaged when relieving and transferring stress. Therefore, this study proposes a new “anchorage + pressure relief” collaborative control technology to realize a trade-off between roadway anchorage support and pressure relief and to study its influencing factors. The proposed technology strengthens anchorage using bolt-cable-grouting in the shallow surrounding rock and excavates large-diameter holes for pressure relief in the stress peak zone outside the anchorage zone; both of these can help transfer the stress peak zones of the roadway sides to the deep surrounding rock without destroying the rock mass in the shallow anchorage zone. The stress evolution characteristics of the hole-making diameter, hole-making angle, and dynamic pressure coefficient on the pressure relief effect are analyzed via numerical simulations. A similarity simulation method is used to verify the effectiveness of the numerical simulation results and prove the feasibility of the proposed technology. Field engineering practice suggests that the maximum convergence of the two sides is 115 mm, and the stress of the anchor cable is < 200 kN after pressure relief via the internal hole-making operation. The deformation of the surrounding rock and stress of the anchor cables are within the safety restrictions. The study results help provide a new method and technical means for the continuous large-deformation control of the surrounding rock of the deep soft broken coal roadway under dynamic pressure disturbance.
Highlights
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Proposed new “anchorage + pressure relief” technology to strengthen anchorage using bolt-cable-grouting in shallow surrounding rock and excavate large-diameter holes for pressure relief in the stress peak zone outside the anchorage zone
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The proposed technology transfers the stress peak zone of the roadway sides to the deep surrounding rock without destroying the rock mass in the shallow anchorage zone
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Compared with the conventional borehole pressure relief technology, the proposed technology solves the contradiction between roadway anchorage support and pressure relief
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Studied the stress evolution characteristics of the hole-making diameter, hole-making angle, and dynamic pressure coefficient on the pressure relief effect
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Data availability
The datasets generated or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 52074296 and 52004286), the China Postdoctoral Science Foundation (No. 2020T130701), and the Fundamental Research Funds for the Central Universities (No. 2022XJNY02 and 2022YJSNY18).
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Xie, S., Jiang, Z., Chen, D. et al. A New Pressure Relief Technology by Internal Hole-Making to Protect Roadway in Two Sides of Deep Coal Roadway: A Case Study. Rock Mech Rock Eng 56, 1537–1561 (2023). https://doi.org/10.1007/s00603-022-03135-9
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DOI: https://doi.org/10.1007/s00603-022-03135-9