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| Deformation failure mechanism and reinforcement technology of roadway in deep water-rich fractured surrounding rock |
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Received:December 02, 2024
Revised:March 11, 2025
Accepted:March 12, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2026.01.004 |
| KeyWord:deep roadway;fractured surrounding rock;water-rich;instability mechanism;combined support |
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| China Coal Research lnstitute, Beijing 100013, China |
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| Abstract: |
| Aiming at the problems of high stress, low strength of surrounding rock, and the susceptibility to softening and weakening under seepage in deep water-rich fractured surrounding rock roadways, leading to large deformations and difficult support, this study takes the No. 3302 track roadway of Bulianqou Coal Mine as the engineering background. Through comprehensive means such as field monitoring, borehole observation, and in-situ stress measurement, the main factors causing surrounding rock instability are revealed high ground stress, low support strength, and incompatibility between the support system and surrounding rock deformation. The deformation and failure patterns of the roadway surrounding rock are analyzed through numerical simulation. Consequently, a coordinated support scheme of "inverted arch+bolt/cable+metal mesh+shotcrete+deep/shallow hole grouting" is proposed. Field application results indicate that after implementing the optimized support, the maximum roof-floor convergence of the roadway is 176 mm, the maximum sidewall convergence is 141 mm, and the maximum floor heave is 84 mm. Compared with the original support scheme, the maximum values of roof subsidence, sidewall convergence, and floor heave are reduced by 90.3%, 87.5%, and 82.8%, respectively. The forces on bolts and cables remain stable, effectively controlling the deformation and failure of the roadway surrounding rock. |
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