Abstract
To study the stability of roof areas in the process of rapid driving in coal roadways, the deformation law of roof areas under the interaction of different factors is systematically analyzed through mechanical analysis, numerical calculation, and industrial testing, yielding a reasonable selection basis of the critical parameters of roof space stability. The roof is difficult to control when the unsupported roof distance exceeds 2.0 m and the roof thickness is less than 0.9 m. Considering the tunnel excavation safety and effectiveness, the support technology principles of "large-angle control span" and "classification control technology of roadway surrounding rock stability" based on the support "small-step" excavation method were realized in the case study of the 150,802 machine roadway of Liuzhuang Coal Mine, China. The resulting rapid tunneling system made it possible to increase the tunneling speed from 300 to 500 m/month, i.e. by 67%. The whole roadway remained relatively stable, verifying the proposed approach feasibility.
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Data Availability
The data used in the field measurement can be obtained from the corresponding author upon request.
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Funding
We acknowledge the financial support for this work provided by The Tiandi Technology Co., Ltd., For The Provided Funding Of The Science And Technology Innovation And Entrepreneurship Fund (2021-2-TD-ZD008) (Research On Self-Relief Technology And Equipment Of Bedding Directional Hydraulic Slitting); The State Key Laboratory Open Fund Project (SKLMRDPC20KF01) (Prevention And Control Technology Of Cross-Cutting, Longitudinal Breaking, Unloading And Energy Dissipation For Coal-Rock Composite Dynamic Disasters In Deep Mines); Key project of the National Natural Science Foundation of China Regional Innovation and Development Joint Fund (U21A20110), risk identification and precise prevention and control of coal and rock dynamic disasters in deep high gas soft coal seams.
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Niu, X. Roof Stability Mechanism and Support Technology Optimization of Tunneling Roadway. Geotech Geol Eng 42, 561–574 (2024). https://doi.org/10.1007/s10706-023-02589-0
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DOI: https://doi.org/10.1007/s10706-023-02589-0