DOI: 10.11799/ce202502019
Research on stability and support optimization of rectangular roadways under biaxial unequal pressure using complex variable functions
ZHU Hongtao
Abstract：Given the propensity of rectangular roadways to induce stress concentration,the return air roadway of the 3202 working face in Wangcaihuopan Mine was investigated which is affected by the fire area.Employing complex variable function theory,a mechanical model was established for the surrounding rock stress of rectangular roadways and analytical solutions were derived for both stress distribution and plastic zone boundaries.The influences of roadway aspect ratio and lateral pressure coefficient on stress redistribution and plastic zone development were systematically analyzed.A comprehensive support strategy was proposed,integrating optimized bolt-cable support,I-steel arch reinforcement for surface deformation control,and grouting to enhance surrounding rock properties.Key findings reveal that the surrounding rock stress in rectangular roadways exhibits pronounced non-uniformity,with marked stress concentration at shoulder corners.The plastic zone develops in a X-shaped pattern,demonstrating strong coupling with stress redistribution in corner regions.The optimized support scheme substantially improves stress concentration stability,reducing roof subsidence to 37 mm and sidewall convergence to 19 mm,as validated by field measurements.These results confirm enhanced support-surrounding rock coupling and effective deformation control.
Keywords：surrounding rock stressrectangular roadwayscomplex variable function solutionsupport optimizationnumerical simulation
Publication Date：2025-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 133-141 )