多因素影响下巷道围岩稳定性分析及优化设计研究OA北大核心CSTPCD

To address the issue of severe mine pressure manifestations and difficult-to-control deforma-tion in deep coal seam roadways,an orthogonal numerical simulation experiment was conducted based on the Kastner formula.This experiment examined five factors affecting the stability of roadway sur-rounding rock:height-to-width ratio,lateral pressure coefficient,depth,cross-sectional shape,and sur-rounding rock strength.Sensitivity of each factor to roadway deformation and damage was studied using variance analysis and intuitive analysis charts.The stress distribution patterns of elliptical and rectangu-lar roadways under different lateral pressure coefficients and height-to-width ratios were analyzed using the plane elasticity complex variable function theory.Optimal designs for the height-to-width ratio and shape of elliptical and rectangular roadways were developed.The results showed that the main factors af-fecting the stability of surrounding rock are the strength of the surrounding rock and the lateral pressure coefficient,while depth,cross-sectional shape,and height-to-width ratio are secondary factors.Elliptical roadways exhibit the smallest difference in surrounding rock stress under isotropic stress rati-os.Rectangular roadways have lower stress concentration when the width is 5 m and the height-to-width ratio is approximately 0.6.For areas with rapid stress increase in rectangular roadways,an optimized rounded rectangular roadway was designed considering bearing characteristics and cross-sectional utili-zation,and a calculation formula for the corner radius was established.The optimization performance of this design was verified through numerical simulation.