School of Energy and Mining Engineering,China University of Mining and Technology-Beijing
Research Center of Roadway Support and Disaster Prevention Engineering in Coal Industry

针对深部煤层巷道矿压显现剧烈且巷道变形难以控制的问题,基于Kastner公式对巷道高宽比、侧压系数、埋深、断面形状、围岩强度5种影响巷道围岩稳定性的因素展开正交数值模拟实验,通过方差和直观分析图法研究了各因素对巷道变形破坏的敏感性。采用平面弹性复变函数理论分析了不同侧压系数与巷道高宽比下椭圆和矩形巷道围岩的应力分布规律,对椭圆形和矩形巷道宽高比和形状进行了优化设计。研究结果表明:围岩强度与侧压系数是影响巷道围岩稳定性的主要因素,埋深、断面形状、巷道高宽比为次要因素;椭圆形巷道在等轴应力比下围岩应力差值最小;矩形巷道宽度为5m、高宽比为0.6左右时,应力集中程度较小;针对矩形巷道应力快速增高区,在考虑承压特性和断面利用率的基础上设计了圆角矩形优化巷道,确立了圆角半径的计算公式,通过数值模拟验证了其良好的性能。

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- OF MINING SCIENCE AND TECHNOLOGY 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 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.

刘洪涛,周光东,韩子俊,等.多因素影响下巷道围岩稳定性分析及优化设计研究[J].矿业科学学报,2024,9(4):504-518.

LIU Hongtao,ZHOU Guangdong,HAN Zijun,et al. Stability analysis and optimization design of roadway surrounding rock under multiple factors[J]. Journal of Mining Science and Technology,2024,9(4):504-518.