中厚煤层回采巷道变形机理及其力学模型建立

Deformation mechanism of thick seam roadway and establishment of mechanical model

为了能够准确揭示回采巷道矿压显现规律及其稳定性特征,并对其进行有效控制,运用关键层理论和流变力学对回采巷道围岩结构进行了分类,建立了反映巷道整体结构特征的两种基本顶断裂力学模型和相应的力学本构模型,建立了"应力比"概念和回采巷道随时间推移变形的理论依据,得出了围岩结构优化理论途径。结论表明:然后通过变形元件组合模型来模拟材料的变形特性是完全可行的,应力比γ≥1时,围岩应变随时间推移而增大;γ<1时,围岩应变增长率随时间推移而减小,增大mσax,即优化巷道围岩结构可降低应力比影响程度。

To study the mining roadway strata-pressure behaviours and its stability characteristics, key strata theory and rheological mechanics were used to classify the structures. Two mechanical models of basic roof fracture were built. The concept of ＂stress ratio＂ and the theoretical basis of roadway time-lapse deformation were built. Ways to improve the stability of the surrounding rock structure were defined. Results show that material deformation mechanics is completely feasible, and that when ＂stress ratio＂ is equal to or larger than 1, the surrounding rocks strain increases with time, that when ＂stress ratio＂γ is lesser than 1, that surrounding rocks strain decreases with time, and that it is feasible to lower influence degree of ＂stress ratio＂ by increasing σmax that is to improve roadway surrounding rock structure.