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合理的开挖面空间效应方法是充分调动与发挥围岩自承载能力的前提,对2种代表性的开挖面空间效应方法:T-N(09)支护力系数法和V-D(09)位移释放系数法,进行了来源、因素考虑、适用范围、空间效应实现及收敛约束差异等的定性与定量比较。研究结果表明:2种开挖面空间效应方法都易与围岩特征曲线相结合,便于实际工程应用,且在一定参数范围内二者具有很好的一致性;T-N(09)支护力系数法仅适用于理想弹-塑性围岩,得到的支护压力偏小、围岩稳定变形偏大,应对其材料模型及参数范围进行有效拓展;V-D(09)位移释放系数法适用于各种弹塑性围岩,能较直观地反映开挖面空间效应的变化及影响范围,具有广泛的工程应用前景。
The reasonable excavation surface space effect method is the premise of fully mobilizing and exerting the self-bearing capacity of surrounding rock. Two representative methods of space effect of excavation surface are proposed: TN (09) support force coefficient method and VD (09) displacement release Coefficient method, the origin, factor considerations, the scope of application, the realization of spatial effects and convergence constraints such as qualitative and quantitative comparison. The results show that both of the two kinds of excavation surface space effect methods are easily combined with the surrounding rock characteristic curve, which is convenient for practical engineering application and has good consistency within a certain parameter range. The TN (09) support force coefficient The method is only applicable to the ideal elastic-plastic surrounding rock, the supporting pressure is too small, the stability of the surrounding rock is too large, and its material model and parameter range should be effectively expanded. The VD (09) displacement release coefficient method is suitable for all kinds of bombs The plastic surrounding rock can more directly reflect the change and influence range of the space effect of the excavation face and has a wide range of engineering application prospects.