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基于统一强度理论和非关联流动法则,考虑中间主应力、围岩软化、剪胀和塑性区较小弹性模量等综合影响,推导了深埋圆形岩石隧道围岩特征曲线解析新解。采用较合理的Vlachopoulos公式确定隧道纵向位移释放系数,利用收敛限制法对比两种支护起始位置方法下支护压力的差异。研究结果表明:统一强度理论参数对围岩特征曲线和隧道纵向变形曲线的影响显著,考虑中间主应力效应可以更加充分发挥围岩的强度潜能,塑性区弹性模量和剪胀参数对围岩特征曲线的影响显著,不同支护起始位置方法确定的支护压力差异明显。
Based on the unified strength theory and the non-associated flow law, the new solution to the analysis of the surrounding rock characteristics of the deep buried circular rock tunnel is deduced considering the combined effect of intermediate principal stress, softening of surrounding rock, dilatancy and small elastic modulus of plastic zone. The more reasonable Vlachopoulos formula is used to determine the longitudinal displacement release coefficient of the tunnel. The difference of the support pressure under the two support starting positions is compared by using the convergence limit method. The results show that the unified strength theory has significant influence on the surrounding rock characteristic curve and the tunnel longitudinal deformation curve. Considering the middle principal stress effect, the strength potential of the surrounding rock can be fully exerted. The elastic modulus and dilatancy parameters of the plastic zone influence the surrounding rock characteristics The influence of the curve is significant, and the difference of the support pressure determined by the method of different support initial positions is obvious.