深埋破碎围岩隧道围岩特征曲线及注浆加固范围

Research of ground characteristic curve and grouting range on the deep tunnel within cracked surrounding rocks

借助新奥法和新意法基本思想,采用数值模拟方法,研究了不同注浆加固圈厚度作用下,马蹄形深埋隧道围岩特征曲线及最佳注浆加固范围,结果表明:注浆加固能有效减小围岩松动压力,延迟初支支护时机,减小支护结构荷载承担比率,通过围岩反力释放率与注浆圈厚度关系可得到最佳注浆范围。

Taking the basic idea of new Austrian method and new method, using the numerical simulation method, this paper researched the sur-rounding rock characteristic curves and optimum grouting reinforcement range of horseshoe deep tunnel under different grouting reinforcement cir-cle thickness, the results showed that the grouting reinforcement could effectively reduce the surrounding rock loose pressure, delay initial sup- port time, reduce the support structure load bear ratio, through the relationship of surrounding rock anti stress release rate and grouting circle thickness could get the best grouting range.