Grouting has been widely employed to mitigate geohazards in underground projects (e.g., the tunnel). However, few studies have focused on the effects of the creep behavior of a grouting-reinforced body on the stability of tunnel operation. In this study, the curtain grouting-reinforced Nanshibi tunnel was adopted as an example to explore this issue. More specifically, uniaxial compressive creep tests were firstly performed to study the time-dependent behavior (i.e., the creep behavior) of the grouted specimen. Then, the improved nonlinear Burgers model was proposed to characterize the observed creep behavior of the grouted specimen. Finally, a numerical simulation of the tunnel operation post grouting was conducted using the newly-proposed nonlinear Burgers model. The following results were obtained: (1) The creep behavior of the grouted specimen under different loadings undergoes three stages: decaying creep, steady creep, and accelerated creep. The steady creep rate is attributed to the homogeneity of the grouting-reinforced body. (2) The nonlinear Burgers model can reasonably quantify the creep behavior of the grouting-reinforced body. (3) The creep behavior of the grouting circle of the tunnel has a significant influence on the tunnel deformation and thus the lining safety. More specifically, the tunnel deformation exhibits nonlinear growth and mainly occurs at the vault and inverted arch. Furthermore, owing to the shape of the lining structure, the arch spring is most vulnerable to cracking under the eccentric tension state. The improved creep model is proved to more accurately predict the structural deformation of a curtain grouting-reinforced tunnel. As such, it can help devise grouted-tunnel maintenance strategies for long-term safety.

灌浆已被广泛用于减轻地下工程（例如隧道）中的地质灾害。然而，很少有研究关注注浆加筋体的蠕变行为对隧道运行稳定性的影响。本研究以帷幕注浆加固的南石壁隧道为例对此问题进行了探讨。更具体地说，首先进行单轴压缩蠕变试验以研究灌浆试样的时间相关行为（即蠕变行为）。然后，提出了改进的非线性 Burgers 模型来表征观察到的灌浆试件的蠕变行为。最后，利用新提出的非线性Burgers模型对隧道施工注浆后的数值进行了数值模拟。获得了以下结果：(1)灌浆试件在不同荷载作用下的蠕变行为经历衰减蠕变、稳定蠕变和加速蠕变三个阶段。稳定的蠕变速率归因于灌浆增强体的均匀性。(2)非线性Burgers模型可以合理量化注浆加筋体的蠕变行为。(3) 隧道灌浆圈的蠕变行为对隧道变形及衬砌安全有重要影响。具体而言，隧道变形呈现非线性增长，主要发生在拱顶和倒拱处。此外，由于衬里结构的形状，拱形弹簧在偏心受拉状态下最容易开裂。改进后的蠕变模型被证明可以更准确地预测帷幕注浆加固隧道的结构变形。因此，它可以帮助设计灌浆隧道维护策略以实现长期安全。