Excessive deformation of tunnel lining structures can be identified as a common problem in Eastern China soft ground. Grouting treatment is an effective and common method to actively mitigate excessive cross-sectional deformation of tunnel lining rings in soft soils. However, grouting operations would introduce localized heavy disturbance to the surrounding ground around the grouting nozzles, causing large-deformational soil movement. The occurrence of large soil movement makes it difficult to use traditional finite element methodologies when it comes to modeling the effects of the grouting treatment on tunnel lining structures. To cope with this challenge, this paper proposes a simulation framework based on the Material Point Method, which enables explicit modeling of the grouting injection process and natural incorporation of large deformation. On the other hand, a field experimental study of an operational shield metro tunnel with grouting treatment has been conducted. The experimental study involved an extensive monitoring scheme and various geometrical arrangements of the grouting operation, thus the data from the field monitoring records enable a comprehensive comparison with the numerical results. The comparison between the experimental and numerically simulated results from the grouting treatment shows a satisfactory agreement. A sensitivity analysis of the grouting parameters is then carried out. The results from both the field experiment and numerical simulation show that with the increase of the height and volume of the grout, the recovery effect of the horizontal convergence is improved. However, limiting values of these grout parameters exist, beyond which any further increase would become less effective. The relative positions of the grouting to the tunnel, both horizontally and vertically, also show a sensitive effect.

隧道衬砌结构变形过大是华东地区软土地基普遍存在的问题。注浆处理是积极缓解软土隧道衬砌环截面过大变形的一种有效而常用的方法。然而，注浆作业会对注浆嘴周围的地面造成局部剧烈扰动，引起大变形土壤运动。在模拟灌浆处理对隧道衬砌结构的影响时，由于土壤大量移动，很难使用传统的有限元方法。为了应对这一挑战，本文提出了一种基于材料点法的模拟框架，该框架能够对注浆过程和大变形的自然结合进行显式建模。另一方面，进行了注浆处理的运营盾构地铁隧道的现场试验研究。实验研究涉及广泛的监测方案和灌浆操作的各种几何布置，因此来自现场监测记录的数据能够与数值结果进行全面比较。灌浆处理的实验和数值模拟结果之间的比较显示出令人满意的一致性。然后进行灌浆参数的敏感性分析。现场试验和数值模拟结果表明，随着灌浆高度和体积的增加，水平收敛的恢复效果提高。然而，存在这些灌浆参数的限制值，超过这个值，任何进一步的增加都会变得不那么有效。注浆与隧道的相对位置，无论是水平还是垂直，也表现出敏感效应。