为了研究特大断面隧道穿越断层破碎带时围岩稳定性及变形控制问题，依托桐梓隧道，以现场实测数据为依据，利用有限元软件分析长大隧道穿越断层破碎带时围岩变形规律，并基于正交试验对断层破碎带地质特征参数进行参数敏感性分析，此外，为提高隧道穿越断层破碎带施工安全性，还利用数值模拟分析不同厚度加固区对围岩变形控制效果。结果表明：断层破碎带内围岩扰动性大，收敛速度慢，且拱顶最大沉降和周边最大收敛都出现在断层破碎带中部，距离断层破碎带中心位置越近，变形量就越大。断层破碎带地质特征参数对围岩稳定性影响不同；对隧道拱顶、边墙位移的影响程度分别为：断层劣化程度>断层宽度>断层倾角>断层倾向、断层倾角>断层劣化程度>断层宽度>断层倾向。不同浆液扩散半径所对应形成的注浆加固区对破碎带围岩的位移控制效果不同，加固区厚度为2 m时最优。

In order to study the stability and deformation control of the surrounding rock when a very large cross-section deep-buried tunnel crosses a fault fracture zone, the Tongzi Tunnel was relied. Based on field measurement data, finite element software was used to analyze the deformation pattern of the surrounding rock as the long tunnel crossed the fault fracture zone. Furthermore, an orthogonal test was conducted on the geological characteristics of the fracture zone to perform a parameter sensitivity analysis. Additionally, in order to enhance the construction safety of the tunnel as it passes through the fault fracture zone, numerical simulation was employed to analyze the impact of deformation control on the surrounding rock with varying thicknesses of the reinforcement zone. The results reveal the following the surrounding rock within the fault zone is highly disturbed, with a slow convergence rate. The maximum settlement of the vault and the maximum convergence of the periphery occur in the middle of the fault zone, where deformation increases as the center of the fault zone is approached. The geological parameters of the fault fracture zone have differing impacts on the stability of the surrounding rocks. Specifically, their effects on the displacement of the tunnel arch and side wall are as follows: fault deterioration >fault width > fault dip > fault tendency, and fault dip > fault deterioration > fault width > fault tendency. Different slurry diffusion radii corresponds to varying effects on the displacement control of the surrounding rock within the fracture zone through the formation of the grouting reinforcement zone, optimally, the thickness of the reinforcement zone is determined to be 2 m.