针对现有隧道深浅埋界定方法存在的问题，结合现场测试和数值仿真结果，明确了应从围岩压力性质角度进行深浅埋界定。首次提出了以数值仿真技术为手段，利用拱上中心线土体侧压力系数变化规律为依据进行深浅埋界定的思路，并用2个工程实例进行了验证，新方法对土质隧道衬砌设计和施工有重大意义。

Directed against the demarcating problems of deep tunnel and shallow tunnel in exiting methods, the paper indicates the demarcating method from the viewpoint of characteristic of surrounding rock pressure according to the results of field observation and numerical simulation. By use of numerical simulation technique, the paper,for the first time, expounds the demarcating thought which is based on the changing law of soil lateral pressure coefficient in the centerline. The method is proved feasible by two engineering cases, and is of importantce to lining design and construction of soil tunnel.