铁路隧道复合式衬砌结构的计算荷载，按有关资料建议取值存在主观操作差异，设计失之指导与规范。通过进一步分析隧道工程状态，认为应规范化区别各级围岩及其级内差异和支护强度，以体现不同围岩衬砌的受力差异和平衡同级衬砌受力水平，为合理确定结构荷载提供条件；综合新奥法和传统矿山法分析，衬砌结构“远期”都承受相当的围岩压力，经结构验算和实测压力分析比较，并参考公路隧道设计细则，确定铁路深埋隧道坍方荷载按现行公式计算，Ⅱ、Ⅲ级衬砌荷载为坍方荷载的40%; Ⅳ、Ⅴ级衬砌分别为50%和70%； Ⅱ、Ⅲ级单线衬砌可视为安全储备，当跨度增加时，应全面满足构造、工程类比和结构检算要求；各级围岩侧压力系数按规范沿用，可以此统筹当前设计。建议通过系统性实测统计分析和试验研究，为进一步完善结构设计方法提供条件。

Nowadays, the structural analysis method of railway tunnel in China is still an experiencedependent one, thus the subjective differences of correlative parameters (especially the loads for the models) applied are widely existed due to the operators. To minimize the influence from the differences, effective guidance and norms are required. In this further discussion of tunnel engineering situation, the loading status and relative supports are legitimately classified, not only based the rock classification but also differed by specific geological environments in the same rock classification. In this proposed method, the consideration for consistency and differentiation is well presented. A simple fact is clarified form comprehensive analysis between New Austrian Tunneling Method (NATM) and traditional mining method (MM) that loading on the lining is a longterm act. Through the comparison between the structure calculation and analysis of actual measurement, several conclusions are drawn: The collapse loads on deepburied tunnels of railway are determined by the current formula are turned out to be reasonable. The loads of Ⅱand Ⅲ levels lining structure are the collapse ones of 40%, and then the loads of Ⅳand Ⅴ levels lining structure are, respective, the collapse ones of 50% and 70%. The Ⅱand Ⅲ levels lining structure of single track tunnel is considered to be safety reserve. As the span increases, the construction, engineering analogy and structure calculation requirements should be satisfied. Meanwhile lateral pressure coefficients of all levels of surrounding rocks are used according to the specification. Through the systematic statistical analysis and experimental research,the conditions for further perfecting the structure design method are provided.