The calculation of structural load on the lining of tunnel with shallow overburden shows that the load on composite lining will be shared by primary support and secondary lining.
隧道衬砌在浅埋段的结构荷载计算表明，复合式衬砌中的初期支护和二次衬砌一般要共同承担荷载。
The primary support and the second lining of large-spanned tunnel have endured different surrounding rock stress because of the influence of structure and span of tunnel.
大拱隧道受结构和跨度的影响，其初期支护与二次衬砌各自承受不同的围岩压力。
Concept of limit displacements of primary support system of railway tunnel are presented, and the method for determining the limit displacements is introduced systematically.
阐述了隧道支护系统极限位移的意义，系统地介绍了初期支护极限位移的确定方法。
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