The measured contact force is roughly in a same level under different geological conditions, so it is possible to reduce the thickness of secondary lining as well as reinforcement.
由于二衬在初支稳定后施作，不同围岩级别条件下，初支、二衬间的接触压力的大小大致相仿。
However, the thickness or the need for reinforcement of view to the secondary lining is very different.
但对于二次衬砌的厚度、是否需要配筋的看法则有很大的不同。
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