埋置深度embedment depth; depth of tunnel 覆盖厚度overburden of tunnel; covering depth 隧道建筑限界tunnel structure gauge; clearance fro traffic tunnel ..
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The Overburden of tunnel construction is increasing recently. Rocks in the depths have high strength and high stress condition.
隧道工程开挖深度有逐渐增加的趋势，深部岩石具高强度及高应力环境。
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。
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