本文研究充内压端封闭异厚度薄圆柱壳的极限分析问题。
The present paper is concerned with a problem of limit analysis of thin cylindrical shell with closed ends and different thicknesses under internal pressure.
油层具有发育层数多、 渗透率低、单层厚度薄等特点；
IV and front sandbar, the reservoirs have the characters of multiplayer. low permeability, small single layer thickness.
由于棚洞的埋深很浅，覆盖土厚度薄，地震时往往产生破坏。
As shed-tunnel often has low depth and thin surface cover, it's easier to be damaged in earthquake.
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