利用流变介质模型，分析软岩立并并壁与粘弹塑性围岩的相互作用。
The rheologic model has been used to analyze the interaction between shaft wall and viscoelasticviscoplastic surrounding rock in soft rock stratum.
综合考虑规范对立管强度的要求，防止发生压溃和屈曲扩展的要求及限制立管发生漂浮的要求三个条件，确定了满足条件的最小壁厚。
Considering the requirements of riser strength, system collapse, propagated buckling and limitation of floating, the smallest thickness that meets the requirements is determined.
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