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近年许多冻结井筒在施工期间发生了外层井壁破坏，不仅影响了井筒的正常施工，而且造成了很大的经济损失。对冻结井筒施工期间外层井壁的破坏特征及原因进行了分析，并提出了外层井壁破坏的防治措施。
In recent years, many frozen boreholes have undergone outer wall damage during construction, which not only affects normal wellbore construction, but also causes great economic losses. The damage characteristics and reasons of the outer shaft wall during the construction of the frozen wellbore are analyzed, and the prevention and treatment measures of the outer shaft wall damage are proposed.