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研究了深厚表土层中有竖直附加力存在时的特殊井壁结构形式，阐述了滑动可缩井壁结构各部分的受力特点和计算模型，提出了新的井壁设计方法，为工程设计和应用提供了可靠的依据
The special form of wellbore structure is studied when there is vertical additional force in the deep topsoil. The stress characteristics and calculation models of various parts of sliding shrinkable shaft structure are expounded. A new design method for wellbore wall is proposed. And application provides a reliable basis