在分析竖向附加力的产生及当前关于该力的确定方法的基础上 ,指出了由于问题十分复杂 ,要在短时期内准确确定附加力的分布与大小是十分困难的 ,就实际需要而言 ,只需确定附加力的均值和极限值即可。根据土层与井壁共同作用原理 ,提出了关于作用在滑动可缩和整体可缩新型井壁结构上的竖向附加力的确定方法。 On the basis of analyzing the generation of vertical additional force and the current determination of the force, it is pointed out that it is very difficult to accurately determine the distribution and size of additional force in a short period of time due to the complexity of the problem. As far as practical, , Just to determine the additional force of the average and limit values ​​can be. According to the principle of interaction between soil layer and borehole wall, a method to determine the vertical additional force acting on the sliding retractable and integral retractable shaft lining structure is proposed.