为了定量研究超深圆形基坑地下连续墙支护结构体系的受力和变形机理，通过Midas GTS建立超深圆形基坑施作过程的精细化有限元模型，通过改变地下连续墙局部弱化程度、地下连续墙先行幅和后续幅数量和嵌固深度等参数，对围护结构受力、变形和基坑周边地表沉降等规律进行了分析，分析结果显示：本工程的围护结构设计具有一定的优化空间；围护结构的水平最大变形和最大应力集中于第8 ~ 10道环梁处；围护结构的变形随幅间弱化程度和幅数的增加而增加，围护结构应力随幅间弱化程度和幅数增加而减小；基坑周边地表沉降随幅间弱化程度和幅数的增加而增加。分析结果对类似超深圆形基坑的设计和施工具有一定的借鉴意义。

In order to quantitatively study the stress and deformation mechanism of ultra-deep circular foundation pit, the finite element models of the operation process of ultra-deep circular foundation pit were established through Midas GTS. The stress and deformation of the enclosure structure and the surface settlement around the foundation pit were discussed and analyzed by altering the local weakening degree of the underground diaphragm wall, the number of the first and subsequent amplitudes of the underground diaphragm wall, the embedment depth, the inner diameter of the foundation pit, and other parameters. The analysis results show as follows. The design of the envelope structure of this project has a certain optimization space. The 8th ~ 10th ring beam is where the maximum horizontal deformation and stress of the envelope structure are concentrated. With the increase of the degree and number of amplitudes weakening, the enclosure structure experiences an increase in deformation, and a decrease in stress. Similarly, the surface settlement around the foundation pit also increases with the increase of the degree of inter-amplitude weakening and amplitude number. The analysis results provide valuable references for the design and construction of similar ultra-deep circular foundation pits.