Aiming at the shortcomings in the current theoretical calculation model of occluding piles equivalent to underground continuous walls, this paper considered the influence of the relative size of the pile diameter between the reinforced concrete piles and the plain concrete piles in the bored occluding piles and the stiffness reduction effect of the plain concrete piles. The corrected equivalent rigidity occluding pile force and deformation theoretical calculation model was derived. At the same time, relying on the occluding pile project of the main enclosure structure of the Taiziwan Station of Shenzhen Urban Rail Transit Line 12, the finite element software (Midas/GTS NX) was used to establish a numerical simulation test to analyze the force mechanism and the deformation law of the enclosure structure during the whole process of excavation of the foundation pit. The deformation law verifies the accuracy of the theoretical calculation model. The analysis results of the theoretical model and the numerical model were combined to point out the structural weaknesses in the bored occluding pile engineering example, and suitable measures were given. The research results show that with the excavation of the foundation pit, the maximum horizontal displacement of the enclosure structure finally converges to about 10 mm. Under the excavation conditions, the internal force and deformation of the enclosure structure increase rapidly, especially after the third layer of soil is excavated. The theoretical model in this paper can effectively predict the internal force and displacement development law of the bored occluding pile during the construction of the foundation pit, and then guide the rational design and safe construction of the enclosure structure.