Round dado space thickness calculation method based on implicit iteration criterion

The invention provides a circular retaining wall space thickness calculation method based on an implicit iteration criterion, and the method comprises the following steps: taking a sliding body around a retaining wall as an annular hollow cylinder, and considering the influence of the geometric dimension of the section of the retaining wall on the soil pressure and the influence of multiple layers of soil; establishing a calculation model of active soil pressure acting on the cylinder; according to the relation between the thickness of the retaining wall and the excavation radius of the pile foundation pit, the function relation between the circumferential stress of the retaining wall and the thickness of the retaining wall is established; assuming that the contribution of the circumferential steel bars to the circumferential resistance of the retaining wall is not considered, determining the circumferential strength of the retaining wall; and based on an implicit iteration criterion, performing iterative cal