Continuous arch bridge dismantling method based on shallow-buried foundation critical cross-sectional area overturning damage

The invention relates to the technical field of shallow-buried foundation continuous arch bridge dismantling, in particular to a shallow-buried foundation critical cross-sectional area overturning damage-based continuous arch bridge dismantling method, which is characterized by comprising the following steps of: 1, calculating a foundation overturning damage critical cross-sectional area Acr; 2, soil around the continuous arch bridge foundation is excavated out, a foundation base is exposed out of the ground, then the foundation is symmetrically dismantled, and the effective area of the remaining foundation section is smaller than the foundation overturning damage critical section area Acr; and 3, collapsing the first span structure of the side span of the continuous arch bridge so as to cause continuous collapse of the whole continuous arch bridge. The method has the advantages of being high in safety degree, rapid in dismantling, high in working efficiency and the like, meanwhile, the construction period ca