The brief review of modern technologies of a waterproofing of underground constructions is submitted. Results of own development in this area, in particular, a waterproofing of underground constructions with internal metal isolation are stated; arrangement of deformation seams at construction of underground complex hydroelectric power station. Experience of works on restoration waterproofing in tunnels and ventilating shafts on objects of Petersburg underground, road tunnels etc.
The delamination of layered chamber roofs significantly reduces the bending stiffness of the layers, which leads to a significant increase in the deflections of the lower layers of the roof and the formation of limit zones.
