Technogenous karst in hydrotechnical building: Fid-Bau Portal

Technogenous karst in hydrotechnical building

Ivanov, B. N.

Summary Analysis of much information about negative karst influence upon hydrotechnical buildings shows that the main cause of activation of solution processes in karstified carbonate and sulphate rocks, karst-suffosion and deep-erosional washing of released zones of jointing and joint-hollowed systems is the dislocation of the natural-historical conditions of karst development under new technogeneous situations. It is necessary to note that the surplus flooding of sections of river valleys developed for reservoirs, irrigation canals and other buildings in comparison with previous existing natural conditions determines the origin of collapsed deformations in the foundations and abutments of dams, in the bottoms of new water areas and in the areas of the Earth's surface adjacent to them. The latter belong to subsurface reservoirs, draining the new systems of the surplus surface flood waters. Such displays of the technogeneous karst destroy hydrotechnical buildings. In order to prevent destruction it is necessary to carry out in the karst regions complex engineering-karstological investigations on a level with regime observations on the interconnections of surface and fracture-karstic waters. The results of such works give possibilities of forecasting the reconstruction of natural-historical situations of karst formations in their technogeneous development. Such forecasts allow appreciation of the stability of the foundations of different constructions under conditions of dislocated hydrogeological and engineering-karstological regime of the karst process and to prevent sudden manifestations of technogeneous karst formation by application of well-founded measures in antikarst protection.