INDICATORS FOR THE PRESENCE OF LOCAL FILTRATION STABILITY DISTURBANCES IN THE MADE GROUND HYDROTECHNICAL FACILITY BODY

Abstract

The article is devoted to the development of an indicator system for local filtration disturbances presence in a made ground hydrotechnical facility body. The relevance of the theme is determined by a fact that leakages caused by such disturbances result in 31% of accidents at ground hydrotechnical facilities in the world.
The formation mechanism of suffusion removal traces on the shelves’ surface and at the foundation of a facility is shown. Detection of the suffusion removal traces is complicated by the fact that in most cases the removal occurs at the facility basis and is accompanied by redistribution of the removed particles over a considerable area, sedimentation on the basin buttom and tail-water or masking of the removals with rocky banquets or cantledges. In this regard, the detection of suffusion removal is more likely on the shelves’ surface, where the removal occurs periodically because of seasonal changes in the level and hydraulic pressure waters.
The study consider formation mechanism of local subsidence of a facility’s surface resulting from suffusion removal of the facility’s particles at sites of local disturbances of filtration stability. The paper describes concentrated filtered water outflows
at the facilities foundation or separate benches that are formed as a result of filtered water redistribution in a ground hydrotechnical facility body, resulting from local disturbances in filtration stability.
The paper illustrates an origin mechanism and examples of water flowing at the hydrotechnical facility foundation. The water flowing is a sign of the hydraulic pressure of an enclosed water reservoir, which is transmitted to the facility foundation through filtration paths. The authors describe a mechanism of local uplifts of a ground hydrotechnical facility’s surface and present examples of such uplifts. Difficulties in the detection of this
indicator are described, which can be connected with the fact that in the area of a local uplift specialists often observe the subsequent subsidence of the shelf’s surface, which occurs as a result of suffusion removal of facility’s particles or the fall of hydraulic and pore pressure.
The received indicators allow to develope an inspection algorithm for a made ground hydrotechnical facility, intended on search and detection of local filtration stability disturbances and filtration paths.