MECHANISMS OF NEGATIVE INFLUENCE OF LOCAL FILTRATION STABILITY DISTURBANCES ON THE MADE GROUND HYDROTECHNICAL FACILITIES RELIABILITY

Abstract

The local disturbances of filtration stability and filtration paths have a significant impact on the stability of ground hydrotechnical facilities, where accidents lead to the entire cessation of mining enterprise activity, as well as to significant economic, environmental and social damage. Local leakages are a cause of 31% of accidents on hydrotechnical facilities. In this regard, the article considers the negative impact mechanisms of such disturbances on the reliability of made ground hydrotechnical facilities.

A local disturbance in filtration stability leads to a suffosion removal of facility material. As a result, in a hydrotechnical facility body cavities are formed, which reach critical dimensions and lead to destruction of an entire facility or its several parts. Local disturbances also lead to redistribution of water filtering in a facility body, which is characterized by the depression curve position. As a result of redistribution, the depression curve changes unpredictably. This has a significant effect on the geometry of the slip curve and the ratio of the holding and shearing forces acting for the curve given.

As a result, such redistribution leads to a disruption in the balance of forces and destruction of individual elements or the entire facility. In addition to influencing filtered water, a filtration path is also a structural heterogeneity in the body of the hydrotechnical facility. In this regard, it has a significant impact on the stability of facility elements, which it undercuts. In addition, the filtration path impacts on the stability of a facility as it is a canal for transferring the hydrostatic pressure from an enclosed pond to the facility foundation.
As a result, there is a force acting on the hydrotechnical facility near its foundation and vertically directed. This force can lead to the destruction of the facility or some its elements. Particularly dangerous are cases of application of any anti-filtration protection methods at the foundation of the construction, becouse in this case the hydraulic pressure concentrates in small parts of the hydrotechnical facility foundation. This mechanism impacts on the stability of a facility and also makes it dangerous to use many anti-filtration protection methods for a hydrotechnical facility