ASSESSMENT OF RELIABILITY AND RISK DEGREE FOR ACCIDENT INITIATION AT SLIME STORAGES OF 4th MINING ADMINISTRATION, JSC “BELARUSKALI”

Definition of reliability for dams of slime storage embankment is given on the basis of reliability theory and characteristics of reliability and their analysis are presented in the paper. The paper specifies qualitative indices for earth dams which are subdivided in two groups: applicability factors and structural reliability factors. A short analysis of all possible causes for accident initiation at earth dams has been made and the analysis has permitted to pinpoint eleven main objects for diagnosis for slime storage dams. In order to assess risk degree of accident initiation at JSC “Belaruskali” slime storages all possible causes of emergency cases and their probability of occurrence have been analyzed in the paper. The paper acknowledges the fact that dam malfunction is possible, as a rule, due to violation of operational rules and regulations. Main parameters of slime storage state which are to be controlled regularly in the process of its operation have been noted in the paper. Observation results over slime storages, calculations of dam slope stability for normal operation (a principal calculation case) and operating irregularities in water seals (a special calculation case). As a stability margin factor is close to 1.0 for a special calculation case, an extreme position of depression curve has been determined for all design sections. It has been recommended to carry out a constant control over its position, and in the case when it reaches its peak value it is necessary to undertake appropriate measures in order to reduce its value. Final expert estimations on probability of accident initiation at the investigated slime storage dams of the 4th Mining Administration, JSC “Belaruskali” have been prepared on the basis of the analysis comprising all the required factors. A conclusion has been made about low risk degree of their destruction.

1. State Standard 27.002–89. Industrial Product Dependability. Basic Concepts. Terms and Definitions. Moscow, Publishing House of Standards, 1990. 37 (in Russian).

2. Golinkevich T. A. (1985) Applied Reliability Theory. Moscow, Vysshaya Shkola. 168 (in Russian).

3. Mirtskhulava Ts. E. (1974) Reliability of Hydro-Reclamation Facilities. Moscow, Kolos. 279 (in Russian).

4. Malakhanov V. V. (1990) Technical Diagnostics of Earth Dams. Moscow, Energoatomizdat. 120 (in Russian).

5. Nichiporovich A. A. (1973) Dams Built on the Basis of Local Materials. Moscow, Stroyizdat. 320 (in Russian).

6. Gogoberidze M. I. (1980) Scientific Basis for Field Studies of Dams. Tbilisi: Publishing House “Metsniereba”. 70 (in Russian).

7. Gogoberidze M. I., Kakauridze R. G., Mikashvili Iu. N., Mirtskhulava D. Ts. (1977) Compilation of Analysis Data on Breakdowns and Malfunctions in Respect of Dam Reliability. Soobshcheniia Akademii Nauk Gruzinskoi SSR [Report of Academy of Sciences of Georgian Soviet Socialist Republic], 86 (3), 681–684 (in Russian).

8. Schuitter N. (1976) Statistische Sicherheit der Talsperren. Wasser, Enerqia, Laft, 68 (5).

9. Investigations on Sustainability of Earth Dams for the Following Object: “Reconstruction of Charts for 4 ??-Sludge Depository with Obtaining Additional Capacity”: Final Report. Minsk, 2005.

10. Investigations on Sustainability of Embankments on Weak Foundation for the Following Object: “Reconstruction of Charts for 4 ??-Sludge Depository with Obtaining Additional Capacity. 2nd Stage“: Final Report. Minsk, 2008.