«Belgorkhimprom» JSC (Minsk, Republic of Belarus):

Novokshonov V. N., Senior Researcher, Candidate of Engineering Sciences, e-mail: novokshonov@tut.by

Danilova A. F., Head of Laboratory of Researches of Rocks and Geoecology Movement Processes, e-mail: anjelika-sol@tut.by

Deshkovskiy V. N.,Leading Researcher, Candidate of Engineering Sciences, e-mail: glanigo@tut.ru

«Belaruskali» JSC (Soligorsk, Republic of Belarus):

Zeytts V. E., Chief Mine Surveyor, e-mail: zv@kali.by

Specification of mechanism of formation and development of water supply fissures in surface and in time became possible due to the many-year and labor-consuming field survey (from specially prepared excavations) of the process of development of anthropogenic fracturing in rock massif of Starobinsky potassium salts deposit, underworked by stoping. On the basis of this availability, the forecasts and preventions of mine flood threat became also possible. During several tens of years, specialized scientific-research organizations (B. E. Vedeneev All-Russian Scientific-Research Institute of Hydrotechnics, «Belgorkhimprom» JSC, Belorusian State University), together with subsoil user («Belaruskali» JSC) have been carrying out the full scale research of anthropogenic fissuring of underworked rock massif on mathematical models of Starobinsky deposit. The most significant results of researches were obtained in conditions of usage of panel systems of development of potassium layers. During the full caving strata control in storing face, the process of movement of underworked massif is carried out with big rates for relatively short period of time. The main purpose of research was the study of fissures-formation and development of water supply canals in underworked rock massif in various areas of movement molds:
-first is the area of increased bearing pressure (beyond the pillar);
-second is the unloading area of pressures directly beyond the worked out surface.
Creation of packs along the boundary entries of walls in worked out space is recommended for decreasing of the height of water supply fissures' spreading area (in the conditions of restricted power of waterproof mass). These boundary entries decrease the workable width artificially, which provides the smooth roof deflection and lower shift of separate layers. Therefore, minimization of height of spreading of water supply canals (anthropogenic fissures) is also provided.

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