Calculation of pillars in underground dissolution of salt deposits

Abstract

At domestic brine fields deposits of rock salt of various thickness (from 40 to 700 m) and depth (from 300 to 1400 m) are developed by solution mining, through boreholes. As a rule, cylindrical caverns of 100 m diameter are used. The caverns are arranged on a 200x200 m grid, and the width of inter-cavern pillars is 100 m. Such sizes of pillars are insufficiently justified due to limited experience of solution mining and lack of tested solutions. As a result, there is a danger of pillars destruction and surface subsidence.

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