ANALYSIS ON KEY STRATUM OF SALT SINGLE WELL SOLUTION CAVITY OVERLYING STRATA WITH ELASTIC THIN CIRCLE PLATE THEORY

This paper investigate the characteristics of salt single well solution mining, and analyzed the key stratum of salt single well solution mining cavity by the theory of elastic thin circle plate. This study provides theoretical basis for the key stratum theory applying to the moving law research of salt cavity overlying strata, and it is a new supplement research result of key stratum theory. This paper put the subsidence differential equation of salt solution mining cavity overlying strata, the stress and the first breaking distance calculation formula on the key stratum of cavity overlying strata, and analyzed the stress characteristics of the key stratum of cavity overlying strata. This paper also put the criterion equation which suitable for distinguishing the key stratum of salt single well solution mining cavity overlying strata. Finally, this paper proposed the key stratum theory in the application of the cavity overlying strata control for salt single well solution mining.