The Influence of the Exploitation of the XIV Horizon on the Stability of the Cantacuzino Mine - Slănic Prahova Saline

Abstract

Salina Slănic Prahova continued its activity, during the period 1993-219, through the exploitation of the Cantacuzino mine, with rooms and square pillars of 16 m x16 m and 18 m x 18 m, on 7 overstory levels, with a height of 16 m, during which 4 964 880 tonnes of rock salt were exploited. Over time, some ceilings between the levels, with a thickness of 8 m, began to crack, which required the monitoring of their movements through topographical methods. Although the exploitation of the Cantacuzino mine has ended, the last three levels are used for technical purposes. Therefore, the stability analysis of the resistance structures was imposed, under the conditions of mining with rooms and pillars of the XIV horizon, located at +145m elevation. Between the last horizon from the Cantacuzino Mine and the XIV horizon, a 40 m crown pillar was designed. Analysis of the state of stresses and strains, respectively of the influence of voids resulting from the extraction of horizon XIV on the Cantacuzino Mine was realized by numerical modeling with finite differences, in elasto-plasticity, using FLAC 3D software.