Creep Behaviour of Alpine Salt Rock and the Influence of Insoluble Residues in Solution Mining

  • Pittino G
  • Golser J
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Abstract

In Austrian salt mining, brine is won by way of solution mining with the borehole well method. The Alpine salt rock (Haselgebirge) consists of a high share of insolubles, and therefore leached caverns are filled with clay residues, as so-called Laist, a natural backfill, according to the salt content. The creep deformations of the Haselgebirge mainly correspond with a rupture-free flow and are calculated by means of an elasto-viscous model (power-law). These deformations mobilize the passive fill-pressure in clay residue that is described as elastoplastic with isotropic hardening by means of a modified Cam-clay model. The long-term laboratory tests are supported through calculations of the creep parameter via measured convergences of drifts at various depths. The long-term behaviour of the caverns is evaluated based on numerical calculations by the volume convergence and the degree of utilization of pillar.

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Pittino, G., & Golser, J. (2004). Creep Behaviour of Alpine Salt Rock and the Influence of Insoluble Residues in Solution Mining (pp. 593–603). https://doi.org/10.1007/978-3-540-39918-6_66

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