NUMERICAL ANALYSIS OF DESTRESSING TO MITIGATE THE SUDDEN COLLAPSE RISK OF STIFF LAYERS IN SOLUTION MINING

Date

2023-6-12

Author

Konuk, Cem Noyan

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Solution mining in thick deposits is a challenging practise of strata geomechanics. The stiff layers overlaying the production caverns can bear excessive loads and the strain energy may be relesead by a sudden collapse. The violent failure of the strata has serious consequences in terms of operational sustainability and safety. To mitigate the risk, destressing methods can be used to induce fracture networks on the stiff layers. This study employs a discontinuum based numerical code to investigate the alternative destressing schemes. Considering the operational practises and economy, the ribbon and borehole patterns were simulated for different configurations. Discrete Fracture Networks was used for implementation of the fractured region. While the ribbons were examined for various spacings between the fractured zones, the boreholes were studied with different patterns. A sample production on a single cavern was simulated on a staged manner and the strata mechanics were monitored with history points. Comparing the model results, the most viable destressing scheme was determined for solution mining.

Subject Keywords

Solution Mining, Strata Control, Destressing

URI

https://hdl.handle.net/11511/104345

Collections

Graduate School of Natural and Applied Sciences, Thesis