The opportunities offered by rock mechanics as a science are not fully and efficiently applied in the design and assessment of underground constructions performed in salt massifs, especially in the efficient design and long-term lifetime of the geometrical elements that characterize the exploitation method with rooms and pillars. It can be asserted that such a conventional limitation of the possibilities of rock mechanics, is due to some gaps, the lack of a fundamental theoreticalexperimental theory regarding the three-dimensional behavior of the rock mass. Methods. The mechanical behavior of the salt was studied under triaxial conditions. The conventional triaxial method was supplemented with a three-dimensional analysis - of salt massif and of rooms and pillars exploitation complex by cubic triaxiality. The deformation behavior of the salt was studied through the assessment of both cylindrical triaxial and cubic triaxial. Findings. Analytically, based on the cubic triaxial experiments according to the octahedral concept, deformation and rheological properties of salt, results that a salt massif can be characterized in terms of the natural stress state value, by three types of zones: stable, transition and unstable. Originality. Based on the octahedral geomechanical parameters, an analytical model for the characterization of salt massifs has been proposed, a model that has been verified both by laboratory research by the instrumentality of modelling and also by in situ measurements. In this context, it resulted that for the analyzed salt with the highest resistance, the octahedral strength does not exceed 5.6 MPa and, therefore, it is dangerous to use in the salt mines field design values of 2 to 5 times higher than the real value. Practical implications. The determination of stressdeformation natural state is related to the highlighting of the contour or limits of the zones situated in a certain state (in triaxial context) with the consideration of the determinative anisotropy, namely, of strength and deformation anisotropy, as well as of the rheological behavior of in situ salt.
The paper explores the industrial tourism development potential of a former mining area in Petrila, Jiu Valley, Romania, drastically affected by deindustrialization, in order to build a theme park in the old mine site. The research context is determined by the current economic and social state of the area, and also by the potential of the identified industrial heritage elements. For this reason, there was developed an optimal selection algorithm, based on multi-criteria analysis and Greedy approach. This optimal selection algorithm blends the objectivity of the technical-economic studies and the subjectivity of the residents’ perceptions of community satisfaction. After carrying out the Petrila case study, the results of the proposed algorithm application concerning the destination, from the point of view of their use, of each existing building in the Petrila site was determined. Compared with other studies, ours considers different criteria and can always be reapplied to validate or refine the selection based on new emerging inputs.
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