Finite element method applied in mine pressure computation within the context of rock massif – support system interaction

Toderaş, Mihaela; Moraru, Roland Iosif; Danciu, Ciprian

doi:10.33271/mining13.01.039

Cited by 1 publication

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“…From a theoretical point of view, the difficulty consists in the fact that in assessment of this natural state, the presence of two types of areas must be taken into account: (1) the area (or zone) where the salt rock is to the limit of stressdeformation state; (2) the area where such stressdeformation state is not reached and the salt rock has a reserve of strength (resilience). The appearance and manifestation of these stresses is partly due to the variation, size, shape and orientation of the constituent grain of the polycrystalline salt medium.…”

Section: Figure 9 Salt Samples Used To Determine the Strength And Deformation Characteristics And To Study The Rheological Behaviormentioning

confidence: 99%

The octahedral concept and cubic triaxiality in assessment of secondary stress state

Toderaş¹

2020

Min. miner. depos.

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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.

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Section: Figure 9 Salt Samples Used To Determine the Strength And Deformation Characteristics And To Study The Rheological Behaviormentioning

confidence: 99%

The octahedral concept and cubic triaxiality in assessment of secondary stress state

Toderaş¹

2020

Min. miner. depos.

View full text Add to dashboard Cite

show abstract

Finite element method applied in mine pressure computation within the context of rock massif – support system interaction

Cited by 1 publication

References 5 publications

The octahedral concept and cubic triaxiality in assessment of secondary stress state

The octahedral concept and cubic triaxiality in assessment of secondary stress state

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