Geomechanical Assessment Model of Rocks Quality

Toderaş, Mihaela; Danciu, Ciprian

doi:10.9734/bpi/castr/v1/7847d

Cited by 3 publications

(9 citation statements)

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“…The correct dimensioning of rooms and pillars (safety pillars) presents a particular importance, both from the point of view of exploitation safety and the stability of the entire underground structure, the protection and rational exploitation of the deposit, but especially from the point of view of stability and protection of the day surface when measures are required to prevent the occurrence of surface land movements [1,2,3,4]. Ensuring the stability of underground voids created by the exploitation of salt in a solid way requires the achievement of complex studies in order to understand correctly the geo-mechanical characteristics, the micro-and macroscopic scale behaviour of salt, and rocks where the deposit is located [5,6,7,8,9]; of particular importance in this regard is the study of the dilatancy phenomenon and especially the involvement of the time factor in order to establish the rheological characteristics and parameters, by means of which the time of keeping the stability of the underground structures can be appreciated during the exploitation period but also after its completion [10,11,12,13,14].…”

Section: General Information and Statement Of The Problemmentioning

confidence: 99%

“…Otherwise, there is a potential possibility that at any time the fissures, fractures, or cracks appear and sometimes can trigger a partial or total collapse of the pillars. Regarding the rock salt from Romania, the limits of elasticity and plastic deformation were established at 10 MPa based on laboratory tests [4], [12], [15], with a mean value of 2.5 MPa. If the salt in the pillar is located in the field of plastic deformations, another important factor that we have already mentioned occurs, namely time factor; this one causes the development of deformations even if the external loads acting on the pillar remain constant.…”

Section: General Information and Statement Of The Problemmentioning

confidence: 99%

“…In fact, this phenomenon has been studied in a laboratory since 1992 by the author. The studies were performed on different kinds of salt, with the results proving that if the samples are loaded beyond the limit of elasticity and through the limit of plastic deformations, an increase in the time of the deformations of the samples takes place [4], [14], [15], [24]. This variation of the deformations is mostly accompanied by the phenomenon of salt dilatancy.…”

Section: General Information and Statement Of The Problemmentioning

confidence: 99%

“…Such a principle, which has been used successfully in the design of underground artificial supports (wood, metal, concrete, etc.) [4], [14], [24], [27], [28], can also be applied in the case of natural supports and also for the situation of salt exploitation by rooms and pillars. The possibility of its application is also facilitated by the advantages that numerical analysis methods provide today.…”

Section: Interaction Principle In the Assessment Of Pillars' Secondar...mentioning

confidence: 99%

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The Interaction Principle in the Assessment of Pillars’ Secondary Stress-Deformation State

Toderaș,

Iosif

2023

Mining Revue

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In the field of mining, one of the exploitation methods that is still the most used in rock salt, potassium, and magnesium salt deposits is the method with the room and abandoned pillar. The salt mining method with rooms and pillars represents a unique spatial system for which the establishment of an optimal correlation between the parameters of the room, pillar, and rock massif is required in any given situation. Thus, the dimensioning of the most requested element in the system is followed, and depending on its parameters, the other parameters of the system are established. Considering the exploitation method with rooms and pillars, the pillars are certainly the elements that are subjected to the greatest loads. In the situation where the deep exploitation of salt is done with square pillars, the evaluation of the optimal parameters of the elements of the exploitation system requires: establishing the loads that appear in the surrounding salt massif (the natural stress state); the qualitative-quantitative determination of the way of distribution of the secondary stress state in the pillars; evaluating the bearing capacity of the pillars; and establishing their geometric elements. Solving this problem can be achieved by different methods: based on the theory of limit equilibrium, taking into account the effective stress in the pillars; methods of the mechanics of the continuous system based on the analytical models for evaluating the secondary stress and deformation state of pillars and floors; and numerical methods combined with the results and measurements from the laboratory and in situ tests. A methodology based on the pillar–room–salt massif interaction principle was proposed for the analytically achievable stability exploitation system of rock salt by the dry method as the depth increased. Applying this method, the secondary stress-deformation state in the pillar can be established by taking into account the rheological behaviour of the salt, changing the pillar shape, and the extraction technology. The presented algorithm can be extended in the field of exploitation, where the room and pillar exploitation methods are used.

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Section: General Information and Statement Of The Problemmentioning

confidence: 99%

Section: General Information and Statement Of The Problemmentioning

confidence: 99%

Section: General Information and Statement Of The Problemmentioning

confidence: 99%

Section: Interaction Principle In the Assessment Of Pillars' Secondar...mentioning

confidence: 99%

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The Interaction Principle in the Assessment of Pillars’ Secondary Stress-Deformation State

Toderaș,

Iosif

2023

Mining Revue

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“…This mobilization can be achieved by controlling the deformations that occur in rocks. Shotcrete is an active support, involving the rock in the process of taking over the pressure that manifests itself on the contour [19]. The shotcrete is capable of filling cracks and allows for continuous support of the tunnel gallery.…”

Section: Sequential Excavation Methodsmentioning

confidence: 99%

Finite Element Method for Designing Large Section Underground Works by Sequential Excavation Method. Study Case: Lugoj-Deva Road Tunnel

Toderaş

2022

Mining Revue

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Any underground work requires the knowledge and application of appropriate techniques and technologies in all stages of implementation of such a project. An important problem in the design of underground works is the knowledge of the characteristics and behaviour of the massif in which the work will be carried out. It depends on the choice of the excavation solution appropriate to the existing real conditions, which will influence the duration of the work and the costs associated with it. The objective of this paper was to analyse and compare the total deformations of the contour of the underground work, assuming that the work is performed by sequential excavation method (S.E.M.): excavation in the horizontal direction and in the vertical direction. The finite element numerical simulation method was used for the convergence analysis, which showed that the total displacements of the tunnel gallery wall are smaller for the horizontal sequential excavation (SEM) variant, both for the hypothesis of coefficient of pressure in state of rest having the value K0 = 0.6, as well as for the hypothesis in which K0 = 2.27.

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Analysis of the possibilities of geometry of the Rosia Poieni mining field

Gusat

Bud²,

Mircea³

2021

MATEC Web Conf.

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This paper is made within the European project GoldenEye Nr. 869398 Type Horizon 2020 and aims at geometrization in 3D format of the Rosia Poieni deposit. This geometrization will be based on the information on the contents of the deposit, the economic analysis, and the calculations of the stability of the open pit and the adjacent industrial waste dumps. The analysis of data from the literature on content is in a very wide and insufficiently relevant range. The study will be based on the latest scanning technologies, AI, numerical simulations (FLAC 2D), which will form the basis of an economic analysis and forecast of metal prices in the future in order to identify exploitable limits both horizontally and vertically. Depending on the extension of the exploitation area and the definition of the deep exploitation limit by up-to-date exploitation, stability calculations will be performed, which will finally allow the geometry and safety of the deposit. Also, this geometrization will allow the decision-making of exploitation, extension, optimization by the management team and the administrative council of CUPRUMIN ABRUD S.A.

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Geomechanical Assessment Model of Rocks Quality

Cited by 3 publications

References 0 publications

The Interaction Principle in the Assessment of Pillars’ Secondary Stress-Deformation State

The Interaction Principle in the Assessment of Pillars’ Secondary Stress-Deformation State

Finite Element Method for Designing Large Section Underground Works by Sequential Excavation Method. Study Case: Lugoj-Deva Road Tunnel

Analysis of the possibilities of geometry of the Rosia Poieni mining field

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