ABSTRACT:

Complication of mining and geological conditions of the deposits under development causes difficulties in creating mathematical models. One of the possible ways of solving the problem is-complex approach, integrating full-scale investigations with modeling. As a result the authors succeeded in working out numerical simulation technique, which allows to overcome traditional difficulties.

RESUME:

La complication des mines et des conditions geologiques cause des difficultes en creant un modele mathematique. Une possibilite de resondre ce probleme et l"approche complexe, integrant des recherches à l"echelle entire avecx le modele. Comme resultat, l"auteur reussit à developper une technique de simulation numerique, qui Ie rend possible de surmonter les difficultes traditionelles.

ZUSAMMENFASSUNG:

Die Kompliziertheit des Bergbaus und der geologischen Bedingungen erschwert das Erstellen mathematischer Modelle. Eine Möglichkeit der problemlösung ist der komplexe Weg, der Untersuchungen im vollen Maßstab mit denen am Modell kombiniert. Als Ergebnis gelang dem Autor die. Erstellung einer numerischen Simulationstechnik, die eine Überwindung der herkömmlichen Schwierigkeiten ermöglicht.

The development of building of different, purpose underground structures occurs as a rule by means of increasing the depth of stowage and the dimensions of. their structural elements, involving in building massifs with more complicated engineering- and hydrogeological conditions. This results in that geomechanical processes acquire new special features, not always calculable using traditional analysis technique The problem of developing and evaluating new, rather simple and reliable forecast procedures, hasn"t been finally solved despite its particular complexity and great scientific and practical significance.

The reliable solution of the problems connected with the effective and safe mining practice and operation of underground structures de- pends greatly on reliable, full and high-quality initial information. about massif condition and conduct. The, latter concerns as well the quality of setting problems, which depends on the extent of investigation of geomechanical, processes.

The complete description of geomechanical processes in the actual rock massifs leads to the very complicated mathematical problem formulations, which include allowance for heterogenity, anisotropy, inner fractures as well as boundary conditions. It is unlikely to be possible to get analytical solution of the problem under existing con- ditions. Contradictions between the requirements of simplicity and adequate description of geomechanical processes may be eliminated by means of comprehensive investigations.

They provide for carring out scientific experiments in order to substantiate and select problem structural- model and further, forecast geomechanical processes based on extrapolation of the experiment results by comparing them with the results of numerical simulation. At the, same time error evaluation of possible and desirable simplification of actual rock massif model is essential in evaluating forecast accuracy.

A number of problems on selecting rational parameters of stopes, developing protective shaft pillars with room-and-horizon mining system and, defining -rock displacement parameters with deep water level lowering of the flooded rock, which covers economic minerals. Numerical simulation has been carried out on the finite-element basis.

Thick deposit of low jointed ferruginous nonoxidized quartzites of the Kursk Magnetic Anomaly being developed by room method is arranged for one of the anticlinal fold wings of the larger folded structure. From the top the deposit is covered by thick layer of watery rocks.

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