SUMMARY:

Simulation by electrical tank analogue based on the laws of elasticity, seems to be a good tool for analysis of underground structures in three-dimensions particularly in hard rock mines. This method is a combination of analytical approach based on model study of actual underground structures. This application has been used earlier mainly for the simulation of mine-design problems. The main instrument in this technique is either an electrical tank analogue or a resistance analogue. However, electrical tank analogue has been used in this, to study the stability of large underground excavations. From the design point of view, the technique seems quite suitable particularly in hard rocks, where the rocks behave more or less under elastic conditions. It is thus believed that the technique can be very well used in the design of underground caverns that can be used for the storage Of oil, gas etc.

ZUSAMMENFASSUNG:

Eine Möglichkeit zur dreidimensionalen Berechnung von unterirdischen Bauwerken, insbesondere solchen in hartem Gestein, bietet aufbauend auf den Elastizitats gesetzen, die Elektro- analogon-Methode. Diese Methode ist eine Kombination von analytischen Naherungen, die auf Modellstudien unterirdischer Anlagen basieren. Diese Methode hat frueher hauptsachlich Anwendung bei der Simulation von Untertageentwuerfen gefunden. Das Hauptinstrument bei dieser Technik ist entweder ein potentialanalogon oder ein Widerstandsanalogon. In der vorliegenden Untersuchung wurde die Elektroanqlogon-Methode angewendet, urn die stabilitat grosser unterirdischer Hohlraume zu untersuchen. Die beschriebene Elektroanalogon- Methode bietet insbesondere in hartem Gestein mit mehr oder weniger elastischem Verhalten eine brauchbare Entwurfsgrundlage. So wird daher angenommen, dass sich diese Methode auch fuer den Bau von Kavernen als Öloder Gaslager gut eignet.

RESUME:

La simulation par la method electro-analogique basee sur les lois de l''elasticite semble etre un bon instrument de calcul tridimensionnel des structures souterraines, particulierement dans le cas des roches dures. Cette methode est une combinaison d''approches analytiques appuyees sur des etudes modeles des structures souterraines actuelles. Cette methode a ete utilisee autrefois, principalement dans la simulation des projets de constructions souterraines. L''instrument principal de cette technique est ou bien une analogie potentielle ou bien une analogie de resistance. Cependant, pour analyser la stabilite des grandes cavites souterraines, la methode d''electro-analogie a ete employee dans cette etude. Du point de vue de dimensionnement, la technique parait etre tout a fait adequate, particulierement dans les roches dures ayant un comportement plus ou moins elastique. Aussi est il admis que cette methode convient tres bien au dimensionnement des cavernes souterraines destinees au stockage de petrole et de gaz.

INTROOOCTION

Stress in rock mass plays a significant role in the stability of under-ground excavations. Therefore the knowledge of the distribution and concentration of these stresses on pillars in underground and on supports which form significant parts of the mine structures is of major importance. These stress concentrations on the pillar vary with the amount of load coming on the pillar due to progressive mining. For safe and stable structure, it therefore, becomes necessary to study the strength and distribution of pillar supports.

The failure of rock pillar support in mine takes place due to increase in the average maximum stress over the pillar. This increase in pillar s tress causes displacement which is a function of average stress to a large extent than that of stress concentration. It has been observed that the displacement of a pillar has a close relation with the stability of the pillar.

Simulation by electrolytic tank analogue based on the laws of elasticity, seems to be a good tool for three-dimensional analysis of underground structures, particularly in hard rock mass (Dhar 1970; Patel 197:5; Behra H177).

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