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IN SITU STUDIES TO ESTIMATE THE STRESS STATE IN PILLARS, FROM SALT MINE PRAID
Abstract
Determining the stress around a mining excavation is a complex issue of Geomechanics and implicitly of the mining area. The evaluati on of stress state is essential, but very difficult to obtain, due to the interaction of the instrument ation with the rock massif. The measurement methods, together with the devices and the methods of processing and interpretation of data, ensure and create the possibility of knowing the degree of dependence between the measured effects in terms of time, and the factors causing them; according to this, we can establish on wh ich factors and in what way it can act, in order to eliminate or minimize the negative e ffects. According to the preliminary visual observations, the performed laboratory tests, the data obtained by physical modelling and in situ measurement results of deforma tion of the salt pillars from Praid, the necessity to assess the load of the pillars, namely the stress state was needed. Hydraulic method was chosen for measurement, for which the purpose and the measurement technique were designed. This paper show s the methodology of measurement the stress state in the pillars from the salt mine Praid, which is helped by a cylindrical pressure cell, installed in bore holes a nd an analysis model for stre ss – strain state into a salt pillar according to the results.
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