Abstract
This work was developed from a theoretical and experimental study on the stability analysis of underground workings located in strongly metamorphosed andesite and determination of mine pressure in the context of rock – support system interaction. We thank to our colleague dr. Gabriel Babuţ for his assistance and support in developing the mathematical model based on the principle of proper conformity and safety level, according to the main factors that influence the stability of underground workings. We would also like to show our gratitude to the University of Petrosani which provided the necessary equipment to perform all laboratory tests in prior experimental researches leading to the results synthesized in this article.
Highlights
The research results will facilitate to improve stability of mine workings and to significantly increase the safety level throughout their entire life – cycle
The case of andesitic rocks strongly metamorphosed hydrothermally tensions occurs, which causes mine pressure for which directing the stress can only be achieved by creating opportunities for relaxation of the rock – support system, where after relaxation the tangential stresses are decreasing in value outline the work contour, their maximum moving at a distance equal to the radius of non-elastic area, decreasing towards the stress value in the undisturbed massif (Fig. 2)
Radial stress values on the contour can not be considered null; there is highlighted a variation in their value with the cross-section of the mine working and with the depth of the location thereof, namely for an increase of these two parameters, radial tensions are increasing from the contour to the massif, reaching lower and lower values compared to the tension state in the massif, which explains the worsening of workings stability with increasing cross section and depth
Summary
Numerical – based finite element method was applied to obtain the stress variation radial displacement and mine pressure epures for the analyzed mine workings. To assess the stability of underground mine workings, a mathematical model was developed based on the principle of proper conformity and safety level, according to the main factors that influence the stability of underground workings. The results obtained showed that underground workings analyzed are characterized by a low stability level, which is consistent with the results obtained by the observations and numerical method. Depending on the computed level of safety has been established correspondence to class stability of underground mine workings. The results are confirmed by in situ observations and solutions obtained by experiments. The research results will facilitate to improve stability of mine workings and to significantly increase the safety level throughout their entire life – cycle
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