Gradient Method Applied to the Time-Dependent Behavior of Rocks | Chapter 1 | Research Highlights in Science and Technology Vol. 2

 Experimental research, two together in situ and engaged, allows obtaining the accruing effect of all determining determinants, without the feasibility of separating the effects of all. Due to this fact, in addition to because mining evolves in different geomechanical environments, specific for each deposit or even part of the deposit, the problem of guaranteeing the stability by judging the pressure manifestation reign has a local aspect. The results of these researches can be secondhand in order to: boost the existing support monographs, by selecting the optimal support density; base a correct support technology; authorize the appropriate difference between the discovering front and support front, etc.; design new types of support; assessment of the influence of the new sup-traffic technologies in the given geomechanical environments; optimization of upholding monographs that must be analyzed from the viewpoint of maximum satisfaction of the required environments on the work by allure role in the result process, throughout its life, with littlest execution, sustenance and exploitation expenses and in perfect environments of work safety. For this purpose, the calculation methods and equipment must devote effort to something determining: the shift of the surrounding rocks; the deformations of the subversive work profile; the displacements and deformations of the support system; and the loads on the support. Most questions related to excavating pressure and mining balance in the underground activity domain must be answered by considering moment of truth behavior of rocks through an approach of the interplay amidst the rock massif, group providing support to members, time through the adaptable, viscous, and plastic models, that is to say a rheological approach. To select a rational group providing support to members, one must see the sustainment solicitation at differing time pauses. Only in analytical research, place the massif is studied and typified in terms of rheological nature, is the change in sustainment accompanying highlighted. The gradient system used in this place case is based on the evolution of the definitive deformations at a given show up comparison to their premature evolution. The paper is divided into two portions: experimental and understanding of experimental dossier, which demonstrate me's methodology for determining the rheological behavior of resolved andesite as a result of theoretical and exploratory research on the analyzed rock types.  Based on the deformity and the time curve of the level mining work contour, the analytical function was established, that expresses the law of wanted deformation. At the same time, the rheological model worthy describing the practice under a load and under extremely adverse environments is proposed.

Author(s) Details:

Mihaela Toderas,
Mining Engineering, Surveying and Civil Engineering Department, Faculty of Mines, University of Petrosani, 332006 Petrosani, Romania.

Please see the link here: https://stm.bookpi.org/RHST-V2/article/view/10606