TN715 : Investigating the type of rock behavior in the estimation of stress by Deformation Rate Analysis Method
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2017
Authors:
Abdollatif Aghill [Author], Majid Nikkhah[Supervisor], Shokrollah Zare[Advisor]
Abstarct: Stress is a fundamental concept in the principles of rock mechanics and applied applications in rock engineering. Understanding the stress in building design Most engineering projects that are related to drilling in stone are very important. The best methods for measuring (estimating) stress are direct measurement methods, but these methods are proven to be very expensive and cost-effective, and these methods are ineffective in many depths and regions of out of access. Hence, today, indirect methods (baxsed on rock core samples) are expanding to estimate past stresses. One of these methods is the methods baxsed on the phenomenon of memory stresses of acoustic emission rock and the deformation rate analysis. In this research, the deformation rate analysis method was used for conducting experiments. The stress-strain behavior curves of a rock to the failure stage include crack closure, linear elasticity and Plastic areas, and, accordingly, pre-loading stresses have been designed. In order to investigate the rock behavior in stress recovery in each of the above three areas and at different preload levels for different rocks, especially granite, zeolite, sandstone and gypsum, DRA experiments were conducted. The results show that in each rock, different behaviors occur in each of the above three areas. It is also shown that for different rocks the values of recovered preload stresses by DRA vary in each region, and in general, the best recovery of stress for zeolite and granite rocks and the weakest one for gypsum rock has occurred.
Keywords:
#indirect method #rock memory #preload loading stress #DRA method #stress recovery Link
Keeping place: Central Library of Shahrood University
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