An investigation into cracks development with use of energy method

• Autores: Abbas Majdi, Soroush Ali Madadi, Mohammadhossein Khosravi
• Localización: QUID: Investigación, Ciencia y Tecnología, ISSN-e 2462-9006, ISSN 1692-343X, Nº. Extra 1, 2017, págs. 2307-2319
• Idioma: inglés
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• Resumen

  • Since the process of initiation and propagation of cracks in the rock is under focus nowadays. Using the fundamentals of fracture mechanics and its relationship with the injection pressure can be a suitable tool for examining and studying the behavior of rock masses more exactly and in certain cases, estimating the in-situ stresses in different depths of the earth. Knowing and evaluating the behavior of rock joints under the injection pressure in rock mechanics projects are of high importance. The material resistance may include surface energy, plastic work or other energy losses during the crack growth. Therefore, the necessity of knowing the initiation mechanism and the way of hydraulic cracks propagation in various branches of engineering has caused the analysis of this phenomenon and trying to obtain a suitable model for its simulation be considered strongly. In this article, we have tried to offer a simple and efficient model for calculating the crack growth process in rock environment by employing sophisticated analysis methods. Then, the ground model along with fluid injection is known using ABAQUS software and employing finite element method. For progression of the research, at first, Kirsch relations were used for verification of the way of stresses distribution around the well. The resulted acceptable error shows the proper consistency of numerical results with the analytical relations. Then, the results obtained from the two methods were compared for examining the accuracy of the extracted analytical relations after making sure of the simulation results. The comparison showed that the numerical results obtained from the simulation have an acceptable consistency with the analytical relations. Finally, the effect of injection pressure and other effective parameters have been examined.