An experimental study on the stress memory retrieval in rocks using deformation rate analysis method
الموضوعات :
Ablodllatif Aghill
1
(
Faculty of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran
)
Majid Nikkhah
2
(
Faculty of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran
)
الکلمات المفتاحية: strain, In-situ stress, DRA method, Stress memory, Rock,
ملخص المقالة :
Knowledge of the in situ stress state is an essential component in rock engineering, especially for underground spaces in civil, mining, petroleum geomechanics and geothermal energy projects. The most accurate methods of measuring the in situ stress of rock are direct and field measurement methods. However, since these methods are time-consuming and costly, indirect rock core-based methods have attracted specialists’ attention for estimating of rock stress memory. Methods based on the rock stress memory, including acoustic emission (AE) and deformation rate analysis (DRA), are among the common methods used for this purpose. In this study has been applied the DRA method to investigate rock type and its characteristic behavior in stress retrieval at different stress levels. To this end, four types of rocks (i.e., granite, zeolite, sandstone, and gypsum) with different behaviors and characteristics were used. The results show that the stress memory retrieval values in the elastic behavior region had better recognizable and higher felicity ratio (FR) for all types of rocks studied. Based on the results obtained from DRA experiments on these rocks, it can be stated that there is no logical and clear relationship between the type of physical properties of rocks and preloading stress levels and the results of stress retrieval.
