Abstract
The micro-indentation test has been regarded as an efficient tool to obtain the elasticity modulus and hardness of the minerals in rock, which is essential for studying the deformation-crack mechanism of the pore structure. However, researches on microscopic plastic parameters have been rarely conducted. This paper develops a novel method to determine the microscopic initial strength and residual strength of brittle sandstone. A dimensionless analysis on the micro-indentation curve of rock is conducted to acquire its key influencing factors of the elastoplastic properties, which include the initial cohesive force and the residual cohesive force. Then, small cylindrical rock samples are prepared for micro-CT scanning and micro-indentation test by a conical indenter to acquire the microstructure, indentation curve, and the microscale elasticity. The pore scale indentation simulation is conducted using the reconstructed rock models with different strength. The function between the indentation curve and strength is deduced by the parametric finite element method (FEM) study. Based on this function, the microscale initial strength and residual strength of the brittle sandstone are determined. The proposed method is validated by comparing the microscale numerical simulation results of uniaxial compression on the representative volume element (RVE) model of rock with the experimental results. A reasonable deviation is observed compared with the experimental benchmark data for the stress-strain curves, as well as Young's modulus and uniaxial compression strength, proving the effectiveness of the proposed method.
| Original language | English (US) |
|---|---|
| Journal | Energy Science & Engineering |
| DOIs | |
| State | Published - Jun 5 2020 |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledged KAUST grant number(s): BAS/1/1351-01
Acknowledgements: This work is supported by the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (Grant No. Z017009); National Natural Science Foundation of China (Grant No. 51909225); National Science and Technology Major Project of China (Grant No. 2017ZX05013001-002); and the China Scholarship Council. We also acknowledge the financial support of King Abdullah University of Science and Technology (KAUST) through the grant No. BAS/1/1351-01 and the National Natural Science Foundation of China through the grant No. 51874262.