STUDY OF ROCK MESO-DAMAGE EVOLUTION LAW AND ITS CONSTITUTIVE MODEL UNDER UNIAXIAL COMPRESSION LOADING
单轴压缩岩石损伤演化细观机理及其本构模型研究

The computerized tomography (CT) real-in-time testing of rock moodamage evolution law under uni- axial compression loading has been completed using the specified loading equipment corresponding to the CT ma- chine developed by authors. The estimation method of microcrack width is given. The stress threshold value of damage is determined with the quantitative analysis on testing results. The preliminary results of rock meso-dam- age evolution law under uniaxial compression are obtained. Based on the CT testing results, the complete rock stress-strain process curve is divided into several. From the point of view of engineering application, the pre-peak 3-segment damage evolution equation and constitutive model of rock are given. The obtained theory re- sults coincide well with the testing results.