岩石微观能量演化与宏观力学行为的关联研究

Correlation Study on Microscopic Energy Evolution and Macroscopic Mechanical Behavior of Rocks

通过三轴应力条件下大尺度岩石破坏声发射试验,得到了三类岩石(花岗岩、砂岩、大理岩)破坏全过程力学特征和声发射特征。试验过程中记录到大量的声发射信息,能够反映岩石试件内部每一个损伤(微裂纹)发生的时间、地点和强度。通过声发射速率过程理论分析,导出声发射累积能量释放的表达式,该表达式反映了岩石破坏过程中的损伤演化状况。此外,对三类岩石的损伤本构行为进行了研究。结果表明,该理论计算模型可以反映岩石类脆性材料的损伤本构行为,进而对其宏观力学行为进行描述。

Experiments on acoustic emission characteristics of large-scale rocks marble） failure were carried out in tri-axial stress state. The mechanical properties emission characteristics were obtained. Lots of acoustic emission during the entire 1 （ granite, sandstone, of rocks and acoustic oading was recorded, which was able to indicate the occurrence time, location and magnitude of every damage （ in the specimen. An expression of accumulative energy release was derived using the AE theory. The expression reflected the damage evolution process of rocks. The micro-crack） damage behaviors of three kinds of rocks were studied based on the accumulative energy release. rate process constitutive The results showed that the present theoretic prediction reflect the damage constitutive, which can describe macroscopic mechanical behavior of brittle materials.