加卸载响应比(LURR)、矩／能量加速释放(AM/ER)、态矢量:岩石试件破坏前兆的实验研究

• 作 者: V．Kukshenko S．Elizarov 张晖辉 颜玉定
• 机 构: 中国科学院力学研究所,中国科学院力学研究所,
• 出 处: 世界地震译丛
• 发表日期: 2005年02期
• 关键词: 岩石试件 态矢量 AM/ER LURR 前兆 宏观破坏 声发射实验 损伤演化 岩石破坏 单调加载

为了验证大地震发生前或者非均匀脆性介质宏观破坏前加卸载响应比和能量加速释放等前兆现象,本文进行了三轴应力(压缩)条件下大尺度岩石破坏声发射实验。实验采用4组岩石试件,并且分为单调加载和循环加载两种方式。实验结果证明了脆性材料宏观破坏前加卸载响应比升高和能量加速释放这两种前兆现象。本文提出了一种描述岩石试件损伤演化的新的物理量——态矢量。

In order to verify precursory phenomena such as unloading response ratio and acceleration of energy release prior to the macro-damage of a large-scale earthquake or inhomogeneous brittle media, a large-scale rock failure acoustic emission experiment under triaxial stress (compression) conditions was carried out. The experiment uses four groups of rock specimens, and is divided into monotonous loading and cyclic loading two ways. The experimental results show that the precursors of both the unloading response ratio and the acceleration of energy release before the macroscopic failure of the brittle material are proved. This paper presents a new physical quantity-state vector that describes the damage evolution of rock specimens.