【摘要】 对于在循环载荷作用下岩石的损伤行为,采用声发射作为损伤参量进行的研究相对较少。根据声发射与损伤具有一致性观点,并结合损伤力学理论,选取声发射宏观信息来对砂岩在循环载荷作用下的损伤演化行为进行描述。结果表明,在严格执行试验规程的基础上,消除试验结果的离散性,利用声发射作为损伤变量建立的低周演化模型能很好的表达其变化规律,并可作为该类岩样的统一演化模型,具有简单可操作性。更多还原

【Abstract】 Numerous methods have been developed to describe the damage characteristics of brittle materials such as rock samples.Each method has its advantage and disadvantage.For rock samples under cyclic loading conditions,the plastic strain method is more popular compared with the acoustic emission method.This paper presents the results of using acoustic emission method to describe the damage evolution process of the sandstone rock samples under the cyclic loading conditions by taking the advantage of relationship between the acoustic emission and the rock damage.The results show that the damage evolution model based on AE variable is consistent with the experimental results.更多还原