基于时间尺度下岩石损伤破坏前兆信息研究

Study on Precursor Information of Rock Damage Based on Time Scale

为研究岩石在循环加卸载作用下损伤信息与岩石破坏之间存在的关系,开展了针对大理岩试件的室内力学试验,结合弹性模量法、Felicity比值、加卸载响应比(LURR)三种损伤信息来对岩石的损伤程度进行判定,并在时间尺度下进行分析。结果表明:三种损伤信息均对岩石破坏变形过程中的损伤情况进行了良好的反馈;岩石处在稳定损伤阶段的时间大约为总时间的60%-80%,处在临近失稳的绝对损伤阶段的时间大约为总时间的20-40%;三种损伤计算方法各有优劣,综合利用可对工程施工进行良好的指引。

In order to study the relationship between rock damage and rock destruction under cyclic loading and unloading, an indoor mechanics test was conducted for marble samples, combining elastic modulus method, Felicity ratio, and loading and unloading response ratio（LURR）. The damage information is used to determine the degree of rock damage and analyze it on the time scale. The results show that the three kinds of damage information provide good feedback on the damage conditions during rock failure and deformation; the time for the rock to be in the stable damage stage is approximately 60% to 80% of the total time. The time of the absolute damage stage near the instability is about 20-40% of the total time; Three kinds of damage calculation methods have their own advantages and disadvantages.Comprehensive utilization can provide good guidance for project construction.