砂岩脆性变形破坏过程中声发射信息试验研究

针对砂岩试样进行了单轴刚性加载试验，并测试整个过程的声发射信息。根据试验情况，可将砂岩在整个变形阶段的声发射信号特征划分为压密、弹性、稳定破裂、非稳定破裂和峰后情况五个阶段。通过对稳定破裂和非稳定破裂分界点对应的临界点处的应力和应变值与峰值应力及其对应的应变比值分析发现，大部分应变比在74%与78%之间；应力比则相对具有较大的离散性，均值在73%左右。上述研究，通过对砂岩脆性破坏过程中声发射信息与应力比和应变比之间的关系分析，增进了对岩石破裂过程中生发现象的认识，为相应岩石脆性破坏导致的地质灾害分析提供了新的研究思路。

RESEARCH ON AE VARIATION OF SANDSTONE BRITTLE FAILURE WITH ALONG LOADING BY UNIAXIAL COMPRESSION

Aiming at the changing of AE in sandstone, it was analyzed the AE accumulation counts and emission. Analyzing the relationship of AE and rock compression process under loading, it is classified the AE into five stages according the different deformation stages, which are the density stage, the elastic stage, crack stable growth stage, crack unsteady growth stage and the damage stage. Combining rock uniaxial compression results, it is shown that the strain ratio between the AE mutation of critical state and peaking state has a value range 74%and 78%, but the stress ratio has a larger discrete, which has a vaerage value nearly to 73%. In this article, it is discussed the new method to analysis of instability for rock brittle failure based on AE.