岩土破坏过程声发射特征的实验研究

通过对重庆黄泥包滑坡处采集的岩土试样进行单轴压缩和拉伸实验,测试了岩土破坏过程的声发射信号,得出了岩土破坏过程声发射的基本特征:在单轴压缩实验中,声发射能量信号随着压力的增加呈现连续增加的趋势,在主破裂时刻有较强声发射能量信号产生;在蠕变实验中,AE在压力上升阶段信号增强,在恒定压力下,AE信号有所减弱,整体趋势较为平缓;在拉伸实验中,岩土的破坏方式呈主震型和群震型;AE信号能够反映岩土受载过程;岩土的抗压强度与声发射能量最大值呈正相关性;加载速率越大,声发射能量最大值也越大。

Experimental Study on Acoustic Emission Characteristics of Rock and Soil in the Failure Process

Uniaxial compression and tension experiments have been done with rock and soil samples taken from Huangniba landslide Chongqing. In the process of fracture of rock and soil, acoustic emission signals have been recorded and the characteristics of acoustic emission of rock and soil in the failure process are displayed. In the process of uniaxial compression loading, acoustic emission energy signals increase with the increase of pressure, .and in main fracture acoustic emission signals become stronger. In the process of creep loading, acoustic emission signals become stronger under the stage of pressure increasing, and become weaker and then tend to be unchanged under the stage of constant pressure. In tension test, two modes of failure of rock and soil are observed, referred to as main shock type and swarm shock type, respectively. Acoustic emission signals can reflect the loading process of rock and soil. The maxium acoustic emission energy is in positive correlation with the strengths of rock and soil. The acoustic emission energy signals become stronger with the increase of loading rate.