论文部分内容阅读
在刚性试验机上对花岗岩岩样进行单轴加载试验,在应力速率分别为20,30,40kN/min条件下对花岗岩受力变形过程中的力学特性和声发射特性进行了测试和分析。随应力速率的增大,花岗岩的抗压强度依次提高,应力速率越大,岩石的破坏越趋于剧烈;声发射活动伴随花岗岩单轴压缩破坏全过程,在压密阶段及弹性变形阶段,声发射活动不显著,声发射信号较少,而在应力水平达到岩样抗压强度的95%左右时,声发射参数出现剧增;应力速率为30kN/min时,声发射活动最剧烈,且破坏时的累积声发射数也最多。试验结果表明,应力速率对花岗岩的力学特性和声发射信号特性具有显著的影响。
The uniaxial loading tests of granite samples were carried out on a rigid testing machine. The mechanical properties and acoustic emission characteristics of granite were tested and analyzed under stress rates of 20, 30 and 40 kN / min respectively. With the increase of stress rate, the compressive strength of granite increases in turn, and the greater the stress rate, the more the rock failure tends to be violent. The acoustic emission activity accompanies the whole process of granite uniaxial compression failure. During the compaction phase and elastic deformation stage, The acoustic emission parameters were not significantly increased, but the acoustic emission signals were less. However, the acoustic emission parameters increased sharply when the stress level reached about 95% of the compressive strength of the rock specimen. When the stress rate was 30 kN / min, the acoustic emission activity was most violent and destroyed When the cumulative number of acoustic emission is also the largest. The experimental results show that the stress rate has a significant effect on the mechanical properties of the granite and the acoustic emission signal characteristics.