| 刘玉春,潘一山,赵扬锋*,樊艺,丁玲.三点弯曲正长花岗岩的多参量信号特征试验研究[J].实验力学,2023,38(2):254~266 |
| 三点弯曲正长花岗岩的多参量信号特征试验研究 |
| Experimental study on multi-parameter signal characteristics of syenogranite on three-point bending tests |
| 投稿时间：2022-03-31 修订日期：2022-05-31 |
| DOI：10.7520/1001-4888-22-079 |
| 中文关键词: 岩石力学，正长花岗岩，三点弯曲，多参量，信号特征 |
| 英文关键词:rock mechanics syenogranite three-point bending multi-parameter signal characteristics |
| 基金项目:辽宁省自然科学基金面上项目(2022-MS-401); 国家自然科学基金面上项目(51274114, 51974150) |
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| 中文摘要: |
| 采用多参量(电荷感应、微震和声发射)同步综合监测系统，开展完整和预制裂纹正长花岗岩的三点弯曲试验，对其变形破裂过程的多参量信号特征进行研究。试验结果表明：完整和预制裂纹正长花岗岩在失稳破坏阶段有最强的多参量信号，在失稳破坏阶段产生的多参量信号的主频比较接近，但完整正长花岗岩多参量信号主频幅值是预制裂纹正长花岗岩多参量信号主频幅值的2倍左右。完整正长花岗岩从线弹性变形阶段、裂纹快速发展阶段到岩石失稳破坏阶段产生应力降时应力降的速度是快速增大的，裂纹快速发展阶段和岩石失稳破坏阶段声发射的最大震级和事件数远大于线弹性变形阶段的最大震级和事件数。正长花岗岩失稳破坏阶段多参量信号同步产生，产生的多参量信号与其他阶段相比主频最小，主频幅值最大；在试样失稳破坏阶段声发射信号早于电荷感应信号产生；电荷感应信号早于微震信号产生，声发射信号持续时间最短，微震信号持续时间最长，多参量信号都在试样产生应力降或失稳前产生。 |
| 英文摘要: |
| The multi-parameter synchronous comprehensive monitoring system (including charge induction, microseismic and AE(acoustic emission)) is built. The three-point bending tests of intact and pre-cracked syenogranite are conduced. The multi-parameter signal characteristics of the deformation and fracture process of intact and pre-cracked syenogranite are studied. The experimental results show that, there are the strongest multi-parameter signals in the instability failure stage of the intact and pre-cracked syenogranite. The main frequency of the multi-parameter signals in the instability failure stage is relatively close, but the main frequency amplitude of the intact syenogranite multi-parameter signals is about twice that of the pre-cracked syenogranite multi-parameter signals. When the stress drop of the intact syenogranite occurs from linear elastic deformation stage, rapid crack development stage to rock instability failure stage, the speed of stress drop increases rapidly. The maximum magnitude and events number of acoustic emission in crack rapid development stage and rock instability failure stage are much larger than those in linear elastic deformation stage. The multi-parameter signals are generated synchronously in the syenogranite instability stage. Compared with other stages, the dominant frequency of the multi-parameter signals is the smallest and the dominant frequency amplitude of the multi-parameter signals is the largest in the syenogranite instability stage. In the instability and failure stage of the syenogranite sample, the acoustic emission signal is generated earlier than the charge induction signal, the charge induction signal is generated earlier than the microseismic signal. The AE duration is the shortest and the microseismic signal duration is the longest in the syenogranite instability stage. The multi-parameter signals are produced before the stress drop or instability of the samples. |
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