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赵扬锋*,刘力强,张寅.三点弯曲脆性岩石试样的微震和电荷感应信号变化规律[J].实验力学,2018,33(6):929~937
三点弯曲脆性岩石试样的微震和电荷感应信号变化规律
On the variation of microseismic and charge-induction signals of brittle rock specimens in three-point bending experiment
投稿时间: 2017-03-30  最后修改时间: 2017-05-12
DOI:10.7520/1001-4888-17-080
中文关键词:  三点弯曲试验  微震  电荷感应
英文关键词:three-point bending experiment  microseism  charge induction
基金项目:国家自然科学基金面上项目 (51274114),国家重点研发计划项目资助(2016YFC0801403),中国博士后基金特别资助(2014T70103)资助
作者单位
赵扬锋* 1.辽宁工程技术大学 力学与工程学院 辽宁阜新 123000 2.中国地震局地质研究所 地震动力学国家重点实验室 北京 100029 
刘力强 中国地震局地质研究所 地震动力学国家重点实验室 北京 100029 
张寅 辽宁工程技术大学 力学与工程学院 辽宁阜新 123000 
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中文摘要:
      本文采用微震和电荷感应同步监测试验系统,通过三点弯曲试验研究了脆性岩石变形破裂过程的微震和电荷感应信号的变化规律。试验结果表明:在三点弯曲试验中,花岗岩和大理岩脆性岩石中预制裂纹试样和完整试样的载荷峰值与峰值位移比差别不大,而花岗岩的载荷峰值与峰值位移比大于大理岩的。在三点弯曲试验中花岗岩和大理岩脆性试样变形破裂过程会产生微震和电荷感应信号,花岗岩试样变形破裂过程产生的微震和电荷感应信号强度比大理岩试样的大且事件数也多,完整试样变形破裂过程产生的微震和电荷感应信号强度比预制裂纹试样的大且事件数也多。试样在破裂发展阶段微震和电荷感应信号强度远大于弹性阶段微震和电荷感应信号强度。试样在破裂发展阶段产生的微震和电荷感应信号持续时间也较大。三点弯曲试验中脆性试样变形破裂过程产生的微震和电荷感应信号事件数明显比压缩破裂时少。利用微震和电荷感应信号在岩石变形破裂过程的不同阶段相似性和差异性,对微震和电荷感应信号综合分析能更有效监测三点弯时脆性岩石的变形破裂过程,更准确获得岩石失稳破坏的前兆信息。
英文摘要:
      In this paper, the variation pattern of microseismmic and charge-induced signals of brittle rock specimens during deformation and fracture process were studied based on three-point bending experiment and by using experimental system composed of microseism and charge induction synchronous monitoring device.Experimental results show that in three-point bending experiment, there is only little difference between the ratios of peak load to peak displacement of prefabricated crack specimen and that of intact specimen for both granite and marble brittle rock specimens. The ratio of peak load to peak displacement of granite is larger than that of marble. In three-point bending experiment, the deformation and fracture process of brittle samples of granite and marble will produce microseismic and charge-induced signals. The intensity of microseismic and charge-induced signals produced in deformation and fracture process of granite samples is larger than that of marble samples and the number of events of granite is more than that of marble samples. The intensity of microseismic and charge-induced signal produced in deformation and fracture process of intact specimen is larger than that of prefabricated crack specimen and the number of events of intact is more than that of the sample with prefabricated crack. On the fracture development stage, the intensity of microseismic and charge-induced signals is much higher than that on elasticstage. The duration of microseismic and charge-induced signals produced by specimens during the fracture development stage is also longer. The number of microtremors and charge-induced signal event during deformation and fracture process of brittle specimens in three-point bending experiment is obviously less than that in compression fracture. Using the similarity and difference of microseismic and charge-induced signals on different stages of rock deformation and fracture process, the comprehensive analysis of microseismic and charge-induced signals can more effectively monitor the deformation and fracture process of brittle rock subjected to three-point bending, and obtain more accurately the precursor information of rock instability and failure.
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