大理岩单轴循环加卸载失稳声发射先兆研究  

Research on acoustic emission precursors of instability of marble under uniaxial cyclic loading and unloading conditions

作　　者：张鑫[1] 周宗红[1] 张俊杨 王明华 李益 ZHANG Xin;ZHOU Zonghong;ZHANG Junyang;WANG Minghua;LI Yi(School of Land Resources Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Zijin Mining Group Co.,Ltd.,Longyan Fujian 364200,China;Xinping Ludian Mining Co.,Ltd.,Yuxi Yunnan 653401,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]紫金矿业集团股份有限公司,福建龙岩364200 [3]新平鲁电矿业有限公司,云南玉溪653401

出　　处：《化工矿物与加工》2020年第6期1-6,共6页Industrial Minerals & Processing

基　　金：国家自然科学基金资助项目(51864023,51264018,51064012)。

摘　　要：为探索岩石破坏的前兆信息,开展了大理岩单轴循环加卸载试验,采用动态模糊聚类方法,研究单轴循环荷载下岩石破裂声发射、加卸载响应比及声发射b值等特征参量的变化规律,结果表明:单轴循环加卸载条件下,岩石声发射活动主要经历3个阶段,即声发射平静期、声发射活跃期、声发射剧烈期,其中在声发射剧烈期前会经历一段相对平静期,相对平静期的出现可以作为岩石失稳破坏的前兆信息;通过聚类分析将大理岩声发射信号分为3类,第3类声发射信号可作为岩石失稳前兆特征信号;在岩石失稳破坏时,加卸载响应比会在其破坏前的第2个循环大幅度增长,之后在破坏前的第1个循环又大幅度跌落,加卸载响应比的这一异常变化可以作为岩石即将失稳破坏的先兆信息;声发射能量及振铃计数、加卸载响应比、声发射b值等均有一定的局限性,但将三者结合起来综合分析,可以提高预测岩石失稳的准确度。In order to reveal the precursory information of marble instability,the uniaxial cyclic loading and unloading test of marble was carried out.The dynamic fuzzy clustering method was used to study the change rules of characteristic parameters such as acoustic emission,loading and unloading response ratio and acoustic emissionb value under uniaxial cyclic loading.The results show that under the condition of uniaxial cyclic loading and unloading,the acoustic emission activities of rock mainly go through three stages,namely,the quiet stage,the active stage and the intense stage of acoustic emission,in which a relatively quiet period will occur before the intense stage of acoustic emission,and the appearance of the relatively quiet period can be used as the precursor information of rock failure.The acoustic emission signals of marble can be divided into three categories by cluster analysis,and the third category can be used as the precursor signal of rock instability.In the case of rock failure,the loading and unloading response ratio will increase significantly in the second cycle before failure,and then drop significantly in the first cycle before failure.This abnormal change of loading and unloading response ratio can be used as the precursor information of rock failure.There are some limitations in acoustic emission energy and ringing count,loading and unloading response ratio,acoustic emission b value,etc.,but the accuracy of rock instability prediction can be improved by combining the three factors.

关 键 词：岩石失稳 破坏前兆 循环加卸载 动态模糊聚类理论 振铃计数 加卸载响应比 声发射b值 

分 类 号：TU45[建筑科学—岩土工程]