为了探究盐岩压缩变形破坏过程中,声发射现象与内部损伤的相关关系,利用四川大学MTS815岩石力学试验系统,对云南安宁盐岩进行单轴压缩试验,分析了盐岩声发射特征。依据损伤理论,得到了基于声发射参数的盐岩的损伤演化模型,并引入修正系数对其进行理论修正,分析损伤终值对损伤本构模型的影响。研究结果表明:盐岩的声发射(acoustic emission,简称AE)振铃计数率和能量率在弹性极限附近达到最大值,之后呈现高频低幅值的声发射现象;基于声发射的盐岩损伤变量值在压缩变形前期增加较快;基于AE累计振铃计数得到的损伤值<基于AE累计能量计算得到的盐岩损伤值;修正后的声发射损伤理论模型曲线与试验曲线全过程吻合较好,能够较好地反映盐岩内部损伤演化过程;振铃计数参数模型比能量参数模型能更好地模拟盐岩的损伤演化特征。
Abstract
In order to explore the relation between acoustic emission phenomenon and internal damage in the failure process of compression deformation of rock salt, we conducted uniaxial compression test on salt rock from Anning, Yunnan province using MTS815 rock mechanics test system of Sichuan University. The damage evolution model of rock salt was established with acoustic emission parameters based on damage theory and the damage variable D was modified by coefficient of correction. The research results show that the maximum values of ring count rate and energy rate appeared near the elastic limit and the phenomenon of high frequency and low amplitude appeared later; the damage value based on AE increased rapidly in the early stage of compressive deformation, and the damage value based on AE accumulated ring counts is smaller than that based on cumulative energy; the revised damage model curve is in agreement with the whole process of test curve and could reflect the damage evolution process of rock salt well.Simulation using ring count can reflect the damage evolution characteristics of rock salt better than using energy.
关键词
盐岩 /
声发射 /
损伤模型 /
损伤变量 /
修正系数
Key words
rock salt /
acoustic emission /
damage model /
damage variable /
coefficient of correction
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] XIE He-ping,LIU Jian-feng,JU Yang,et al. Fractal Property of Spatial Distribution of Acoustic Emissions during the Failure Process of Bedded Rock Salt[J]. International Journal of Rock Mechanics and Mining Sciences, 2011, 48(8): 1344-1351.
[2]LIU Jian-feng,XIE He-ping,HOU Zheng-meng,et al. Damage Evolution of Rock Salt under Cyclic Loading in Uniaxial Tests[J]. Acta Geotechnica,2014, 9(1):153-160.
[3] 刘建锋,裴建良,张 茹,等. 基于多级荷载试验的岩石损伤模量探讨[J]. 岩石力学与工程学报,2012,31(增1):3145-3151.
[4] 郭印同,赵克烈,孙冠华,等.周期荷载下盐岩的疲劳变形及损伤特性研究[J]. 岩土力学,2011,32(5):1353-1359.
[5] SCHULZE O, POPP T, KERN H. Development of Damage and Permeability in Deforming Rock Salt[J]. Engineering Geology, 2001, 61(2/3): 163-180.
[6] STORMONT J C. In situ Gas Permeability Measurements to Delineate Damage in Rock Salt[J]. International Journal of Rock Mechanics and Mining Sciences, 1997, 34(7): 1055-1064.
[7] OHTSU M. Acoustic Emission Characteristics in Concrete and Diagnostic Application [J]. Acoustic Emission, 1987, 6(2): 99-108.
[8] OHTSU M. Rate Process Analysis of Acoustic Emission Activity in Core Test of Concrete[J]. Concrete, 1992 (20):143-153 .
[9] HEIPLE C R,CARPENTER S H.Acoustic Emission from Dislocation Motion[M]. In: Acoustic Emission, New York: Gordon and Breach Science Publishers, 1983.
[10]WADLEY H N G, SCRUBY C B, SPEAKE J H. Acoustic Emission for Physical Examination of Metals[J]. International Metals Reviews, 1980, 25(1): 41-64.
[11]TANG C A,XU X H. Evolution and Propagation of Material Defects and Kaiser Effect Function[J]. Journal of Seismological Research,1990,13(2):203-213.
[12]刘保县,黄敬林,王泽云,等.单轴压缩煤岩损伤演化及声发射特征研究[J].岩石力学与工程学报,2009,28(增1):3234-3238.
[13]高保彬,李回贵. 基于声发射参量的煤样损伤模型研究[J].防灾减灾工程学报,2014,34(1):101-106.
[14]杨永杰,王德超,郭明福,等. 基于三轴压缩声发射试验的岩石损伤特征研究[J].岩石力学与工程学报,2014,33(1):98-104.
[15]谢和平. 岩石混凝土损伤力学[M]. 徐州:中国矿业大学出版社,1990.
[16]姜德义,陈 结,任 松,等. 盐岩单轴应变率效应与声发射特征试验研究[J].岩石力学与工程学报,2012,31(2):326-336.
[17]任 松,白月明,姜德义,等. 周期荷载作用下盐岩声发射特征试验研究[J].岩土力学,2012,33(6):1613-1618.
[18]李浩然,杨春和,刘玉刚,等.单轴荷载作用下盐岩声波与声发射特征试验研究[J].岩石力学与工程学报,2014,33(10):2107-2116.
[19]KACHANOV L M. On the Time to Failure under Creep Conditions [J]. Izv AN SSSR Otd Tekhn Nauk,1958, 8(2): 26-31.
[20]LEMAITURE J. Evaluation of Dissipation and Damage in Metals Submitted to Dynamic Loading[C]∥Proceedings of the ICM-1. Kyoto, Japan, 1972:540-549.
[21]郑雅丽,张华宾,王芝银,等. 含杂质盐岩力学特性对比试验研究[J].煤炭学报,2012,37(1):17-20.
[22]王祖荫.声发射技术基础[M].济南:山东科学技术出版社,1990.
[23]任建喜,葛修润.单轴压缩岩石损伤演化细观机理及其本构模型研究[J].岩石力学与工程学报,2001,20(4):425-431.
[24]葛修润,任建喜,蒲毅彬,等. 岩石疲劳损伤扩展规律CT细观分析初探[J].岩土工程学报,2001,23(2):191-195.
基金
国家自然科学基金项目(51120145001,51104101,51374148)
PDF(1888 KB)
