含裂隙类岩材料疲劳损伤过程声学特性研究  

Study on Acoustic Property in Fatigue Damage Process of Fractured Rocklike Materials

作　　者：李润[1,2] 简文彬[1,2] 

机构地区：[1]福州大学岩土工程与工程地质研究所,福建福州350108 [2]福州大学资源与城乡建设系,福建福州350108

出　　处：《水利与建筑工程学报》2014年第3期115-120,124,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金(41072232);福建省自然科学基金(2010J01254)资助

摘　　要：采用单轴压缩等幅疲劳试验方式,对含预设裂隙的类岩模型试样、相应加锚模型试样及完整试样进行循环荷载试验,对试样进行实时超声波速、波形、时域波幅的测量及分析。结果表明:超声波速随裂隙倾角增大而减小,裂隙倾角0°试样波速最大,裂隙倾角90°试样波速最小;纵波波速随疲劳损伤的发展呈较明显的倒S形三阶段衰减规律,锚固试样波速衰减曲线比无锚杆试样平稳;波形在疲劳损伤过程中从近似半圆形逐渐发生畸变,波形相关系数随疲劳损伤累积呈下降趋势;时域幅值变化不稳定,锚固试样的时域幅值大于相同情况下无锚杆试样。The uniaxial compression test of constant amplitude fatigue was adopted to make the cyclic loading tests for pre-fractured rocklike model specimens ,corresponding anchored model specimens and intact specimens .And the real-time ultrasonic wave velocity ,wave form ,time-domain amplitude of the specimens were measured and analyzed .The re-sults indicate that the ultrasonic wave velocity decrease with the increase of fractured angle .When the fractured angle is 0＆#176; ,the wave velocity of the specimens is the fastest ,and when the fractured angle is 90＆#176; ,the wave velocity of the speci-mens is the slowest .With the development of fatigue damage ,the longitudinal wave velocity of the specimeus presents the“inverted S” attenuation law of three stages ,while the attenuation curve of the wave velocity for the anchored specimen is more stable than that of non-anchored specimen .The wave form is gradually distorted from approximate semicircle in the process of fatigue damage ,and the correlation coefficient of the wave form shows a declined tendency .The changes of time-domain amplitude are unstable ,and the time-domain amplitude of the anchored specimen is larger than that of non-anchored specimen .

关 键 词：含裂隙类岩材料 循环荷载 疲劳损伤 声学参数 

分 类 号：TU458.4[建筑科学—岩土工程]