基于超声检测的软岩单轴流变损伤试验  

Uniaxial rheological damage experiment of soft rock based on the ultrasonic testing

作　　者：吴春 郭棋武 洪涛[2] 陈沅江[2] 

机构地区：[1]湖南中大建设工程检测技术有限公司,湖南长沙410205 [2]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《煤田地质与勘探》2017年第5期105-111,120,共8页Coal Geology & Exploration

基　　金：国家自然科学基金项目(51274251)~~

摘　　要：采用软岩相似材料进行了2种不同流变加载方式下的单轴流变损伤破坏试验,并通过超声检测技术获得了软岩在各级流变阶段的超声信号。试验结果表明:软岩相似材料具有强烈的黏、弹、塑性变形特征,选用西原模型对软岩各级流变过程进行模拟较为合适;当应力达到或超过软岩试件单轴抗压强度的80%时,纵波波速曲线才会在流变过程中持续下降,出现可检测损伤迹象,而首波振幅曲线波动大,检测结果不准确;以波速定义损伤变量,得到了软岩流变过程损伤演化曲线。试验结果能为软岩工程长期流变下的结构稳定性提供依据。The uniaxial rheology damage and failure tests of soft rock were done under two different loading modes,and the ultrasonic signal of each rheology process was monitored by ultrasonic detector.The test results were as follows： soft rock exhibited the obvious sticky,elastic and plastic characteristics and using visco-elastoplastic model to simulate every rheology process of soft rock was suitable; when the stress reached or exceeded 80% of soft rock uniaxial compressive strength,the longitudinal wave velocity curve would have sustainable down trend in the rheology process and the damage signals could be detected,but the amplitude curve of first wave was not accurate; the damage evolution curve of rheology process could be got through defining damage variable by velocity.The results could provide basis for the structure stability of soft rock engineering during long-term rheological process.

关 键 词：软岩 单轴流变 损伤 超声检测 波速 

分 类 号：TU455[建筑科学—岩土工程]