准动态单轴压缩中类岩材料波速变化试验研究  

Experimental study on wave velocity variation of rock-like material under quasi-dynamic uniaxial compression

作　　者：黄晓程[1] 李海波[1] 夏祥[1] 王秒[1] 宋全杰[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学国家重点实验室,湖北武汉430071

出　　处：《人民长江》2013年第19期59-63,共5页Yangtze River

基　　金：国家杰出青年科学基金项目(51025935);国家重点基础发展计划"973"项目(2010CB732001);国家自然科学基金青年科学基金项目(50809070)

摘　　要：为了解岩石内部的损伤程度和微裂纹发展状况,对单轴准动态荷载下石膏试样应力状态和纵波速度的关系开展了试验研究.在轴向荷载作用下,分别对石膏试样的纵向和横向进行了声波测试.结果表明：低强度石膏试样的应力声速曲线特征明显,其峰值后曲线可以划分为4个阶段,各阶段声速变化与试样的损伤破坏相一致,与应力应变曲线的各变化阶段也能很好对应,且试样的应力波速关系在轴向和横向表现出相似的变化特征.石膏试样的损伤阈值出现在应力为抗压强度60％ ～ 80％时,从应力应变曲线看,损伤阈值出现在试样由弹性变形向塑性变形转变的阶段.The relationship between the stress state and longitudinal wave velocity of gypsum samples under quasi - dynamic u- niaxial compression was studied through laboratory experiment. The vertical and horizontal sonic tests under axial loads of the gypsum samples were carried out respectively. The results show that the characteristics of stress and sound - velocity of low - strength gypsum samples are obvious under uniaxial quasi - dynamic load. The curve after the peak can be divided into four stages, and the velocity variation of each stage is in a good consistency with the damage phenomenon of rock in loading process as well as the variation of stress - strain curve. Moreover, the relationship between stress and wave velocity shows the similar law at the axial and transversal direction. The stress that is up to the 60% to 80% of the compressive strength can be specified as the damage threshold of the gypsum sample, meanwhile, from perspective of the stress - strain curve, the damage threshold appears at the transition from elastic deformation to plastic deformation.

关 键 词：单轴压缩 石膏试样 声速 损伤阈值 类岩材料 

分 类 号：TU45[建筑科学—岩土工程]