摘要
对砂岩在自然状态、烘干状态、半饱和状态和饱和状态等不同水饱和状态时循环载荷作用下的变形特征进行了实验研究。测试结果发现:①随着含水量的增加,砂岩的变形有增大的趋势,而其强度将有所下降低;②其塑性滞回环的斜率也越来越小,即在相同的应力变化幅度内,其轴向应变增量有逐渐增大的趋势;横向应变和体应变也呈现越来越大的规律。
The deformation characteristics of sandstore is studied under cyclic loading and four different saturations （drying, natural, undernourished, saturation state）. As as results, the sandstore has typical elasticity-plasticity deformation characteristics; The deformation characteristics of sandstore increase, subdued intensity decline and compression strength decline with increasing of saturation exponent. The Upper limit-stress of the load-range diminish gradually. The slope of the hysteresis curve become taper, i. e. at the same load-range, The increment of the epaxial-deformation increase. The diametral-deformation and vol. -deformation largen. Vol. -deformation due to the epaxial-deformation and the diametral-deformation, but the diametral-deformation has great influence on it. The hysteresis curve would diminish but don＇ t disappear and become more and more invariable.
出处
《中国矿业》
北大核心
2006年第10期109-112,共4页
China Mining Magazine
基金
国家自然科学基金项目(50574108)
教育部"春晖计划"资助项目
重庆大学研究创性新实验项目
关键词
砂岩
循环载荷
饱和度
变形特性
Sandstore ,The cyclic loading, Saturation, The deformation characteristics
