【作者】 冯春林； 吴永丰； 冯福贤；

【Author】 FENG Chunlin~1,WU Yongfeng~2,FENG Fuxian~1 (1.Faculty of Nuclear Resources and Safety Engineering,University of South China,Hengyang,Hunan 421001,China; 2.Nuclear Industry of Gansu 219 Team,Tianshui,Gansu 741025,China)

【机构】 南华大学核资源与安全工程学院； 核工业甘肃219大队；

【摘要】 为解决岩石参数离散性大的难题,通过对花岗岩、白砂岩单轴压缩、疲劳变形特性试验,提出一种测定循环荷载下岩石临界应力的新方法。该方法以峰值应力、应变的大小为基础,对全应力-应变曲线进行分组;然后进行不同高、低应力水平的疲劳试验;根据试验结果求出稳态和非稳态工作线,并求出它们的交点以及该点的2个重要参数:应力和应变,即临界应力和临界应变。用分组法求得的参数与传统方法相比,更准确,更符合实际,也更经济和安全。因此该法对岩石基础工程有实用价值。更多还原

【Abstract】 For seeking a solution to solve of the discreteness of rock parameters,on the basis of the testing results of uniaxial compression,fatigue deformation properties of granite and white sandstone,a new measurement method of the critical stress of rock is put forward.The method is first based on the different peak stress-stain curves,which is grouped,and then fatigue testing is performed at different heights,at low stress levels.According to testing results,steady and unsteady state curves can be drawn and both curves crossover point is found.Its two important parameters,i.e.stress and strain,are the critical stress and strain.The grouping method is even more exactness,more corresponding to facts,more economic and safe than the tradition method.It would have practical value in the rock base engineering.更多还原