随着岩石力学测试设备的伺服控制性能、变形测试技术及试件破坏过程监测手段等改进，国际岩石力学会测试委员会 (ISRM) 建议的单块试件三轴试验方法有必要进行更进一步的研究。 MTS815 试验系统以其优良的加载系统、控制系统、测量系统等成为当今岩石力学测试研究领域的主要设备之一。基于该系统对锦屏粗晶大理岩岩样开展大量的常规三轴试验和单块多级加载三轴试验，研究结果表明 : 单样三轴试验得到的强度参数与常规三轴试验结果相比，内摩擦角和黏聚力都有一定比例的减小，随着应力水平增加两者越接近；高应力水平下，大理岩单块多级加载三轴试验方法对低、中等硬脆性岩石是基本适用的、可行且可靠的。研究成果对特殊条件下的工程岩石力学参数取值方法和新试验方法的推广具有重要的工程应用价值。

The method of triaxial testing on single specimen proposed by ISRM (International Society for Rock Mechanics) needs to be further studied as the servo controlling performance, the deformation measurement techniques and the monitoring approach for rock failure have improved. MTS815 testing system is one of the most excellent instruments in rock mechanics testing for its outstanding loading system, controlling system and measurement system. Based on this system, conventional triaxial tests and multiple level loading triaxial test are carried out on single specimen of Jinping coarse crystalline marble. It is revealed that the strength parameters of internal friction angle and cohesion by single specimen method are both smaller than those by conventional triaxial compression test, and the gap between the two parameters gets smaller with the confining pressure increases. It is concluded that the triaxial tests on single marble specimen with multiple level loading are suitable, feasible and reliable for low and moderately hard brittle rock. The conclusions will be of great practical value for the determination of mechanical parameters under special conditions and for the promotion of this method.