花岗岩巴西劈裂试验红外热像特征及颗粒流数值模拟研究

Infrared Thermal Image Features of Granite Brazilian Split Test and Numerical Simulation of Particle Flow

对齐热哈塔尔水电站高地温引水隧洞花岗岩进行了巴西劈裂试验,分析受载过程中红外热像随加载时间的演化特征,同时结合颗粒离散元程序PFC2D研究微观裂纹的扩展规律及能量变化特征。结果表明,花岗岩受载过程中的红外热像特征与应力状态具有明显的对应关系,高温异常带的产生预兆着试样失稳状态的临近。其中张拉破坏模式是花岗岩开裂的主要诱因,破裂过程中能量变化与所处的应力状态联系紧密,反映了花岗岩的细观力学破坏机制。

The granite brazilian split test was carried out for high ground temperature diversion tunnel project of Qirehataer hydropower station. In loading process, infrared thermography evolution characteristics with the loading time were analyzed. Combined with particle discrete element code PFC2D, the microscopic crack propagation law and energy changing characteristics were researched. The results show that during the granite loading process, infrared thermal image features has significantly corresponding relation with the stress state, the appearance of high temperature abnormal belt is a foretaste of specimen instability state. Pulling damage model is the main inducing factor for the granite cracking. The energy changing has an tight coupling with the stress state, which reflects the failure mechanism of granite mieromechanics.