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本文根据岩样直切口三点弯试验的载荷—加载点位移曲线形状的分析和刚度理论,认为可用普通材料试验机作出直切口三点弯试验最大载荷后的加卸载循环,并得到试验验证。用大理岩和花岗岩标准短棒试件试验得出反复加卸载对岩石抵抗裂纹扩展能力(即K_(1C))的影响。根据四种试件的断裂韧度试验结果,从理论和实验上论述了直切口三点弯试验与V形切口试验同样存在“塑性”影响,提供了直切口三点弯试验的“塑性”修正方法。
According to the analysis of the load-load point displacement curve and the stiffness theory of straight-cut three-point bending test of rock sample, this paper considers that the normal material testing machine can be used to make the load-unload cycle after the maximum load of the straight-cut three-point bend test, and the test is verified. The impact of repeated loading and unloading on rock resistance to crack propagation (ie, K 1C) was tested using marble and granite standard bar specimens. Based on the fracture toughness test results of the four specimens, the “plastic” effect of the straight-cut three-point bend test and the V-notch test is discussed theoretically and experimentally, and the “plasticity” correction of the straight-cut three-point bend test is provided. method.