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本文用试验的方法研究了混凝土的线弹性断裂性能.首先以79根试样测定了350~#凝混土的KIc为426.4千牛/米~(3/2),450~#则为500.4千牛/米~(3/2).关于凝混土KIc的尺寸效应问题,本文从脆性破坏统计理论导出了不同尺寸试样间KIc的换算公式,并进行了试验验证.应用声发射技术分析混凝土的裂纹扩展情况是有效的,本文介绍了这方面的试验和结果,并确定了混凝土的失稳扩展点.混凝土Ⅰ-Ⅱ复合型断裂的临界曲线和断裂角曲线是以40根(10种组合)斜裂纹试样和24根(6种组合)四点剪切试样的试验得出的,两类试样的结果十分接近.同时,还得出混凝土的KⅡc.
In this paper, the linear elastic fracture behavior of concrete was studied by the test method. Firstly, the KIc of 350~# plutonite was determined to be 426.4 kN/m~(3/2) with 79 samples, and 450~# was 500.4 thousand. Niu/m~(3/2). Regarding the size effect of the KIc in the conglomerate soil, this paper derives the formula for the conversion of KIc between samples of different sizes from the theory of brittle failure statistics, and conducts experimental verification. The application of acoustic emission technology to concrete analysis The crack propagation condition is effective. This article describes the test and results in this area, and determines the point of instability expansion of the concrete. The critical curve and fracture angle curve of the composite I-II fracture are based on 40 (10 combinations) The results of the oblique crack test and the 24 (six combinations) four-point shear test results show that the results of the two types of test specimens are very close. At the same time, the KIIc of the concrete is also obtained.