不同单一裂隙倾角对岩体破坏特征的影响

Influence of Different Fissure Dip Angles on Damage Characteristics of Rock Mass

为了探求不同裂隙倾角对岩体破坏特征的影响,针对相似模拟试件进行室内试验。通过试验研究了单轴压缩含有裂隙试件的岩石断裂和节理滑动行为。经测试的岩石模型具有与水平倾角为0°、30°、45°、60°、90°的持久单一裂隙。结果表明,在单轴条件压缩下,完整试件的强度高于存在裂隙的试件;预制裂隙倾角影响着裂隙的发育程度,通过试验结果将裂纹发育程度从大到小排列依次为:60°、45°、0°、30°、90°;不同预制裂隙倾角试件的单轴抗压强度曲线近似成倒U型,并且预制裂隙的倾角在30°与45°之间存在着对试件强度影响最大的角度。

In order to explore the influence of different fissure dip angles on the characteristics of rock mass failure, we carried out indoor tests on similar simulated specimens. In this study, the rock fissure and joint sliding behavior of fissure specimens containing uniaxial compression were studied experimentally. The tested rock model has a permanent single fissure with 0°, 30°,45°, 60° and 90° of horizontal inclination. The results show that under uniaxial compression, the strength of the complete specimen is higher than that of the specimen with fissures. The prefabricated fissure dip angle affects the development of fissure.According to the test results, the degree of fissures development ranges from 60°, 45°, 0°, 30° and 90°. The uniaxial compressive strength curves of specimens with different prefabricated fissures are approximately inverted U-shaped, and the angle of prefabricated fissures is between 30° and 45°, which has the greatest influence on specimen strength.