含三维预置单裂纹缺陷岩石破坏试验研究

EXPERIMENTAL STUDY ON FAILURE BEHAVIOR OF ROCK CONTAINING THREE-DIMENSIONAL SINGLE PRE-EXISTING FLAW

开展含三维裂纹缺陷岩石破坏行为的研究,是当今固体力学特别是岩石力学研究的重要课题之一,具有重要的学术和工程意义。基于作者提出的三维预置裂纹缺陷岩石三维破坏研究的试验方法,开展含单个不同角度三维预置裂纹玄武岩试样的破坏研究,试验结果显示:(1)三维裂纹的方向和裂纹缺陷的大小,对岩石损伤破坏面的形成,对岩块破坏强度有直接影响;(2)含三维裂隙岩石的屈服值与峰值的比值为0.75～0.82,平均为0.78;残余值与峰值的比值为0.58～0.67,平均为0.63,相对完整岩石屈服值和残余值与峰值的比值,其变化并不明显。

The investigation on the brittle failure behavior of rock mass containing flaws is one of the important research fields of solid mechanics, especially in rock mechanics. It is also significant for engineering and academic studies. An experimental method for investigating three-dimensional failure process of rock containing three- dimension pre-existing flaws is proposed. By employing this method, the three-dimensional failure behaviors of basalt specimen containing single pre-existing flaw with different angles are investigated. The following experimental results have been drawn. （1） Failure surface and peak strength of rock mass containing 3D flaw are influenced directly by propagation direction and volume of flaw. （2） For rock containing 3D flaw, the ratio of yield strength to peak strength equals 0.75 - 0.82, and average value is 0.78; the ratio of residual strength to peak strength equals 0.58 - 0.67, and average one is 0.63. For intact rock, the ratio of failure（residual） strength to peak strength has little changes.