节理岩体爆破破坏模式的机理分析及数值模拟

节理的存在是岩体明显区别于岩石的一个重要特征，也是导致岩体具有非均质性及各向异性的一个重要因素。在对节理影响岩体爆破破坏模式的机理进行分析的基础上，利用能够很好模拟岩体内节理分布及裂纹产生与扩展的一种新的数值方法--数值流形方法，对3种不同节理岩体，即无节理岩体、均布水平节理岩体、均布垂直节理岩体等在均布于垂直于圆周方向上的爆炸荷载作用下的破坏过程进行了模拟。由模拟结果可以明显看出，节理的存在对岩体的破坏模式起到了关键性的控制作用，完整岩体的破坏形式呈现出了很好的对称性，而水平及垂直节理岩体的破坏模式在很大程度上是受到节理分布的控制。

Mechanism Analysis and Numerical Simulation of the Blast Failure Modes of Jointed Rock Masses

The existence of the joints is an important characteristic of rock mass distinctly different from rock, and also an important factor leading to the heterogeneousness and anisotropy of rock mass.On the basis of the analysis of the mechanism of blast failure mode of rock mass affected by joints, a new numerical method, or numerical manifold method, which can perfectly simulate the joint distribution in rock mass and the occurrence and propagation of cracks, is adopted to simulate the failure process of three rock masses with such joints as no joints, averagely distributed horizontal joints or averagely distributed vertical joints respectively under the blast impact load perpendicular to the circumference.From the simulation results, it can be evidently seen that the existence of the joints plays a vital role in controlling the failure form of rock mass.The failure form of the intact rock mass has good symmetry, while for rock masses with horizontal joints or vertical joints, their failure forms are controlled by the distribution of the joints to large extent.