论文部分内容阅读
对脆性岩石中由于应力和损伤而导致地震波速变化的数值研究技术作了介绍。通过耦合质点的链接模拟岩石样本,将其置于静水压和偏荷载状况下。在静水压加载期间,通过新的接触的形成和波速增大直至裂纹闭合。在偏荷载过程中,通过在裂纹开口的正交方向上耦合链的破坏和波速降低形成新裂纹。所模拟的波速变化特性与在实验室中观测到的接近。这个模型提供了独特的性能,具有直接检查微观过程,引导观测波速变化的能力。
A numerical study of the seismic wave velocity changes in brittle rocks due to stress and damage is presented. The rock sample is simulated by a link of coupled particles, placed under hydrostatic and partial load conditions. During hydrostatic loading, the formation of the new contact and the increase of the wave velocity until the crack is closed. During partial loading, a new crack is formed by the destruction of the coupling chain and the decrease of the wave velocity in the orthogonal direction of the crack opening. The simulated changes in wave velocity are similar to those observed in the laboratory. This model provides a unique performance with the ability to directly inspect microscopic processes and guide changes in the observed wave velocity.