非均质泥石流固液两相运动特征探讨
摘要
Non-homogeneous debris flow is a typical two-phase flow with a large range of solid grain size and specific gravity and no-uniform velocity distribution. Based on the principle of the minimum energy dissipation, the critical diameter between solid phase of the coarse particles and liquid phase composed by both the fine particles and water in non-homogeneous debris flow was established. Furthermore, based on the modified Darcy’s formula and mass conservation law, two-phase flowing velocities for non-homogeneous debris flow were developed preliminarily. Correspondingly, it has been verified that calculating value using the velocity formulas of solid and liquid two-phase flow is corresponding to the measured data from Jiangjia gully, Yunnan Province, China. There comes to some meaningful conclusions, such as the velocity of solid phase is more than one of liquid phase due to the specific gravity higher than 2.234 of debris flow, the corresponding deposition shows the inverse property; whereas velocity of solid phase is usually less than one of liquid phase in the general situations, the corresponding deposition behaves the straight property. If the velocity of two phases become much closer, the corresponding deposition possesses intermix property. These results are very significant for both developing dynamical model for non-homogeneous debris flow and designing of control engineering for debris flow disasters.