矿山井下泥石流形成机理与固液耦合数值模拟研究

在雨季，随矿山围岩崩落的上层覆盖物和土壤吸水饱和,在爆破动载荷作用下可能产生液化并涌入采场，形成井下泥石流，给矿山的安全生产带来重大危害。运用动态非线性固液耦合本构方程，研究在动载荷作用下饱和岩土液化的机理，分析爆破动载荷与井下泥石流的关系。以程潮铁矿多次发生的井下泥石流事件为例，运用OPENSEES有限元数值模拟,计算结果表明，爆破动载荷对泥石流存在直接影响，最终计算结果与数值模拟吻合，为雨季矿山的安全生产提供了依据。

Investigation on the Formation Mechanism of Mine Underground Mud-Stone Flow and Numerical

In rainy seasons, the water-saturated overlying materials caved in sublevel caving mining may be liquefied under blasting-caused dynamic load and rush into the stope to form an underground mud-stone flow, bringing a great danger to underground safety mining. By applying a dynamic non-linear coupled solid-liquid constitutive equation, the paper studies the liquefaction mechanism of saturated soil under the function of dynamic load and analyzes the relation between blasting dynamic load and underground mud flow. An OPENSEES infinite element numerical simulation is made for the underground mud flow events occurring many times in Chengchao Iron Mine. The result shows that dynamic load caused by blasting has direct impact on mud-stone flow. The final computing result conforms to that of numerical simulation, thus providing a basis for realizing a safety production of mine in rainy seasons.