浅谈采矿工程中流固耦合问题的复杂性

Interaction between the deformation of rock mass around a coal seam or an around roadway and the migration of fluid in the rock mass exists broadly in mining engineering. Fractures within the rock mass join up with each other when this interaction has developed to an extent, and disasters such as water inrush or gas outburst will take place because of the instability of the motion of fluid. In the current article, types of fluid-solid coupling were introduced briefly, and review on the developments in the relevant fields were narrated. The complexity of fluid-solid coupling systems in mining engineering was set forth from five respects. (1) Because of the excavation of coal and the failure of material in rock mass, the boundaries, including the interface among the elastic zones, plastic zones and fractured zones (overbroken zones), vary with time. Variable boundary is the main reason of complexity. (2) Pre-existing fractures and secondary fractures with different scales distribute disorderly, it made rock mass posses of discontinuity, heterogeneity, anisotropicy. (3) Nonlinearity in both the migration of fluid and deformation of rock mass may lead the coupling system to become structural unstable, and may lead to chaos. (4) Because of the complexity in fluid-solid coupling, the numerical stability of the algorithm for calculating the dynamic response of the coupling system may be difficult to realize. (5) The configuration of rock mass is extremely complicated because of complicated fracture network and interactional roadway.