Analysis Of Seepage Field And Research Of The Principle Of Water-soil Interaction In Tailing Dam

Our country is that great power of mining industry, the industry mine such as the metallurgy industry, nonferrous metals industry, chemical industry, nuclear industry, building material and light industry all has tails facilities. Thereinto, the tailing dam is the most important part, whose safety is related to the environment and human being's safety directly. Seepage play an important role in the safety of the tailing dam, thus, the more precise computation of seepage field and the more accurate model of disaster-causing mechanism in tailings dam have important theoretical and practical significance.The analysis of the seepage in tailings dam is a complicated saturated-unsaturated question of coupling seepage-consolidation. The article deduces saturated-unsaturated seepage differential equation, control equation and definite conditions in tailings dam, and explains the types of boundary conditions and the selection method, and discusses the acquisition of related parameters in model calculation.Tailing is complicated porous material made up of three phases, solid, liquid (water), and gas, whose states and interactions have important influences on the physicochemical properties and strengths of the tailing. Among them, the uppermost interaction happens between water and solid. Water-solid interaction and dam seepage field are inseparable. On the basis of the characteristic of porous materials, the paper studies the water-soil interaction between the tailing particles, and introducing the theory of water-soil interaction into the tailing dam seepage analysis, the interaction is classified into four types, water-soil physical interaction, water-soil chemical interaction, seepage action, and the modals of physical, chemical and seepage coupling action, then introduces the types, characteristics and the control factors of their respective action. As for the dam stability, first attempting to start off from micro mechanism, and considering the effect of chemical fields, proposes the mechanism of chemical interaction on the basis of chemical kinetics and relevant experiments.Heshangyu tailing dam is a typical upstream dam, the author collects the relevant data of terrain, geology and hydrology, the relevant parameters of permeability coefficient, bulk density, cohesion, friction angel, void ratio and so on, and then proposes the problem of tailing suction under the condition of water-soil interaction. Coupling the effect of interaction into the tailing suction, applying the representative soil-water characteristic curve (SWCC), the permeability coefficient function under water-soil interaction is established based on the engineering practical data. Applying the function modal, the seepage field simulation is made by the geotechnical engineering finite element software Phase.Beneficial discussions on the aspect of water-soil interaction in the seepage field gives theoretical reference for the micro effect mechanism of the tailing particles, and provide a new train of thought on disaster-causing mechanism of the tailing dam. In China, the relevant study is in its first stage, the systemic research is of great reference value to the perfect coupling analysis of structure safety and environment stability in tailing dam engineering, and is of great theoretical significance and practical value to development of dam design and hazard control.