| With land mineral resources being used up by human beings, we understood the ocean more and more,Today exploiting and using the ocean resources is being attached more and more importance to many countries and has been taken as a basci national policy by many countries, The 21c-entury wil] be the age of ocean economy, and oceanic mining was the foreland of ocean high - tech and the pioneer - spot for exploiting resources.Deep - sea cobalt enriching crust is a polymetallic mineral widely spreaded at flat Seamounts ranged from 5 hundred to 3 thousand meters , which is abundant with Cobalt, Argentine, Copper, Gold, Platinum, Antimony, Lanthanum and so on. Because of the huge economic importance and im-portanl tactic significance, Cobalt crust has been a hotspot in the investigation and research of oceanic polymetallic mineral resources. Because of the deep - sea environment complexity, we can only make use of analogue model experiment and the technology of digital simulation to study colalt collection model equipment on land, simulation material for colalt crust is cut by model cutting head of coblal crust. The result of Model experiment will be used to value and optimize the cutting head. The study of simulation material is a key for ≤cobalt collection Model key technology and Equipment Research≥ . In this paper, the basic questions for simulation Material such as interface micrographs and structure, interface mechanical behavior and interface deposit of cobalt crust are studied by the use of the theories of DLA, fractal mechanical and the principles of interface physics, interface chemstry, interface mechanics. The results we have got are as follows.( 1 ) The SEM , OM is used to study the interface morphologies of crust - substrate and Crust -Liquid, with the finding that there exist Quasi - ordered "Tips" (tall conical hillocks) on the surface of the crust - Liquid and the morphologies of this tips have fractal characteristics which can be genus in the course of formation and that the interface microstructure of crusts - rock varies with the substrate rock. The cobalt - crusts formation direction along the tip is the results of layer crust' s adding layer over another which are vertical tall conical hillocks, indicating the microstructure mechanism of cobalt crust mechanical behavior.(2) The stress Wave theory is used to study the stress effect of crust - substrate rock, with the results that the interface of crust - rock is a breaking plane with the greatest stress on the interface of crust - rock, indicating that the interface of crust and substrate rock has a very good breaking characteristic under the effect of stress waves Hence, We proposes that the depth of cutting can be less than the crust layer in order to decrease dilution and proposes the making principle of simulation material interface.(3) The physical and mechanical parameters of cobalt crust and substrate rock are obtained through experiment, the fact that the varation of the sea - water presure have no great impact on the crust Mechanical parameters of deep - sea samples gathered with th velocity of less than l0m/s is verified in theory.(4) The fractal characteristice of fissure in substrate rock, of cobalt crust are studied on the? 3 ?as of fractal theory by the use of sample from deep - sea.The results show that the fissure network of rock can be classified into two growps: (a) polygon fissure; (b) branch fissure.The paper discusses the fissure mechanism of substrate rock mechanical behavior characteristics.(5) The ideal factral model of rock breaking is proposed based on Griffith theory and fractal theoiy. The paper discusses the physical mechanism of scale effects on the strength of cobalt crust and substrat rock and paper proposes the best method to forecast the great strength of rock and crust. Through experiment the result is inferred and verified in some other ways that the of substrate rock is less than l00MPa, and the of cobalt crust is less than 21MPa.(6) The frequence design method for compressive strength...
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