Abstract
With the depletion of shallow metal resources in the land, the development of seabed resources has become a new direction. In order to achieve safe and efficient exploitation of seabed metal mineral resources, a similar simulation test platform was established for seabed mining of metal minerals in this paper. Similar simulation materials and the best material ratios were selected to make simulated specimens. A series of mechanical pressurization devices and model sample were prototyped and submarine simulation mining test was conducted. During the simulation mining test, stress and strain changes and microscopic observations of crack evolution were monitored by the static strain test system. These indicators revealed the characteristics of ore-rock mechanical change in the development of submarine mental resources. By exploring the best safe thickness of seabed resource mining, it provides effective data reference for subsequent seabed resource development, so as to realize safe and efficient mining.
Highlights
After nearly 50 years of exploitation, China’s shallow metal resources in the land have been greatly mined
There are a large number of metal deposits in the submarine continental shelf with high mining efficiency, which can greatly alleviate the shortage of mineral resources in China and meet the demand of metal resources for national economic construction
The safety insulation thickness from mining layer to the seabed is a critical issue for subsea mining, and it is necessary to carry out relevant theoretical researches on the seabed mining of metal ores on the basis of mining characteristics of seafloor metal ores [2]
Summary
After nearly 50 years of exploitation, China’s shallow metal resources in the land have been greatly mined. The safety insulation thickness from mining layer to the seabed is a critical issue for subsea mining, and it is necessary to carry out relevant theoretical researches on the seabed mining of metal ores on the basis of mining characteristics of seafloor metal ores [2]. Numerical simulation methods have been applied to study the activation of fracture zones and the mechanism of water inrush in mining of seabed deposits. Evolution rules of overburden deformation and fracture were explored in seabed mining, revealing the inoculating mechanism of water inrush in undersea mining of metal ore. Water inrush criteria for seabed metal ore mining were established and a reasonable thickness of the mining isolation layer was proposed in this paper, so as to provide a theoretical basis for China’s safe mining of seabed metal ore deposits
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