Surface subsidence in the karst mining area in China

Carbonate rocks are widely distributed in China, with extensively scattering of karst aquifer deposits associated with frequent surface subsidences. Particularly, most of surface subsidences occurred in karst aquifer mining areas in Southern China, but very few in Northern China. As a form of geological hazard, the surface subsidence in mining areas causes the increasing of both the amount of mine water inundation and the possibility of mine water and mud invasion, jeoperdising the environment of mining areas, and endangering the mining operation and people’s lives. Generally, the distribution of surface subsidences is of regular pattern, principally controlled by karst development pattern. Therefore, it is likely to predict and prevent the occurrence of surface subsidence. In this paper, the distribution, the danger and the prediction and prevention of surface subsidence of karst aquifer mine area in China are discussed.     

The stability of a balloon support subjected to blasting

Journal of Mining Science -     

Experience and perspectives of application of gasdynamic coatings in space technology

The given work deals with the results of the research carried out by the “Salute“ DB of the Khrunichev State research-and-production space center concerning the development of special equipment and improvement of the technique of the “cold“ gasdynamic method of application of coating for the accomplishment of several specific tasks: (1) development of the technique of application of a fireproof heat-radiating coating to screens made from stainless steel with coefficient of thermal radiation ε≥0.7; (2) development of technique of sealing (“curing“) of microleaks on the weld joints of the propellant tanks made of aluminum alloys; (3) study of the opportunity of sealing of joints of parts made from heterogeneous materials; (4) development of process for copper and nickel coating application for aluminium heat exchangers soldering.……     

基于绿色的煤机零件加工工艺方案的选择

由于煤矿机械所处的环境比较恶劣,因此其设计与制造一般只考虑本身的性能和使用寿命。结合煤矿机械产品的特点,从绿色角度探讨了煤机零件加工工艺过程模型,建立了绿色工艺评价体系,并对带式输送机中滚筒的加工工艺进行了分析,指出了今后煤机产品绿色制造的发展趋势。