Design and optimization of an emergency shelter

Because of the increasing trend towards deeper mining tunnel, the coalminer and the extraction equipment are working under extreme conditions. In case of accident it is very difficult to rescue the coalminer under these extreme conditions. A passive defense system which must be very strong to withstand various extreme conditions was proposed to prevent harm to labor in the mining accident. The spherical shell which can provide enough rigidity and safe space is an oriental solution to design an emergency shelter. In this article the behaviors of hemispherical shell under the impact and compression condition are discussed. Under the consideration of the behavior of spherical shell some optimization method were proposed for increasing the rigidity of the top point of the shell and the type of construction of double or triple layer hemispherical shell structure is proposed.