| As an important emergency hedging equipment in coal mine, the refuge chamber cabin's performance and its mounting location are the key issues to ensure the safety of the workers after an accident. Currently, the normal mine refuge chamber cabin's emergency exit is quite unitary and it is unable to open the door when flooding accident occurred. Our research group has designed a water proof rescue cabin which can effectively solve such problems, but the survival space is small, the cabin skin is thick. Aiming at the above problems, this paper designed a new type of refuge chamber with emergency escape hatches in the side face and the top of the life supporting compartment, and the safety performance of the cabin structure were analyzed via the numerical simulation. According to its stress and strain distribution regularities, different optimization solutions were adopted and the antiknock performance of the refuge chamber were analyzed using, then a low cost and high antiknock performance refuge chamber cabin were obtained. Based on the above research work, the possible installation positions of the refuge chamber cabin were analyzed using numerical simulation,which can ensure the safety of the refuge chamber during its application process and improve the chances for the underground workers to escape. And this paper aims to provide a certain theoretical reference for the underground refuge chamber cabin's design and installation. The specific research contents are as follows:(1)According to the functional characteristics and design requirements of mine refuge chamber, the present mine refuge chamber structure has problems like emergency exit is unitary, door may not open when flooding accident occurred and other safety problems, a new type of refuge chamber which has emergency escape hatches in the side and the top of the life supporting compartment was designed. ANSYS / LS-DYNA software was used for numerical simulation of the new type of refuge chamber cabin. Then the stress and strain distribution regularities of the cabin and the maximum stress value of the cabin's dangerous position were obtained. Then the overall structural safety performance were analyzed.(2)To considerate the antiknock performance and the cost of the refuge chamber comprehensively, the whole and some parts of the refuge chamber cabin were optimized.Then, by comparing and analyzing the advantages and disadvantages of the different optimization schemes, we obtained a refuge chamber structure with better performance price ratio. Among which, all cabin are evenly arranged with stiffeners in the overall optimization scheme and some parts installed greater density stiffeners in local optimization scheme only in severe deformation of the cabins, separately carried on the numerical simulation of these two schemes using software ANSYS / LS-DYNA, the comparative analysis of two kinds of cabin's antiknock performance was conducted, the overall optimization scheme of refuge chamber cabin was proved to be costless, and with higher antiknock performance.(3)Focused on the structure optimized refuge chamber, the refuge chamber's installation position in practical use was analyzed. According to the provisions of the “State Administration of Work Safety”, the maximum installation distance was calculated by analyzing the psychological and physiological reaction of the staff after the accident. This paper combined TNT equivalent substitute method with numerical simulation method, using software AUTODYN and ANSYS/LS-DYNA to simulate the cabin's safety performance while at different distances in the excavation working face, the minimum critical installation distance from the working face was determined, which can provide a theoretical basis for the practical use of the rescue chamber. |
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