突出冲击波对防突风门的破坏失效研究*

为了分析煤与瓦斯突出事故中防突风门的安全性，同时降低成本寻求对现有防突风门材料和结构的替代方案，研究不同厚度的Q460钢制防突风门在突出冲击波载荷下的破坏情况。基于能量法得到不同厚度的风门最大挠度数学模型，再根据煤炭行业规定中的对应数据和安全要求，运用LS-DYNA软件对冲击载荷下的风门破坏进行数值模拟，得到Q460钢制防突风门的静力学特征并与能量法结果进行比对。结果表明:长宽分别为1.75 m和1.8 m，厚度为25 mm和30 mm的风门在0.6 MPa的冲击波超压作用下能满足安全要求，能量法计算结果与数值模拟误差在9%以内，基于安全设计余量可以接受；提出挠厚比概念，当挠厚比小于0.84时，风门不会被破坏，在使用Q460钢设计防突风门时，应尽量确保该值小于0.84。

Research on damage failure of outburst prevention air door under outburst shock wave

In order to analyze the safety of outburst prevention air door in the coal and gas outburst accident,and reduce the cost and seek the alternative solutions to the existing materials and structures of outburst prevention air door at the same time,the damage of outburst prevention air door made of Q460 steel with different thicknesses under the load of outburst shock wave was studied.Based on the energy method,a mathematical model for the maximum deflection of outburst prevention air door with different thicknesses was obtained,and combined with the corresponding data and safety requirements stipulated by the coal industry,the LS-DYNA software was used to numerically simulate the failure of outburst prevention air door under the impact load,then the static characteristics of outburst prevention air door made of Q460 steel were obtained and compared with the results of the energy method.The results showed that the outburst prevention air door with the length of 1.75 m,the width of 1.8 m and the thickness of 25 mm and 30 mm respectively could satisfy the safety requirements under the action of 0.6 MPa shock wave overpressure,and the error range between the results of energy method and the numerical simulation was within 9%,which was acceptable based on the safety design margin.The concept of deflection thickness ratio was proposed.When the deflection thickness ratio was less than 0.84,the outburst prevention air door would not be damaged.When the Q460 steel was used to design the outburst prevention air door,this value should be less than 0.84 as far as possible.