【摘要】 本文用动态光弹性方法,分析冲击荷载作用下岩洞周边的动应力分布和动应力集中系数。试验中针对规则、非现则两种直墙拱顶孔洞进行研究。采用落锤加载,微闪系统记录试验资料。文中给出冲击荷载作用后几个特定时刻岩洞周边的应力分布。试验结果表明:岩洞的动应力集中系数与孔型有关。被岩洞引起的应力扰动区域,由孔中心向四方扩展到离孔中心约相当于最大特征尺寸1.5倍的地方。更多还原

【Abstract】 In the present paper the dynamic stress distribution and stress con-centration factor in the neighbourhood of caverns under impulse loadingare given by using dynamic photoelastic method. The regular and irregu-lar caverns with straight wall arch were studied. The models were loadedby falling weight. Microflash spark system was adopted to obtain records.The stress distribution in neighbourhood of the cavern at various instantsafter impact was shown in this paper. The test results indicate that dy-namicstress concentration factor of cavern is closely related with the shapeof the cavern. The stress area disturbed by the hole is approximatelythree times the maximum characteristic dimension of the hole.更多还原