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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。
In this paper, the dynamic photoelasticity method is used to analyze the dynamic stress distribution and dynamic stress concentration coefficient around the rock cavern under the impact load. In the experiment, two types of straight wall vault holes were studied for rules and non-current situations. With drop weight loading, the microflash system records test data. The stress distribution around the caverns at several specific moments after impact loading is given. The test results show that the dynamic stress concentration factor of the cavern is related to the hole type. The area of stress disturbance caused by the cavern expands from the center of the hole to the four sides to a distance of about 1.5 times the maximum feature size from the center of the hole.