大爆破对水工圆形隧洞影响的动态光弹性实验研究
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摘要
论证了大爆破对水工隧洞的作用与影响，该问题可近似按弹性平面应变问题处理分析，在此简化前提下，进行了动态光弹性模型实验研究。文中介绍了该研究的试验方法与技术特点；得出在爆炸荷载作用下全过程模型动态应力等色线条纹图，揭示与解说了隧洞的爆炸动态响应应力变化过程；求得模型隧洞拱顶最大拉应力条纹整级数Ｎ_（ｍａｘ）与隧洞直径Ｄ对隧洞至爆源距离Ｒ的比值（即Ｄ／Ｒ）之间的关系，根据试验资料与模拟相似关系，给出了爆炸条件下估算圆形隧洞最大爆炸拉应力的经验表达式，该式可供工程应用与理论分析参考。
The effect of blasting on the tunnel of the water-power engineering is discussed in this paper.It may be approximately dealt with as the elastic plane strain.The model experiment on the dynamic photoelasticity was carried out blazed on that the method and technical characteristics of the experiment are introduced.From this experiment.the dynamic isochromatic lineal fringe of the full process under the action of blasting loading can be acquired.The changable stress process of blasting dynamic response of the tunnel can be revealed and expand.The relation between the integral grade of the maximum tensile stress stripes(N_max)of the top of the tunnel and ratio of the diameter of tunnel and the distance between the tunnel and the blasting source(D/R),isalso aquired.According to the experiment materials and the similar relations,experiential formula on the maximum tensile stress of the top of the tunnel is given.The formula can be used in the engineering in analysis of theoretical parameters.
The effect of blasting on the tunnel of the water-power engineering is discussed in this paper.It may be approximately dealt with as the elastic plane strain.The model experiment on the dynamic photoelasticity was carried out blazed on that the method and technical characteristics of the experiment are introduced.From this experiment.the dynamic isochromatic lineal fringe of the full process under the action of blasting loading can be acquired.The changable stress process of blasting dynamic response of the tunnel can be revealed and expand.The relation between the integral grade of the maximum tensile stress stripes(N_max)of the top of the tunnel and ratio of the diameter of tunnel and the distance between the tunnel and the blasting source(D/R),isalso aquired.According to the experiment materials and the similar relations,experiential formula on the maximum tensile stress of the top of the tunnel is given.The formula can be used in the engineering in analysis of theoretical parameters.
引文
1朱瑞赓，李铮．爆炸地震波作用下隧道的安全距离问题．地下工程，1981，（4）：26～33．2陈斌林，刘德宝，谢剑华，章笑梅．动态光弹性实验研究总结．水利水电科学研究院科学研究论文集（第27集）．北京：水利电力出版社，1987，297～299．3陈斌林，刘德宝．动态光弹性定量实验研究及应用的初步探讨．水利水电科学研究院，1986．4苏先基，马莲芬．多火花式动态光弹性仪及其初步应用，爆炸与冲击，1984，4（1）：56～57．51973，（1）．6陈斌林，刘德宝．水工隧洞抗爆的模拟与相似关系．水利水电科学院抗震防护研究所，1990．
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