爆炸冲击荷载下相邻巷道裂隙扩展机理模拟试验

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (2) : 178-183.

论文

郭东明1,2，刘康1，杨仁树1,2，李元1

作者信息 +

The simulation experiment about mechanism of adjacent tunnel crack extension induced by explosion impacting load

GUO Dong-ming1,2，LIU Kang1，YANG Ren-shu1,2，LI Yuan1

Author information +

文章历史 +

摘要

为探究邻近巷道裂纹缺陷受爆炸荷载作用的扩展机理，采用透射式动态焦散线实验系统进行模拟实验。结果表明，对迎爆侧隐性裂纹，当裂纹与巷道左壁相对距离10 mm时，裂纹右尖端扩展因巷道的存在使预制裂纹导向作用更显著，引导爆生主裂纹与预制裂纹左尖端贯穿，衍射后作用于右尖端反射拉伸引起；对背爆侧隐性裂纹，当裂纹与巷道右壁相对距离4 mm时，裂纹扩展源于薄弱的巷道临空面将绕射的应力波能传递并导向裂纹缺陷，裂纹受拉扩展贯穿。巷道存在会增加其围岩裂纹缺陷处动应力集中，在爆炸应力波作用下会诱发裂纹扩展。

Abstract

In order to explore mechanism of extension of the nearby crack defects in the roadway under explosion load, transmission type dynamic caustics experimental system is adopted to carry out the simulated experimental study. The experimental results show that the propagation mechanism of recessive crack which is located at meeting-blast side results from that the existing tunnel makes the leading effect of prefabricated crack more notable, which guides the propagation crack from the explosive source meets the left cutting-edge of prefabricated crack and diffract to the right cutting-edge, the right cutting-edge start to extend under the stretching influence of diffraction wave, when the distance between the prefabricated crack and the left panel of tunnel is 10 mm. For prefabricated recessive crack of back-blast side, when the spacing between the prefabricated crack and the right panel of tunnel is 4 mm, the expansion of crack result from that weak free surface of roadway guides the diffraction stress wave to crack defects, crack extends subjected to tensile stress. Compare the prefabricated crack extension condition when roadway exists with that of no roadway, the existing roadway increases dynamic stress concentration at the crack defects, inducing crack extension under the effect of the explosive stress wave.

导出引用

郭东明1,2，刘康1，杨仁树1,2，李元1. 爆炸冲击荷载下相邻巷道裂隙扩展机理模拟试验[J]. 振动与冲击, 2016, 35(2): 178-183

GUO Dong-ming1,2，LIU Kang1，YANG Ren-shu1,2，LI Yuan1. The simulation experiment about mechanism of adjacent tunnel crack extension induced by explosion impacting load[J]. Journal of Vibration and Shock, 2016, 35(2): 178-183

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