杨仁树,丁晨曦,杨立云,张永新,李炜煜

• 1:中国矿业大学(北京)力学与建筑工程学院
• 2:中国矿业大学(北京)深部岩土力学与地下工程国家重点试验室

摘要(Abstract)：

采用以有机玻璃(PMMA)为材料的模型试验方法,分析了试件的破坏形态和裂纹尖端的应力特征,研究了对向切槽炮孔的不同竖向间距对爆生裂纹扩展的影响。结果表明:爆生裂纹扩展过程中,裂纹速度震荡减小,裂纹尖端应力变化经历两个阶段,Ⅰ阶段(0~110μs)裂纹尖端动态应力强度因子迅速减小,试件破坏以拉伸破坏为主;Ⅱ阶段(110μs~止裂)裂纹尖端动态应力强度因子先增大后减小,试件破坏兼有拉伸破坏和剪切破坏。炮孔的竖向间距的不同对爆生裂纹Ⅰ阶段扩展影响不大,对Ⅱ阶段扩展影响显著。对向裂纹起到自由面作用并引导己方裂纹向其发生偏转,从对向裂纹面处反射的应力波加强了己方裂纹尖端的应力集中。

关键词(KeyWords)： 爆生裂纹;动态应力强度因子;拉伸破坏;剪切破坏;应力波

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金-煤炭联合基金重点项目(51134025);; 深部岩土力学与地下工程国家重点实验室自主重点课题(GDUEZB201401)

作者(Author): 杨仁树,丁晨曦,杨立云,张永新,李炜煜

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