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爆炸载荷下邻近硐室迎爆侧原先裂纹扩展机理研究

郭东明 刘康 罗浪 杨俊 王豪 肖正星

郭东明, 刘康, 罗浪, 杨俊, 王豪, 肖正星. 爆炸载荷下邻近硐室迎爆侧原先裂纹扩展机理研究[J]. 矿业科学学报, 2017, 2(4): 348-356.
引用本文: 郭东明, 刘康, 罗浪, 杨俊, 王豪, 肖正星. 爆炸载荷下邻近硐室迎爆侧原先裂纹扩展机理研究[J]. 矿业科学学报, 2017, 2(4): 348-356.
Guo Dongming, Liu Kang, Luo Lang, Yang Jun, Wang Hao, Xiao Zhengxin. Growth mechanism of original crack facing the blasting side of adjacent tunnel under the blasting load[J]. Journal of Mining Science and Technology, 2017, 2(4): 348-356.
Citation: Guo Dongming, Liu Kang, Luo Lang, Yang Jun, Wang Hao, Xiao Zhengxin. Growth mechanism of original crack facing the blasting side of adjacent tunnel under the blasting load[J]. Journal of Mining Science and Technology, 2017, 2(4): 348-356.

爆炸载荷下邻近硐室迎爆侧原先裂纹扩展机理研究

基金项目: 国家自然基金面上项目(51274204);教育部新世纪优秀人才支持计划(NCET-12-0965)
详细信息
    作者简介:

    郭东明(1974—),男,江西新余人,教授,博士生导师,主要从事矿井建设方面的教学和研究。

  • 中图分类号: TD23

Growth mechanism of original crack facing the blasting side of adjacent tunnel under the blasting load

  • 摘要: 为探究爆炸载荷下邻近硐室迎爆侧围岩中原先裂纹的扩展机理,采用动态焦散线方法进行了试验研究.研究发现:爆炸载荷作用下,裂纹动态断裂韧度与硐室自由面和裂纹倾角无关,但硐室自由面的存在使预制裂纹的起始扩展时间提前;迎爆侧围岩中预制裂纹的扩展方向与硐室自由面、炮孔处诱发主裂纹扩展方向以及硐室围岩应力分布特征有很大关联.预制裂纹扩展初期,由于自由面反射拉伸波的作用,裂纹近似竖向扩展;裂纹扩展中期,炮孔诱发主裂纹对应力波能释放的导向性改变了预制裂纹周边应力场,使裂纹扩展方向与主裂纹扩展方向基本平行;裂纹扩展后期,受邻近硐室自由面应力分布特征影响,裂纹扩展方向偏向于拱形部位,并最终与拱形部位贯穿.结合LS-DYNA软件,分析了爆炸载荷下邻近硐室围岩应力分布特征,从迎爆侧底角到起拱点再到拱顶,有效应力表现为先减小后增大再减小的规律.其中,极大值点位于底角、起拱点和拱顶之间位置,极小值点位于直墙位置,最终导致预制裂纹往往止裂于拱顶与起拱点之间的某一位置.
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出版历程
  • 收稿日期:  2016-11-02
  • 刊出日期:  2017-07-25

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