韩雪靖1,2,楼晓明1,2,王 宝1,2,黄 慎1,2.爆炸荷载作用下共线不等长双裂纹拓展规律研究[J].有色金属(矿山部分),2018,70(4):66-72.
爆炸荷载作用下共线不等长双裂纹拓展规律研究
Propagation rules of double cracks with collinear unequal length under blasting
  
DOI:10.3969/j.issn.1671-4172.2018.04.015
中文关键词:  岩石力学  不等长双裂纹  爆破荷载  起裂角,拓展长度
英文关键词:rock mechanics  unequal double crack  blasting initiation angle  extended length
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作者单位
韩雪靖1,2 (1. 福州大学 紫金矿业学院,福州 350116
2. 福州大学爆炸技术研究所,福州 350116)
楼晓明1,2 (1. 福州大学 紫金矿业学院,福州 350116
2. 福州大学爆炸技术研究所,福州 350116)
王 宝1,2 (1. 福州大学 紫金矿业学院,福州 350116
2. 福州大学爆炸技术研究所,福州 350116)
黄 慎1,2 (1. 福州大学 紫金矿业学院,福州 350116
2. 福州大学爆炸技术研究所,福州 350116)
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中文摘要:
      为研究爆破应力波作用下裂隙岩体破坏规律,基于经典Kachanov法,推导共线不等长裂纹尖端静态应力强度因子,结合断裂力学原理得出动载荷作用下耦合应力强度因子与比例系数的关系,并通过模型试验对不同应力波入射角、不同裂纹长度、不同裂纹间距等情况进行验证。试验结果表明,应力波入射角、共线裂纹长度及裂纹间距是影响裂纹拓展的重要因素;裂尖起裂角随应力波入射角的不同而变化;端部比例系数与裂纹拓展长度变化趋势相同;次裂纹长度越大、裂纹间距越小,裂尖拓展长度越长;当间距大于1.2倍次裂纹长度,不再影响裂尖拓展。
英文摘要:
      In order to study the failure law of fractured rock under blasting stress wave, based on classical Kachanov’s method, the static stress intensity factor at the tip of collinear unequal length crack is derived, and the relationship between the coupling stress intensity factor and the coefficient under dynamic load is obtained with the principle of fracture mechanics. And the theory is verified with different incident angle of stress wave, different crack length and different crack spacing through the model test. The experimental results show that the incidence angle of stress wave, the length of collinear crack and the crack spacing are the important factors that affect the crack propagation. The crack initiation angle varies with the incident angle of the stress wave. The trend of the coefficient is the same as the crack expansion length. The greater the length of the secondary crack and the smaller the crack spacing, the longer the length of the crack tip expands. When the length of the crack is greater than 1.2 times the crack length, it no longer affects the crack tip expansion.
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