| 杨鑫,蒲传金*,肖定军,肖正学,朱强.不同方位裂隙对爆炸裂纹扩展的影响[J].实验力学,2014,29(6):751~759 |
| 不同方位裂隙对爆炸裂纹扩展的影响 |
| On the Effect of Cracks with Different Orientation on the Propagation of Blast-Induced Cracks |
| 投稿时间：2014-05-04 修订日期：2014-07-03 |
| DOI：10.7520/1001-4888-14-087 |
| 中文关键词: 预制裂隙 爆生裂纹 翼裂纹 裂纹密度 扩展机制 |
| 英文关键词:prefabricated crack blast-induced crack wing crack crack density propagation mechanism |
| 基金项目:四川省教育厅青年基金项目(项目编号：11ZB194/11ZD1009);西南科技大学研究生创新基金资助(项目编号：13ycjj27) |
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| 中文摘要: |
| 为研究裂隙岩体爆炸动载荷作用下裂纹扩展规律，实验采用有机玻璃模型，以炮孔和裂隙相对位置为变量，通过单发雷管加载模型进行相似物理实验。结果表明，当预制裂隙右端圆弧顶点到炮孔中心连线与模型中间穿过炮孔中心的横虚线的夹角θ为0°和90°时，爆生裂纹数量相对较多，45°时爆生裂纹数量最少，但平均长度最长;每组模型总裂纹平均长度在裂隙右端半圆弧顶点到炮孔中心距离L为40mm时达到最大值;0°组各模型最长裂纹均分布在炮孔右侧，而45°和90°组则多分布于炮孔下侧;固定区域内爆生裂纹密度大多小于不定区域内裂纹密度;所有模型预制裂隙两端都能形成翼裂纹，同组模型同端扩展路径相似;L为20～30mm时两端翼裂纹扩展方向一致，L为40～60mm时两端翼裂纹扩展方向多相反;爆生裂纹扩展机制随角度θ变化而有所不同。研究结果可为裂隙岩体爆破设计及爆破参数优化等提供理论依据。 |
| 英文摘要: |
| In order to study the crack propagation induced by blast load in joint rock mass, an experimental scheme was proposed by taking relative position between blast hole and crack as variable, adopting plexiglass as model material and loading model by single detonator. Results show that when angle θ equals to 0°or 90°, the number of blast-induced crack is relatively large; when angle θ equals to 45°, the number of blast-induced crack is minimum, but the average length is the longest. The average length of total cracks in each model reaches the maximum value when L equals to 40mm. The longest cracks of each model in group 0° are all distributed on the right side of blast hole, while the longest cracks of each model in group 45° and group 90° are distributed most under blast hole. The blast-induced crack density in fixed area is less than that in area of uncertainty for most models. Wing cracks are generated on both ends of prefabricated crack in all models, and in same group, the propagation paths of wing cracks are similar. When L is in the range of 20mm to 30mm, the wing crack propagation directions on crack both ends are consistent; when L is in the range of 40mm to 60mm, the wing crack propagation directions on both crack ends is most opposite. The mechanism of blast-induced crack propagation varies with the change of angle θ. Above results may provide theoretical evidence for joint rock mass blast designe and optimization of blast parameters. |
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