爆炸荷载对邻近巷道裂纹群影响规律动焦散试验
为了研究围岩中存在缺陷的既有巷道受邻近巷道爆破振动的影响,采用爆炸加载数字激光动态焦散线试验系统,探究了新巷道爆破开挖对邻近巷道预制裂纹群的影响规律。试验结果表明:爆炸荷载对邻近巷道围岩裂纹群的影响规律与裂纹所在位置、裂纹倾角和与邻近巷道间距L有关;当L<45 mm或L>65 mm时,巷道左壁预制裂纹与炮孔连线区域出现三角形破坏,但表现形式有所差异;当L增大时,巷道周边与应力波相切或有一定夹角的1号、3号和4号裂纹扩展现象均不明显,而其他裂纹扩展位移基本呈逐渐减少趋势;群裂纹扩展时,动态应力强度因子的变化趋势基本呈现先振荡增大到峰值,后减小,然后再增大到第2个峰值,...
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| Published in | 煤炭学报 no. S1; pp. 64 - 69 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
2014
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| Subjects | |
| Online Access | Get full text |
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| Abstract | 为了研究围岩中存在缺陷的既有巷道受邻近巷道爆破振动的影响,采用爆炸加载数字激光动态焦散线试验系统,探究了新巷道爆破开挖对邻近巷道预制裂纹群的影响规律。试验结果表明:爆炸荷载对邻近巷道围岩裂纹群的影响规律与裂纹所在位置、裂纹倾角和与邻近巷道间距L有关;当L<45 mm或L>65 mm时,巷道左壁预制裂纹与炮孔连线区域出现三角形破坏,但表现形式有所差异;当L增大时,巷道周边与应力波相切或有一定夹角的1号、3号和4号裂纹扩展现象均不明显,而其他裂纹扩展位移基本呈逐渐减少趋势;群裂纹扩展时,动态应力强度因子的变化趋势基本呈现先振荡增大到峰值,后减小,然后再增大到第2个峰值,最后振荡减小到0的规律,且当裂纹最终扩展位移越小时,这种现象越明显,伴随着裂纹呈现出扩展—止裂—快速扩展—止裂的扩展规律。 |
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| AbstractList | 为了研究围岩中存在缺陷的既有巷道受邻近巷道爆破振动的影响,采用爆炸加载数字激光动态焦散线试验系统,探究了新巷道爆破开挖对邻近巷道预制裂纹群的影响规律。试验结果表明:爆炸荷载对邻近巷道围岩裂纹群的影响规律与裂纹所在位置、裂纹倾角和与邻近巷道间距L有关;当L<45 mm或L>65 mm时,巷道左壁预制裂纹与炮孔连线区域出现三角形破坏,但表现形式有所差异;当L增大时,巷道周边与应力波相切或有一定夹角的1号、3号和4号裂纹扩展现象均不明显,而其他裂纹扩展位移基本呈逐渐减少趋势;群裂纹扩展时,动态应力强度因子的变化趋势基本呈现先振荡增大到峰值,后减小,然后再增大到第2个峰值,最后振荡减小到0的规律,且当裂纹最终扩展位移越小时,这种现象越明显,伴随着裂纹呈现出扩展—止裂—快速扩展—止裂的扩展规律。 |
| Author | 郭东明 刘康 王雁冰 杨仁树 何天宇 |
| AuthorAffiliation | 中国矿业大学(北京)力学与建筑工程学院 中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室 |
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| Notes | GUO Dong-ming;LIU Kang;WANG Yan-bing;YANG Ren-shu;HE Tian-yu;School of Mechanics and Architecture Engineering,China University of Mining and Technology( Beijing);State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology( Beijing) 11-2190/TD |
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| Snippet | 为了研究围岩中存在缺陷的既有巷道受邻近巷道爆破振动的影响,采用爆炸加载数字激光动态焦散线试验系统,探究了新巷道爆破开挖对邻近巷道预制裂纹群的影响规律。试验结果表明:爆炸荷载对邻近巷道围岩裂纹群的影响规律与裂纹所在位置、裂纹倾角和与邻近巷道间距L有关;当L<45 mm或L>65... |
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| SubjectTerms | 爆破荷载;邻近巷道;裂纹群;数字激光动态焦散线;动态应力强度因子 |
| Title | 爆炸荷载对邻近巷道裂纹群影响规律动焦散试验 |
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