| 隧道围岩爆破损伤防护的霍普金森压杆试验 |
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| 引用本文： | 代仁平,郭学彬,宫全美,蒲传金,张志呈.隧道围岩爆破损伤防护的霍普金森压杆试验[J].岩土力学,2011,32(1):77-83. |
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| 作者姓名： | 代仁平 郭学彬 宫全美 蒲传金 张志呈 |
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| 作者单位： | 1. 同济大学,道路与交通工程教育部重点实验室,上海,201804
2. 西南科技大学,环境与资源学院,四川,绵阳,621010 |
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| 基金项目： | 西南科技大学重大科技成果培育项目(No. 06cgzx02)。 |
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| 摘 要： | 为减小爆破对隧道围岩的损伤，在传统光面爆破装药结构基础上，设计一种在炮孔一侧安放PVC-U材料来保护隧道围岩的装药结构，并分析了该方法的作用机制。为分析和验证PVC-U管对隧道围岩损伤的防护效果，利用Φ100 mm的霍普金森试验装置进行隧道围岩损伤防护试验，从试件宏观破坏、应力波衰减和能量变化3方面进行了分析。结果表明：防护材料改变了岩石的受力状态，当防护材料厚度从0增加到6.24 mm时，无防护材料的试件的破坏程度比有防护材料的试件严重，且随着防护材料厚度的增加破坏程度不断减小；试件的应力峰值呈不断降低趋势；应力峰值的降低率不断增加；耗散能与入射能比值从61.08%下降到39.97%。可见，防护材料对岩石冲击损伤具有一定防护作用。该方法在某巷道掘进中得到应用，并取得了良好效果。
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| 关 键 词： | 隧道围岩 爆破 损伤防护 分离式霍普金森压杆 防护材料 |
| 收稿时间： | 2009-12-21 |
SHPB test on blasting damage protection of tunnel surrounding rock |
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| DAI Ren-ping,GUO Xue-bin,GONG Quan-mei,PU Chuan-jin,ZHANG Zhi-cheng.SHPB test on blasting damage protection of tunnel surrounding rock[J].Rock and Soil Mechanics,2011,32(1):77-83. |
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| Authors: | DAI Ren-ping GUO Xue-bin GONG Quan-mei PU Chuan-jin ZHANG Zhi-cheng |
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| Institution: | 1. Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China; 2. School of Environment and Resources, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China |
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| Abstract: | In order to decrease the blasting damage to tunnel surrounding rocks, a new charging structure and its mechanism are proposed based on the traditional smooth blasting charging structure. The PVC-U material is placed beside the burn-cut cavities to protect the surrounding rocks of the tunnel. The Φ100 mm Hopkinson test equipment is used for the purpose of researching the weakening level of the PVC-U pipe. The analysis is made on macroscopic damage of the test sample, attenuation of stress wave and dissipation of energy respectively. The test results show that: the stress state of rock is changed by the protective layer and the damage of the rock without protective layer is worse than that with the protective layer; and as increasing of the thickness of protective layer from 0 to 6.24 mm, the degree of rock damage decreases; the stress peak shows decreasing trend; and the reduction rate of peak stress value increases instantly. The ratio of dissipation of energy and the incident is reduced from 61.08% to 39.97%. Thus the conclusion can be drawn that the impact damage of rock is protected by the protective layer. Good results have been obtained in a roadway excavation project. |
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| Keywords: | tunnel surrounding rock blasting damage protection split Hopkinson pressure bar protective layer |
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