| 爆破冲击荷载作用下中隔墩岩体的动力响应与局部破坏机制 |
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| 引用本文： | 张乐,卢文波,周俊汝,胡英国,陈明,严鹏.爆破冲击荷载作用下中隔墩岩体的动力响应与局部破坏机制[J].岩土力学,2014,35(Z2):520-527. |
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| 作者姓名： | 张乐 卢文波 周俊汝 胡英国 陈明 严鹏 |
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| 作者单位： | 1.武汉大学 水资源与水电工程科学国家重点实验室，武汉 430072；2.武汉大学 水工岩石力学教育部重点实验室，武汉 430072 |
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| 基金项目： | 国家杰出青年基金（No. 51125037）；国家重点基础发展计划(973)项目（No. 2011CB013501）；国家自然科学基金（No. 51279135）。 |
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| 摘 要： | 针对两侧深槽一侧已开挖形成临空面的中隔墩爆破开挖，分析了爆破冲击荷载作用下中隔墩岩体产生的振动、应力、位移等动力响应，并改善了爆破开挖方式，优化了开挖程序。研究表明，爆破冲击荷载作用下中隔墩岩体的动力响应是由于爆破应力波的反射与叠加；通过选取适当的预留岩体厚度，可以合理地利用爆破应力波的反射与叠加，削弱爆破冲击荷载作用下中隔墩的动力响应，进而降低中隔墩因爆破开挖出现动力失稳的风险，其研究成果对工程实践具有重要的指导意义。
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| 关 键 词： | 中隔墩 应力波 反射 叠加 |
| 收稿时间： | 2014-03-05 |
Dynamic response and local failure mechanism of division pier under blasting impact load |
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| ZHANG Le,LU Wen-bo,ZHOU Jun-ru,HU Ying-guo,CHEN Ming,YAN Peng.Dynamic response and local failure mechanism of division pier under blasting impact load[J].Rock and Soil Mechanics,2014,35(Z2):520-527. |
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| Authors: | ZHANG Le LU Wen-bo ZHOU Jun-ru HU Ying-guo CHEN Ming YAN Peng |
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| Institution: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, China |
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| Abstract: | Concerning on the blasting excavation of division pier where free face has formed as one side of the deep trough was excavated, in order to study the effect of blasting on the division pier, dynamic responses of vibration, stress and displacement of the division pier were analysed under blasting impact load. In addition, both the blasting excavation way was improved and the excavation procedure was optimized. The study shows that the division pier dynamic responses under blasting impact load are caused by the reflection and superposition of blasting stress wave. So selecting proper reserved rock thickness could reasonably utilize this reflection and superpositon to impair dynamic responses of the division pier under blasting impact load and consequently the resulting dynamic unstability risk is also reduced. This research result has guiding significance on engineering practice. |
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