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| 埋深对岩溶隧道地震动力响应影响分析 |
| Analysis on the influence of buried depth on seismic dynamic response of karst tunnel |
| 投稿时间：2019-09-24 修订日期：2019-11-23 |
| DOI： |
| 中文关键词: 埋深 溶洞 动力响应 第一主应力 |
| 英文关键词: buried depth karst cave dynamic response first principle stress |
| 基金项目:国家自然科学基金面上项目(51778109)；中铁二十四局集团福建铁路建设有限公司科研项目(GY-H-15034)；中铁第一勘察设计院集团有限公司科研项目(院科16-19-1) |
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| 中文摘要: |
| 基于工程波动理论，应用ABAQUS数值模拟和理论解析方法，研究了溶洞中心与隧道中心处于同一水平时，埋深对岩溶隧道地震动力响应影响规律，并对比分析地震作用下有无溶洞时隧道的反应差异性。分析结果表明：岩溶隧道和非岩溶隧道发生较大位移的部位均为拱肩和拱脚；溶洞对隧道地震动有缓冲作用；岩溶隧道埋深越浅，地震动力响应位移越大；在地震作用下，隧道二次衬砌第一主应力较集中的部位是拱脚。埋深15m时第一主应力最大，埋深100m时第一主应力最小；埋深100m时，岩溶隧道比非岩溶隧道的第一主应力小，说明溶洞对隧道岩体有一定的应力释放作用。 |
| 英文摘要: |
| Based on the engineering wave theory, ABAQUS numerical simulation and theoretical analysis method are applied to study the influence rule of buried depth on the seismic dynamic response of karst tunnel when the karst cave center and tunnel center are at the same level.The results show that the large displacement of karst tunnel and non-karst tunnel is the arch shoulder and arch foot.The karst cave can buffer the ground motion of the tunnel.The shallower the buried karst tunnel is, the larger the seismic dynamic response displacement is.Under the action of earthquake, the first main stress of the secondary lining of the tunnel is the arch foot.The first principal stress is the highest when the depth is 15m and the lowest when the depth is 100m.When the buried depth is 100m, the first principal stress of karst tunnel is smaller than that of non-karst tunnel, which indicates that karst tunnel has a certain stress release effect on tunnel rock mass. |
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