断层走向对隧道地震响应影响的振动台试验研究
发布时间：2018-10-22 10:02
【摘要】：为探讨不同断层走向下隧道在地震作用时的响应规律及破坏机理,开展了振动台模型试验及数值分析,研究了隧道的加速度反应、动应变及围岩动土压力的变化规律和隧道的动态破坏形态。分析结果表明:地震下隧道衬砌将受较大的拉、压作用,尤其穿越断层处隧道衬砌张拉裂缝分布数量多、复杂,多集中于拱脚、拱肩和仰拱;隧道各部位的加速度和动应变的时程变化规律与输入的地震加速度时程曲线基本保持一致,说明隧道在地震过程中保持整体运动性,但断层对地震动力反应具有一定的放大效应,且随着断层走向与隧道夹角减小而更加明显;动土压力伴随地震荷载作用呈现动力时程变化规律,动土压力幅值整体呈"两侧大、顶底小"的规律,且断层走向对隧道动土压力影响较大。研究结果可为隧道的抗震设计和施工提供参考,具有重要的实际工程意义。
[Abstract]:In order to study the response law and failure mechanism of tunnel under different fault strike, shaking table model test and numerical analysis were carried out, and the acceleration response of tunnel was studied. The variation of dynamic strain and dynamic earth pressure of surrounding rock and the dynamic failure pattern of tunnel. The results show that the tunnel lining will be subjected to large tension and compression under earthquake, especially the tensile cracks in tunnel lining will be distributed in a large number, complex and concentrated on arch foot, arch shoulder and inverted arch. The time-history variation of the acceleration and dynamic strain in every part of the tunnel is basically consistent with the input seismic acceleration curve, which indicates that the tunnel maintains the overall motion during the earthquake. However, the fault has a certain magnification effect on seismic dynamic response, and becomes more obvious with the decrease of the angle between fault strike and tunnel, and the dynamic time history of the dynamic earth pressure accompanied by the earthquake load appears, and the amplitude of the dynamic earth pressure is large on both sides. The rule of "small top and bottom" and fault strike have great influence on the dynamic earth pressure of tunnel. The results can provide reference for the seismic design and construction of the tunnel, and have important practical significance.
【作者单位】： 重庆交通大学土木工程学院;后勤工程学院军事土木工程系;
【基金】：重庆市基础科学与前沿技术研究专项资助(cstc2015jcyj A30017) 江西省交通运输厅科技项目(2014Y0009) 重庆市教委科学技术研究项目(KJ1500534)
【分类号】：U451.5
本文编号：2286857
[Abstract]:In order to study the response law and failure mechanism of tunnel under different fault strike, shaking table model test and numerical analysis were carried out, and the acceleration response of tunnel was studied. The variation of dynamic strain and dynamic earth pressure of surrounding rock and the dynamic failure pattern of tunnel. The results show that the tunnel lining will be subjected to large tension and compression under earthquake, especially the tensile cracks in tunnel lining will be distributed in a large number, complex and concentrated on arch foot, arch shoulder and inverted arch. The time-history variation of the acceleration and dynamic strain in every part of the tunnel is basically consistent with the input seismic acceleration curve, which indicates that the tunnel maintains the overall motion during the earthquake. However, the fault has a certain magnification effect on seismic dynamic response, and becomes more obvious with the decrease of the angle between fault strike and tunnel, and the dynamic time history of the dynamic earth pressure accompanied by the earthquake load appears, and the amplitude of the dynamic earth pressure is large on both sides. The rule of "small top and bottom" and fault strike have great influence on the dynamic earth pressure of tunnel. The results can provide reference for the seismic design and construction of the tunnel, and have important practical significance.
【作者单位】： 重庆交通大学土木工程学院;后勤工程学院军事土木工程系;
【基金】：重庆市基础科学与前沿技术研究专项资助(cstc2015jcyj A30017) 江西省交通运输厅科技项目(2014Y0009) 重庆市教委科学技术研究项目(KJ1500534)
【分类号】：U451.5
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