论文部分内容阅读
以西南高烈度地震区某拟建隧道为背景,开展了隧道洞口段抗减震振动台模型试验研究。通过对有无减震层体系的对比试验,研究了减震层的减震效果;并针对目前振动台试验普遍采用的多次加载方案产生的损伤累积问题进行了分析,同时给出了围岩和衬砌的裂纹发展过程及破坏形态。结果表明:在围岩与隧道之间设置减震层可以有效减弱围岩与结构之间的动力相互作用,从而起到减震效果;在评价结构抗震性能时需要考虑多次加载产生的损伤累积和裂纹效应的影响。研究结果可为结构在地震作用下的开裂分析提供参考。
Taking a proposed tunnel in high seismicity area of southwest China as a background, the anti-vibration shaker model test of tunnel entrance section was carried out. The damping effect of the shock-absorbing layer was studied through the contrast test of the system with or without the damping layer. The damage accumulation problem caused by the multi-loading scheme commonly used in the current shaking table test was analyzed. At the same time, And lining crack development process and damage morphology. The results show that the damping layer can effectively reduce the dynamic interaction between the surrounding rock and the structure so as to achieve the damping effect. The seismic damage performance of the structure should be considered when evaluating the seismic performance of the structure. And crack effects. The results can provide a reference for the crack analysis of structures under earthquake action.