山岭隧道洞口段设置减震层的振动台模型试验研究

发布时间：2018-10-08 22:00

【摘要】：为了解减震层在地震过程中对隧道衬砌及围岩仰坡动力响应的影响,针对山岭隧道洞口段开展振动台物理模型试验研究,模型试验按有无减震层分为两组工况。试验结果表明:减震层的存在可以有效减弱洞口段衬砌加速度与位移的放大效应,减弱围岩振动向衬砌的传递;衬砌的应变反应在设置减震层后明显减小,特别是应变反应较大的两侧拱肩和拱脚位置,减震层的设置使衬砌的动应变接近均匀,随着地震次数的增加,减震层并不会失效,减震效率反而会有所增强;而减震层的设置不能改变围岩的加速度反应,坡面随高程的放大效应依然明显,较易发生局部的滑塌破坏,特别是高位滑塌,但坡面均为浅层破坏,不会对衬砌产生附加荷载作用,但需要注意的是滑塌的围岩会掩埋洞口,将严重影响隧道的正常使用。
[Abstract]:In order to understand the influence of the damping layer on the dynamic response of tunnel lining and surrounding rock in the course of earthquake, the physical model test of shaking table is carried out for the tunnel entrance section of mountain tunnel. The model test is divided into two groups according to whether there is a damping layer or not. The test results show that the presence of the damping layer can effectively weaken the amplification effect of acceleration and displacement of the lining in the opening section of the tunnel and the transmission of the surrounding rock vibration to the lining, and the strain response of the lining decreases obviously after the installation of the damping layer. Especially in the position of arch shoulder and arch foot with high strain response, the dynamic strain of lining is close to uniform with the setting of damping layer. With the increase of earthquake frequency, the damping layer will not fail, and the damping efficiency will be enhanced. However, the acceleration response of surrounding rock can not be changed by the setting of damping layer. The amplification effect of slope with elevation is still obvious, and it is easy to occur local collapse damage, especially high collapse, but the slope surface is shallow layer failure. There is no additional load on the lining, but it is important to note that the cavernous wall rock will bury the hole, which will seriously affect the normal use of the tunnel.
【作者单位】：北京工业大学建筑工程学院;
【基金】：国家自然科学基金资助(41202221)
【分类号】：U453.1;U452.28

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