隧道高陡仰坡抗震性能振动台试验分析

发布时间：2018-02-25 03:19

本文关键词： 隧道工程仰坡防护模型试验振动台试验抗震措施水平地震　出处：《振动与冲击》2017年19期 　论文类型：期刊论文

【摘要】：汶川地震以来,统计发现山岭隧道洞口段受地震破坏较为严重,为了提高山岭隧道洞口段抗震性能,研究可靠的仰坡加固措施,设计并完成了高烈度震区隧道洞口段仰坡抗震性能振动台试验。研究发现:(1)在洞口段仰坡不设防的情况下,均质岩质高陡仰坡在高烈度水平地震作用下,仰坡发生破坏,大量岩土体滑落,此时落石会严重影响隧道结构与运营安全,必须对仰坡进行加固;(2)设置框架梁形式的仰坡支护体系后,即使在高烈度水平地震作用下,只要支护体系没有破坏,均质岩质仰坡整体仍能保持相对完整,仅框架梁内部有少量掉块,提高了仰坡整体的抗震性能;(3)对比洞口段衬砌结构的截面内力,可以看出,设置了框架梁形式的仰坡支护体系后,可以显著降低洞口段衬砌结构的截面轴力与弯矩。综合分析,可以看出由于设置了框架梁支护体系,仰坡岩体整体性增强,限制了仰坡处岩体的自由运动,进而有效防止了仰坡破坏,并降低了洞口段衬砌的内力。
[Abstract]:Since the Wenchuan earthquake, it has been found that the tunnel entrance section of the mountain tunnel has been damaged seriously by the earthquake. In order to improve the seismic performance of the tunnel entrance section, the reliable reinforcement measures of the vertical slope are studied. The shaking table test of seismic behavior of elevation slope of tunnel entrance in high intensity seismic region was designed and completed. The study found that under the condition that the elevation of tunnel entrance is not protected, the high and steep vertical slope of homogeneous rock is destroyed under the action of high intensity level earthquake. When a large amount of rock and soil falls, the rock fall will seriously affect the tunnel structure and operation safety. Therefore, it is necessary to reinforce the vertical slope of the vertical slope with the support system of frame beam, even under the action of high intensity horizontal earthquake. As long as the support system is not destroyed, the whole of the homogeneous rock slope can remain relatively intact, only a small amount of falling blocks are found in the frame beam, which improves the seismic performance of the whole vertical slope, and contrasts the cross section internal force of the lining structure of the opening section, and it can be seen that, The axial force and bending moment of the lining structure can be significantly reduced by setting the support system of the frame beam, and it can be seen that because of the frame beam supporting system, the whole rock mass of the upslope can be enhanced. The free movement of rock mass at the upslope is restricted, and the failure of the upside-slope is effectively prevented, and the internal force of the lining is reduced.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;石家庄铁道大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178398;51678501)
【分类号】：U451.5

【相似文献】