非均匀地层盾构隧道纵向抗震分析

发布时间：2018-01-11 10:08

本文关键词：非均匀地层盾构隧道纵向抗震分析　出处：《现代隧道技术》2016年06期 　论文类型：期刊论文

【摘要】：盾构隧道纵向刚度相比于横向刚度小,地震作用下容易因过大的变形而产生震害,特别是在地层或结构本身发生突变的部位,纵向抗震问题更加值得关注。文章采用地层-结构模型,基于纵向等效刚度模型计算了不同地震作用下隧道纵向动力响应,并对纵向转角、管片及接头螺栓应力等抗震指标进行了验算。计算结果表明:软硬突变地层是盾构隧道纵向抗震薄弱部位,软土侧结构内力显著增大的区域达到隧道外径的4倍;当地震波横向激振时,纵向弯矩起控制作用,而纵向输入时,则是较高的轴力对结构起控制作用;相同水平地震作用下,地震波纵向激振对结构的受力影响与横向相比更加不利。
[Abstract]:Compared with the transverse stiffness, the longitudinal stiffness of shield tunnel is smaller than that of the transverse one, and it is easy to cause earthquake damage due to excessive deformation under earthquake, especially in the position where the ground or structure itself has a sudden change. The longitudinal seismic problem is more worthy of attention. In this paper, the longitudinal dynamic response of the tunnel under different earthquake action is calculated by using the stratum structure model and the longitudinal equivalent stiffness model, and the longitudinal rotation angle is obtained. The seismic indexes such as segment and joint bolt stress are checked and calculated. The results show that the soft and hard abrupt stratum is the weak position of longitudinal seismic resistance of shield tunnel. The area where the internal force of the soft soil side structure increases significantly is 4 times of the tunnel diameter. The longitudinal bending moment plays a controlling role when the seismic wave is transversely excited, and when the longitudinal input, the higher axial force plays a controlling role on the structure. Under the action of the same horizontal earthquake, the effect of longitudinal excitation of seismic wave on the structure is more disadvantageous than that on the transverse.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家重点研发计划(2016YFC0802201,2016YFC0802202) 中国工程院重点咨询项目(2015-XZ-28-02) 国家自然科学基金项目(51378433,51578457,51578462)
【分类号】：U455.43;U452.28
【正文快照】： 1引言题,对地震作用下接头刚度以及地基参数对隧道的内力及变形的影响情况进行了分析研究[3];蒋建群虽然盾构隧道因其特殊的“管片+接头”结构形等以等价刚度非线性动力有限元法,就隧道等价刚式相比传统矿山法隧道具有更强的适应地层变形的度、螺栓非线性及地基参数非线性等要

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