不同衬砌结构缺陷对隧道结构整体安全性的影响

发布时间：2019-01-07 13:17

【摘要】：为研究不同衬砌缺陷对隧道结构整体安全性的影响,以某实体隧道工程为依托,采用荷载-结构法建立有限元数值模型,分别对衬砌在正常状态、强度不足、厚度不足及背后脱空4种工况下进行数值计算,对比分析了不同衬砌缺陷对结构安全性的影响。结果表明:当隧道衬砌存在强度不足和厚度不足缺陷时,缺陷部位单元的安全系数减小,而其他部位的安全系数基本不变,随着衬砌厚度不足程度的加深,相应缺陷位置的安全系数也随之降低;当衬砌背后脱空面积较大时,衬砌脱空部位与其相邻位置处的剪力和弯矩均发生正负突变,衬砌结构受力与变形模式发生改变,脱空区域安全系数明显减小,但脱空部位相邻区域衬砌结构的安全系数反而增大,其他部位安全系数没有明显变化,与正常状态下基本保持一致。
[Abstract]:In order to study the influence of different lining defects on the overall safety of tunnel structure, a finite element numerical model is established by using load-structure method based on an entity tunnel project. The influence of different lining defects on the safety of the structure is compared and analyzed by numerical calculation under four working conditions: the thickness deficiency and the backside void removal. The results show that when the tunnel lining has defects in strength and thickness, the safety factor of the defective parts decreases, while the safety factor of the other parts is basically unchanged, and with the deepening of the thickness of the lining, The safety factor of the corresponding defect position is also reduced; When the empty area behind the lining is large, the shear force and bending moment of the empty part of the lining and adjacent position of the lining have both positive and negative mutations, the stress and deformation mode of the lining structure have changed, and the safety factor of the empty area is obviously reduced. However, the safety factor of the lining structure in the adjacent areas of the voids increases, while the safety factor of the other parts does not change obviously, which is basically consistent with the normal state.
【作者单位】：温州市交通投资集团有限公司;长安大学陕西省公路桥梁与隧道重点实验室;青海大学土木工程学院;中交第一公路勘察设计院有限公司;
【基金】：国家自然科学基金项目(51408554) 浙江交通科技建设项目(2016025)
【分类号】：U451

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