交叉盾构隧道列车振动响应及其累积损伤研究

发布时间：2018-05-09 08:41

本文选题：交叉盾构隧道 + 联络横通道　；参考：《西南交通大学》2017年硕士论文

【摘要】：针对交叉盾构隧道在长期运营过程中容易出现振动损伤问题,依托国家自然科学基金项目(51278425),采用理论分析和数值模拟方法,开展了交叉隧道结构振动响应及疲劳累积损伤研究。根据改进的混凝土疲劳本构模型,考虑列车行驶效应,分析含联络横通道结构交叉盾构隧道和近距离空间交叉盾构隧道的疲劳寿命,以及两种交叉隧道结构在不同运营年限的动力响应和累积损伤。主要工作和成果如下:(1)根据现行混凝土设计规范中混凝土单轴本构模型,考虑疲劳损伤导致的混凝土刚度退化、强度下降和疲劳残余应变增加等因素,改进并提出了混凝土疲劳本构模型,该模型适合开展高周列车振动疲劳分析;(2)分别建立了结构交叉和空间交叉盾构隧道两种交叉隧道模型,考虑列车行驶效应,模拟了列车在隧道中行驶的全过程。基于列车首次行驶引起的结构动力响应,采用名义应力法,获得了两种交叉盾构隧道的疲劳寿命;(3)基于改进的混凝土疲劳本构模型,分析了不同运营年限结构交叉和空间交叉盾构隧道的应力、加速度等动力响应特性。结果表明:观测点振动具有明显的阶段性;列车所在主隧道中部位置振动最为剧烈,邻近主隧道振动相对平缓;随着列车运营年限的增加,隧道结构的应力和加速度均有一定程度的增加;(4)采用混凝土塑性损伤模型,分析了在运营不同年限后结构交叉和空间交叉盾构隧道的压致累积损伤和拉致累积损伤特性。结果表明:对于交叉盾构隧道,主隧道累积损伤随运营时间呈两阶段发展特性,而联络横通道累积损伤随运营时间呈三阶段发展特性;主隧道累积损伤主要集中在隧道仰拱位置,而联络横通道累积损伤主要集中在其两侧边墙墙角位置;隧道结构拉致累积损伤大小和范围均大于压致累积损伤,拉致损伤是结构损伤破坏的控制性因素。
[Abstract]:In view of the problem of vibration damage in the long run of cross shield tunnel, the vibration response and fatigue cumulative damage of cross shield tunnel structure are studied by theoretical analysis and numerical simulation method, relying on the project of National Natural Science Foundation of China (NSFC) of 51278425. Based on the improved concrete fatigue constitutive model, the fatigue life of cross shield tunnel and close space cross shield tunnel are analyzed by considering the train running effect. As well as the dynamic response and cumulative damage of two kinds of cross-tunnel structures under different operating life. The main work and results are as follows: (1) according to the uniaxial constitutive model of concrete in the current concrete design code, the factors such as the degradation of concrete stiffness caused by fatigue damage, the decrease of strength and the increase of fatigue residual strain are considered. The concrete fatigue constitutive model is improved and put forward. The model is suitable for the vibration fatigue analysis of high cycle trains. Two kinds of cross tunnel models, namely structural crossing tunnel and space crossing shield tunnel, are established to consider the train running effect. The whole process of train running in tunnel is simulated. Based on the structural dynamic response caused by the first running of a train and the nominal stress method, the fatigue life of two kinds of cross shield tunnel is obtained. The dynamic response characteristics such as stress and acceleration of shield tunnel with different operating years are analyzed. The results show that the vibration of the observation point has obvious stages, the vibration of the middle part of the main tunnel is the most intense, the vibration of the adjacent main tunnel is relatively gentle, and with the increase of the train operating life, The stress and acceleration of tunnel structure are increased to a certain extent. The concrete plastic damage model is used to analyze the cumulative damage caused by compression and tension in tunnel with cross and space crossing shield after different years of operation. The results show that the cumulative damage of the main tunnel develops in two stages with the operation time, while the cumulative damage of the connecting transverse tunnel develops in three stages with the operation time. The cumulative damage of the main tunnel is mainly concentrated in the position of the tunnel inverted arch, while the cumulative damage of the connecting transverse passage is mainly located at the corner of the sidewall on both sides of the tunnel, and the cumulative damage caused by the tensile damage of the tunnel structure is larger than that caused by the cumulative damage caused by compression. Tensile damage is the controlling factor of structural damage.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43

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