【作者】 杨昌贤；

【导师】 王志杰；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 目前国内隧道多采用新奥法设计与施工,与其对应的复合式衬砌是由初期支护、防水层和二次衬砌所组成,且严格要求二次衬砌必须在围岩和初期支护变形基本稳定后才开始施工。对于初期支护的设计,业界现在已达成比较一致的看法,换句话说,在相同的开挖断面、相似的地质条件下初期支护设计都是大同小异的。但对于二次衬砌的厚度、是否需要配筋的看法则有很大的不同。而二次衬砌直接关系到开挖断面的大小和工程造价。本文通过现场试验并结合数值模拟研究的方法,对围岩压力和接触压力的分布规律以及二次衬砌安全性评价和优化设计作了初探。主要结论及成果如下：1、基于现场实测应力数据,对Ⅲ级、Ⅳ级、Ⅴ级深埋段和Ⅴ级浅埋段围岩压力和接触压力分别进行统计分析,得到围岩压力和接触压力的分布规律以及二次衬砌分担围岩压力比例；2、通过对比Ⅲ级、Ⅳ级、Ⅴ级深埋段现场实测围岩压力与经典围岩理论计算结果,得到对应围岩级别围岩压力分别适合采用普氏理论、太沙基理论以及隧规理论计算比较符合实测情况。3、通过有限元数值模拟方法,研究了不同侧压力系数和衬砌厚度对隧道变形和内力的影响,对二次衬砌安全性进行了评价并得出了二次衬砌的最小安全厚度；4、以工程造价为目标函数,采用内部罚函数法建立数学模型,以结构强度和配筋率为约束条件,对二次衬砌的厚度和配筋进行优化分析。更多还原

【Abstract】 Currently, many tunnels are designed and constructed by the New Austrian Tunneling Method. Composite lining is corresponding with this method and make up of primary support, waterproof layer and secondary lining. And the secondary lining is required strictly to construct after the deformation of surrounding rock and primary support was basic stability. To the design of primary support, the civil engineering industry has reached an identical attitude now. In other words, we have the almost same design of primary support on the same excavation of the section or the same geological conditions. However, the thickness or the need for reinforcement of view to the secondary lining is very different. But it is directly related to the excavation of the size and project cost. By means of numerical simulation and in-situ test, this article research on distribution rule of surrounding rock pressure and contact pressure and safety evaluation and design optimization of secondary linings. The main conclusions and results are as follows:1、Based on stress tested in-situ, analyzed on surrounding rock pressure and contact pressure ofⅤ-class surrounding rock,Ⅳ-class surrounding rock,Ⅲ-class surrounding rock in deep-buried andⅤ-class surrounding rock in shallow with statistics method to have the distribution of the general laws and the shared ratio of surrounding rock pressure of secondary lining;2、Compared surrounding rock pressure tested in-situ with classical theory results ofⅤ-class surrounding rock, IV-class surrounding rock andⅢ-class surrounding rock in deep-buried, the result from the Pu’s theory, Terzaghi theory, deep-buried surrounding rock pressure formula of highway tunnel design specification is closest to the measure value respectively;3、With the method of the finite element numerical simulations, research on different side-pressure coefficients and thickness of secondary lining to the influence of the deformation and internal force of tunnel, evaluate the security and find the optimization thickness of it;4、Take the project cost as objective function, use the internal penalty function method to establish mathematical models with strength of structure conditions and reinforcement rate as constraints, optimize analysis on the secondary lining thickness and reinforcement.更多还原