立交隧道地层敏感度及结构适应性研究
发布时间：2018-08-20 10:00
【摘要】：随着大量地下工程的兴建,立交隧道工程也大量涌现,其中下穿工程对既有隧道的安全形成了严峻的考验,成为城市隧道建设中等级最高的风险工程。现有的研究主要是针对具体工程项目进行研究,针对立交隧道的系统性研究非常缺乏,因此,针对主要环境敏感点建设立交隧道时“地层敏感性”及结构适应性问题进行系统研究就非常有必要,对完善与促进地下道路建设技术的发展具有重大意义。本文以重庆市科技人才培养计划(领军人才)项目“城市地下道路地层敏感度及结构适应性研究”为依托,利用数学系统分析理论中的敏感度分析方法结合弹塑性力学理论、有限元理论推导得出了立交隧道单因素敏感度公式,结合有限元数值模拟计算、数据调研手段,对不同埋深、不同围岩条件、不同层厚工况下的立交隧道工程进行了系统性的力学研究并得出了相应的工程敏感度及适应性措施。本文的主要研究内容如下:①针对国内十一省市上百座隧道进行了详细调查研究。②利用数学系统分析理论中的敏感度分析方法结合弹塑性力学理论、有限元理论推导得出了立交隧道单因素敏感度公式。③根据调研结果,建立了不同埋深、不同围岩条件、不同层厚条件下的立交隧道三维有限元模型共计120组,对立交隧道新建隧道下穿既有隧道进行了力学及敏感度研究。④以有限元模型计算结果为基础,并参考日本铁路隧道近接施工指南以及《铁路隧道施工规范》(TB10304-2009),从结构物稳定出发,以新建隧道对既有隧道的影响应力增加的容许值为基准,系统得出了立交隧道不同埋深、不同围岩条件下新建隧道与既有隧道的合理层厚,为以后立交隧道新建隧道下穿既有隧道的设计以及施工提供参考;将前文计算所得的敏感度划分为强敏感区、弱敏感区、非敏感区,避免在以后立交隧道设计过程中,使新建隧道对既有隧道的影响处在强敏感区。⑤在前文所得敏感区敏感度阈值的基础之上,根据调研结果制定相应的结构适应性计算模型,得出了相应适应性模型的敏感度。⑥根据适应性方案实际降低敏感度的效果,将适应性方案按照强敏感区、弱敏感区分类,为立交隧道新建隧道下穿既有隧道处于特殊敏感区内的工况适应性方案的选择提供参考,避免主观错误判断。
[Abstract]:With the construction of a large number of underground projects, the overpass tunnel project has emerged in large numbers, among which the underpass project has formed a severe test to the safety of the existing tunnel, and has become the highest grade risk engineering in the construction of urban tunnel. The existing research is mainly aimed at specific engineering projects, and the systematic research on the interchange tunnel is very lacking, so, It is necessary to systematically study the problems of "stratum sensitivity" and structural adaptability in the construction of interchange tunnels at major environmental sensitive points, which is of great significance to improve and promote the development of underground road construction technology. In this paper, based on Chongqing Science and Technology Talent training Program (leading talent) project, "study on the sensitivity and structural adaptability of Urban Underground Road", the sensitivity analysis method of mathematical system analysis theory is combined with elastic-plastic mechanics theory. The formula of single factor sensitivity of the interchange tunnel is derived from the finite element theory. Combined with the finite element numerical simulation calculation and the data investigation method, different buried depth and different surrounding rock conditions are obtained. A systematic mechanical study was carried out on the interchange tunnel under different layer thickness conditions, and the corresponding engineering sensitivity and adaptive measures were obtained. The main contents of this paper are as follows: 1. A detailed investigation was carried out on more than 100 tunnels in 11 provinces and cities in China .2 using sensitivity analysis method in mathematical system analysis theory combined with elastoplastic mechanics theory. Based on the results of investigation, a three-dimensional finite element model of an interchange tunnel with different burial depth, different surrounding rock condition and different layer thickness was established, and a total of 120 groups of 3D finite element models were established. Based on the results of finite element model, the mechanics and sensitivity of the existing tunnel under the new tunnel are studied. With reference to the Japanese Railway Tunnel Construction Guide and the Railway Tunnel Construction Code (TB10304-2009), based on the stability of the structure and the allowable value of the stress increase of the new tunnel on the existing tunnel, the different buried depths of the interchange tunnel are obtained systematically. The reasonable layer thickness of the new tunnel and the existing tunnel under different surrounding rock conditions provides a reference for the design and construction of the new tunnel under the existing tunnel in the future interchange tunnel, the sensitivity calculated above is divided into strong sensitive area and weak sensitive zone, In order to avoid the influence of the new tunnel on the existing tunnel in the design process of the overpass tunnel in the future, the insensitive zone should be located on the basis of the sensitivity threshold of the sensitive zone obtained in the previous paper. According to the investigation results, the corresponding structural adaptability calculation model is established, and the sensitivity of the corresponding adaptive model is obtained. The sensitivity of the corresponding adaptive model is reduced according to the actual adaptability scheme, and the adaptive scheme is classified according to the strong sensitive region and the weak sensitive area. This paper provides a reference for the selection of adaptive scheme of operating condition in the special sensitive zone of the existing tunnel under the new tunnel, and avoids the subjective misjudgment.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451
本文编号：2193218
[Abstract]:With the construction of a large number of underground projects, the overpass tunnel project has emerged in large numbers, among which the underpass project has formed a severe test to the safety of the existing tunnel, and has become the highest grade risk engineering in the construction of urban tunnel. The existing research is mainly aimed at specific engineering projects, and the systematic research on the interchange tunnel is very lacking, so, It is necessary to systematically study the problems of "stratum sensitivity" and structural adaptability in the construction of interchange tunnels at major environmental sensitive points, which is of great significance to improve and promote the development of underground road construction technology. In this paper, based on Chongqing Science and Technology Talent training Program (leading talent) project, "study on the sensitivity and structural adaptability of Urban Underground Road", the sensitivity analysis method of mathematical system analysis theory is combined with elastic-plastic mechanics theory. The formula of single factor sensitivity of the interchange tunnel is derived from the finite element theory. Combined with the finite element numerical simulation calculation and the data investigation method, different buried depth and different surrounding rock conditions are obtained. A systematic mechanical study was carried out on the interchange tunnel under different layer thickness conditions, and the corresponding engineering sensitivity and adaptive measures were obtained. The main contents of this paper are as follows: 1. A detailed investigation was carried out on more than 100 tunnels in 11 provinces and cities in China .2 using sensitivity analysis method in mathematical system analysis theory combined with elastoplastic mechanics theory. Based on the results of investigation, a three-dimensional finite element model of an interchange tunnel with different burial depth, different surrounding rock condition and different layer thickness was established, and a total of 120 groups of 3D finite element models were established. Based on the results of finite element model, the mechanics and sensitivity of the existing tunnel under the new tunnel are studied. With reference to the Japanese Railway Tunnel Construction Guide and the Railway Tunnel Construction Code (TB10304-2009), based on the stability of the structure and the allowable value of the stress increase of the new tunnel on the existing tunnel, the different buried depths of the interchange tunnel are obtained systematically. The reasonable layer thickness of the new tunnel and the existing tunnel under different surrounding rock conditions provides a reference for the design and construction of the new tunnel under the existing tunnel in the future interchange tunnel, the sensitivity calculated above is divided into strong sensitive area and weak sensitive zone, In order to avoid the influence of the new tunnel on the existing tunnel in the design process of the overpass tunnel in the future, the insensitive zone should be located on the basis of the sensitivity threshold of the sensitive zone obtained in the previous paper. According to the investigation results, the corresponding structural adaptability calculation model is established, and the sensitivity of the corresponding adaptive model is obtained. The sensitivity of the corresponding adaptive model is reduced according to the actual adaptability scheme, and the adaptive scheme is classified according to the strong sensitive region and the weak sensitive area. This paper provides a reference for the selection of adaptive scheme of operating condition in the special sensitive zone of the existing tunnel under the new tunnel, and avoids the subjective misjudgment.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451
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