悬索桥隧道锚数值分析与工程应用研究

发布时间：2018-04-24 20:35

本文选题：悬索桥 + 隧道式锚碇　；参考：《大连理工大学》2015年硕士论文

【摘要】：锚固系统是悬索桥的重要组成部分,地锚式悬索桥的锚固系统一般可以分为重力式锚碇,土锚锚碇以及隧道式锚碇。在山区等特殊地形建造悬索桥时,隧道式锚碇因其工程量少、造价低,与周围环境相适宜等优点,相比其他锚固方案具有巨大优势。但是,目前国内外采用隧道式锚碇的工程实例较少,对锚碇的受力与破坏机理研究尚不够清楚,因此对于隧道式锚碇的研究很有必要。本文以丹东战备桥为工程背景,对隧道锚的受力变形规律进行研究,并希望为类似工程的设计方法提供一定的参考。本文的主要内容可分为以下几个部分：(1)在前人研究的基础上,总结了隧道式锚碇在现有工程实例中的构造形式,锚固系统的可能破坏模式以及锚固系统稳定性计算方法。(2)研究了隧道锚数值计算中的一些要点问题,包括初始应力场的模拟方法,岩土材料不同屈服条件的比较,软弱夹层的模拟方式与接触分析的要点,以及锚碇施工过程数值模拟的实现方法。(3)利用通用有限元软件Ansys,建立锚碇-围岩系统的粘结计算模型与摩擦计算模型。研究随着主缆力的变化,锚固系统的变形规律与破坏过程。通过研究粘结模型与摩擦模型的受力区别,比较两种模型关键计算结果的误差,得到粘结模型的适用范围。(4)以丹东某战备桥为工程实例,提出了该桥隧道式锚碇的构造设计方案,利用岩土工程专用有限元软件Midas,建立锚碇-围岩系统的三维弹塑性数值计算模型,并对锚固系统进行了施工阶段分析与运营阶段分析,得到了锚固体系在施工与运营阶段的受力与变形特征。验证了隧道锚施工过程中围岩的稳定性,证明了在运营阶段段,锚固系统是足够安全的,具有7倍的超载稳定性。
[Abstract]:Anchorage system is an important part of suspension bridge. The Anchorage system of ground Anchorage suspension Bridge can be divided into gravity Anchorage, Earth Anchorage and Tunnel Anchorage. In the construction of suspension bridges in mountainous areas, tunnel Anchorage has great advantages over other anchoring schemes because of its advantages of less engineering quantity, lower cost and suitable to the surrounding environment. However, there are few examples of tunnel Anchorage at home and abroad, so it is necessary to study the mechanics and failure mechanism of tunnel Anchorage. Taking Dandong War Readiness Bridge as the engineering background, this paper studies the law of stress and deformation of tunnel anchor, and hopes to provide some reference for the design method of similar engineering. The main contents of this paper can be divided into the following parts: 1) on the basis of previous studies, the paper summarizes the structural forms of tunnel Anchorage in existing engineering examples. The possible failure mode of the anchoring system and the stability calculation method of the anchoring system are studied. Some key problems in the numerical calculation of the tunnel anchor are studied, including the simulation method of the initial stress field and the comparison of different yield conditions of the rock and soil materials. The simulation method of weak intercalation and the main points of contact analysis, as well as the realization method of numerical simulation of Anchorage construction process. 3) the bond calculation model and friction calculation model of Anchorage-surrounding rock system are established by using the general finite element software Ansys. The deformation law and failure process of the anchoring system are studied with the change of the main cable force. By studying the force difference between the bond model and the friction model, the errors of the key calculation results of the two models are compared, and the applicable range of the bond model is obtained. The structural design scheme of the tunnel Anchorage of the bridge is put forward. The three-dimensional elastic-plastic numerical model of the Anchorage surrounding rock system is established by using the special finite element software Midas. the anchoring system is analyzed in the construction stage and the operation stage. The stress and deformation characteristics of Anchorage system in construction and operation are obtained. The stability of surrounding rock during tunnel anchor construction is verified. It is proved that the anchoring system is safe enough and has 7 times overloading stability in the operation stage.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.25

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