湖南科技大学核心区月湖景观桥桥坝合一基础沉降及坝体受力研究

发布时间：2018-03-30 11:48

本文选题：桥坝合一　切入点：基础沉降　出处：《湖南科技大学》2014年硕士论文

【摘要】：湖南科技大学核心区月湖景观桥采用了拱桥与坝体合一的结构形式。坝体和桥梁建为一体，既能造就美丽的校园景观，又能节省坝体的造价，还能为拱桥提供强大的系杆以克服拱桥对地基基础抗推能力要求高的缺点。但是桥坝合一结构会增加桥台、坝体及基础受力的复杂性。虽然桥台与坝体建成了一体，但桥台与坝体的地基为两个不同的持力层，而且坝体与桥台在自重大小和要承受的荷载性质和大小差别较大。因此两者的地基持力层产生的应力会有所不同，地基在沉降变形上也可能会不一致，计算结构的地基受力与基础沉降依靠传统的手算方法很难实现。坝体作为水工结构要提供挡水蓄水的功能，本结构的坝体为混凝土重力式坝，，坝体要实现预定的功能坝体的强度要满足要求。针对上述问题展开了以下工作： (1)桥梁上部结构承受的全部荷载是通过桥台传递给地基的，桥台的设计关系到整座桥梁的安全，本文结合景观与地基承载能力要求设计了桥台结构形式并通过计算桥台地基应力对桥台设计进行了验算，结果表明桥台设计合理； (2)本文通过建立FLAC三维空间仿真模型对地基基础沉降进行了计算以及对地基应力分布情况进行了分析，分析结果表明结构基础的总体沉降较大，但基础的不均匀沉降较小，地基应力未超过其容许承载能力； (3)结构基础为混凝土扩大基础，由于地基基础沉降使得结构基础受力变得比较复杂，在结构的施工和运营过程中结构基础底部是否会受拉破坏关系到整个结构的安全，通过FLAC软件建立的模型计算分析了基础底部拉应力的情况，计算结果表明结构基础安全； (4)通过利用FLAC软件建立的空间模型分析了坝体在各个施工过程及运营过程中的应力分布情况，由此判断坝体强度是否满足要求以及为坝体配筋提供依据。
[Abstract]:The moon lake landscape bridge in the core area of Hunan University of Science and Technology adopts the structural form of unity of the arch bridge and the dam body . The dam body and the bridge are built into a whole , which not only can make the beautiful campus landscape , but also can save the construction cost of the dam body .

( 1 ) All the loads borne by the upper structure of the bridge are transmitted to the foundation through the abutment , the design of the abutment is related to the safety of the whole bridge , the structure form of the abutment is designed according to the requirements of landscape and foundation bearing capacity , and the design of the abutment is calculated by calculating the stress of the abutment foundation . The results show that the design of the abutment is reasonable ;

( 2 ) By establishing the FLAC three - dimensional space simulation model , the foundation settlement of the foundation is calculated and the stress distribution of the foundation is analyzed . The results show that the overall settlement of the structural foundation is large , but the uneven settlement of the foundation is smaller , and the foundation stress does not exceed its allowable bearing capacity ;

( 3 ) The foundation of the structure is the foundation of the concrete expansion , because the foundation settlement of the foundation becomes more complicated , whether the bottom of the structure is damaged or not is connected to the safety of the whole structure during the construction and operation of the structure , and the foundation bottom tensile stress is analyzed through the model calculation established by the FLAC software , and the calculation results show that the structural foundation is safe ;

( 4 ) By using the space model established by FLAC software , the stress distribution of the dam body in each construction process and operation process is analyzed , and it is determined whether the strength of the dam body meets the requirements and provides the basis for the reinforcement of the dam body .

【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442;TV31

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