树根桩在桥梁基础加固中的应用及数值分析
发布时间：2019-04-02 10:20
【摘要】：对地基与结构物之间的平衡关系,树根桩可以最大限度地保持,这是它不同于其它桩突出的优点。正是它这一优点,使得其被广泛应用于既有建筑物的地基加固、纠偏、边坡稳定加固及抗浮等工程,在不破坏地基土对结构物的支撑作用的同时也保证了维修及加固的效果。铁路一般都承担着较为繁重的运输任务,故作为铁路桥梁的地基加固与一般新建建筑物的前期加固有所不同,加固时无论采取何种方式,原地基的稳定性都不能被扰动。所以对于既有线桥梁基础的处理,常规的置换加固法、强夯法等都不适用。然而树根桩因其不同于其他加固方法的特点和施工工艺特别适用于既有重载铁路桥梁的基础加固。本文在前人的研究基础上对树根桩的国内外研究现状、分类、特点、适用范围及计算等进行了较为全面的总结。结合工程实例,利用ANSYS软件对树根桩加固桥梁基础进行模拟,通过加固前后有限元非线性分析及结果对比,验证树根桩具有良好的加固效果。并对桩长、桩径、摩擦系数等因素对单桩及群桩的应力及沉降变形的影响进行了分析讨论。对于桩土数值分析中存在的初始地应力问题,即土体考虑先期沉降与否对桩土接触分析的影响问题,本文利用设置生死单元和荷载步的方法进行解决;并通过在带承台单桩模型(分为滑移和不滑移模型)算例上的应用,验证了此方法具有可靠性,为类似工程提供参考与借鉴。
[Abstract]:The root pile can be kept to the maximum extent by the balance between the foundation and the structure, which is the advantage that it is different from the other piles. It is one of its advantages that it is widely used in the engineering of foundation reinforcement, rectification, slope stability and anti-floating of existing buildings, and the effect of maintenance and reinforcement is also ensured without damaging the supporting effect of the foundation soil on the structure. The railway generally bears the heavy transportation task, so the foundation reinforcement of the railway bridge is different from that of the general new building, and the stability of the original foundation can not be disturbed at the time of reinforcement. Therefore, the conventional replacement and reinforcement method, the dynamic compaction method and the like are not applicable to the treatment of the existing cable bridge foundation. However, the root pile is especially suitable for the foundation reinforcement of the existing heavy-duty railway bridge because of its different characteristics and construction technology. In this paper, the present situation, classification, characteristics, application range and calculation of the root pile at home and abroad are summarized in this paper. Combined with the engineering example, the bridge foundation of the root pile is simulated by the ANSYS software, and the reinforced effect of the root pile is verified by the finite element non-linear analysis before and after the reinforcement and the result comparison. The effects of pile length, pile diameter and coefficient of friction on the stress and settlement deformation of single pile and group pile are discussed. In this paper, the problem of the initial stress in the pile-soil numerical analysis, that is, the influence of the early settlement of the soil on the soil contact analysis, is solved by means of the method of setting the life-and-death unit and the load step. The reliability of this method is verified by the application of a single pile model with a bearing platform (divided into a slip and a non-slip model), and the reference and reference for similar projects are provided.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.15
本文编号：2452480
[Abstract]:The root pile can be kept to the maximum extent by the balance between the foundation and the structure, which is the advantage that it is different from the other piles. It is one of its advantages that it is widely used in the engineering of foundation reinforcement, rectification, slope stability and anti-floating of existing buildings, and the effect of maintenance and reinforcement is also ensured without damaging the supporting effect of the foundation soil on the structure. The railway generally bears the heavy transportation task, so the foundation reinforcement of the railway bridge is different from that of the general new building, and the stability of the original foundation can not be disturbed at the time of reinforcement. Therefore, the conventional replacement and reinforcement method, the dynamic compaction method and the like are not applicable to the treatment of the existing cable bridge foundation. However, the root pile is especially suitable for the foundation reinforcement of the existing heavy-duty railway bridge because of its different characteristics and construction technology. In this paper, the present situation, classification, characteristics, application range and calculation of the root pile at home and abroad are summarized in this paper. Combined with the engineering example, the bridge foundation of the root pile is simulated by the ANSYS software, and the reinforced effect of the root pile is verified by the finite element non-linear analysis before and after the reinforcement and the result comparison. The effects of pile length, pile diameter and coefficient of friction on the stress and settlement deformation of single pile and group pile are discussed. In this paper, the problem of the initial stress in the pile-soil numerical analysis, that is, the influence of the early settlement of the soil on the soil contact analysis, is solved by means of the method of setting the life-and-death unit and the load step. The reliability of this method is verified by the application of a single pile model with a bearing platform (divided into a slip and a non-slip model), and the reference and reference for similar projects are provided.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.15
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，本文编号：2452480
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