深基坑开挖对即有桥桩的影响及加固技术研究
发布时间：2018-11-11 19:13
【摘要】：有限的地面空间日渐无法满足人类交通建设工程和城市建筑事业不断发展壮大的需求，人们开始寻求向地下和高空的发展空间。当邻近有基坑开挖时的建筑、道路桥梁等的桩基础将不同程度地会受到土层变动的影响而产生不良响应，，由此而引发的工程事故越来越多、越来越得到工程界的重视。本文着眼于桥梁桩基受邻近基坑开挖的影响在前人已做的研究基础上对其展开系统而深入的研究具有重要的理论和现实意义，主要研究工作如下： （1）系统总结和论述了当前国内外的各种有关桩土相互作用体系的理论分析和计算方法、试验测试手段等，特别是既有桥梁桩基受邻近基坑开挖影响的研究现状。 （2）简略介绍了有限差分法和有线差分软件FLAC3D及其主要特点、计算原理，并将其与有限元软件进行对比，总结了二者在各类问题上的优缺点和适用性，为今后面临同类问题选择计算软件时提供了一定的参考依据。 （3）以某基坑工程为背景，基于FLAC3D研究平台系统地分析研究了邻近该基坑的既有桥梁桩基对基坑开挖的各种性状的响应，利用工程实际进行校核后对数值模拟结果进行输出整理，得出了若干既与工程实际相符又有一定的理论及实践意义的初步结论。 （4）针对背景项目中的桥梁桩基已出现的过大的超过相关规范允许标准、可能影响桥梁安全性能的病害提出了两种开挖工作实施前对桥桩的预加固和围护方案，并通过调整先前已经建立好的、经对比验证符合工程实际的标准化模型，再次利用FLAC3D进行仿真模拟，根据计算分析结果论证各方案的可行性，对今后同类工程的勘察设计、施工监测等工作可以提供一定的参考和指导。
[Abstract]:The limited ground space can not meet the needs of human traffic construction engineering and urban construction. People begin to seek the underground and high-altitude development space. When the pile foundation is adjacent to the excavation of foundation pit, the pile foundation will be affected by the change of soil layer to some extent, resulting in more and more engineering accidents, which has been paid more and more attention by the engineering circles. In this paper, it is of great theoretical and practical significance to carry out systematic and in-depth research on bridge pile foundation influenced by excavation of adjacent foundation pit on the basis of previous researches. The main research works are as follows: (1) the theoretical analysis and calculation methods of various pile-soil interaction systems at home and abroad, the testing and testing methods, etc., are systematically summarized and discussed. Especially, the existing bridge pile foundation is affected by the excavation of adjacent foundation pit. (2) introduce the finite difference method and the cable difference software FLAC3D and their main characteristics, calculation principle, compare them with the finite element software, summarize their advantages and disadvantages and their applicability in all kinds of problems. It provides a certain reference basis for selecting calculation software in the face of similar problems in the future. (3) based on the FLAC3D research platform, the response of the existing bridge pile foundation adjacent to the foundation pit to various characteristics of the excavation is analyzed systematically based on a foundation pit project. After checking the engineering practice, the output of the numerical simulation results is sorted out, and some preliminary conclusions are obtained, which are not only consistent with the engineering practice, but also of certain theoretical and practical significance. (4) two kinds of pre-strengthening and retaining schemes for bridge piles before excavation are put forward in view of the diseases which have already appeared in the background projects which exceed the allowable standards of relevant codes and may affect the safety performance of bridges. And by adjusting the standardized model that has been established before and verified by contrast to the actual project, and then using FLAC3D to carry out simulation again, according to the results of calculation and analysis, the feasibility of each scheme is proved, and the reconnaissance and design of similar projects in the future are discussed. Construction monitoring and other work can provide a certain reference and guidance.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.15;TU753
本文编号：2325848
[Abstract]:The limited ground space can not meet the needs of human traffic construction engineering and urban construction. People begin to seek the underground and high-altitude development space. When the pile foundation is adjacent to the excavation of foundation pit, the pile foundation will be affected by the change of soil layer to some extent, resulting in more and more engineering accidents, which has been paid more and more attention by the engineering circles. In this paper, it is of great theoretical and practical significance to carry out systematic and in-depth research on bridge pile foundation influenced by excavation of adjacent foundation pit on the basis of previous researches. The main research works are as follows: (1) the theoretical analysis and calculation methods of various pile-soil interaction systems at home and abroad, the testing and testing methods, etc., are systematically summarized and discussed. Especially, the existing bridge pile foundation is affected by the excavation of adjacent foundation pit. (2) introduce the finite difference method and the cable difference software FLAC3D and their main characteristics, calculation principle, compare them with the finite element software, summarize their advantages and disadvantages and their applicability in all kinds of problems. It provides a certain reference basis for selecting calculation software in the face of similar problems in the future. (3) based on the FLAC3D research platform, the response of the existing bridge pile foundation adjacent to the foundation pit to various characteristics of the excavation is analyzed systematically based on a foundation pit project. After checking the engineering practice, the output of the numerical simulation results is sorted out, and some preliminary conclusions are obtained, which are not only consistent with the engineering practice, but also of certain theoretical and practical significance. (4) two kinds of pre-strengthening and retaining schemes for bridge piles before excavation are put forward in view of the diseases which have already appeared in the background projects which exceed the allowable standards of relevant codes and may affect the safety performance of bridges. And by adjusting the standardized model that has been established before and verified by contrast to the actual project, and then using FLAC3D to carry out simulation again, according to the results of calculation and analysis, the feasibility of each scheme is proved, and the reconnaissance and design of similar projects in the future are discussed. Construction monitoring and other work can provide a certain reference and guidance.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.15;TU753
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