公路桥梁桩基工程溶洞处理研究

发布时间：2019-07-04 12:39

【摘要】：近年以来，伴随着公路、桥梁等大型交通项目的规模性建设，大量桩基础的应用和工程机械设备性能的提升，项目过程中桩基础的机械化程度明显提高，因此，增强了对工程地质条件的适宜性。钻孔桩具有施工简单、安全、成孔速度快等优点，因此在桥梁基础设计和施工中得到了广泛的应用。但是，由于各种复杂地质条件的存在，钻孔灌注桩的施工工艺受到了限制，因此对于钻孔桩施工工艺的探讨和研究具有很大的现实意义。溶洞发育机理和溶洞作用多种多样，溶洞地区工程地质条件十分复杂，，给公路工程的设计、施工和运营带来很多不利因素。本文以邢汾高速公路滹沱3号大桥桩基为背景，进行溶洞和溶洞工程地质勘察研究，开展溶洞地区溶洞洞穴稳定性和桩基特性研究，加强溶洞地区桥梁桩基设计和施工方面的研究，为同类工程提供可靠的理论基础和技术支持，对溶洞地区新建公路桥梁桩基设计与施工都有重要的指导意义。首先，研究了溶洞学基本原理，包括溶洞发育的基本条件，溶洞形态及类型，溶洞洞穴的成因与分类；论述了溶洞对工程的危害及其处理方法，包括溶洞水对工程的危害，岩溶洞穴对工程的危害，溶洞危害的工程处理。其次，对邢汾高速公路滹沱3号大桥桩基岩溶地区工程地质勘察、地质雷达勘测及现场开挖揭露情况进行了深入研究，提出了具体针对滹沱3号大桥工程的桩基溶洞处理方案，对设计变更后桩基承载力进行了验算分析，并对处理效果进行了初步分析。
文内图片：

图片说明：-2#桩孔竖向裂隙（现场照片，俯视）
[Abstract]:In recent years, with the large-scale construction of highway, bridge and other large traffic projects, the application of a large number of pile foundations and the improvement of the performance of construction machinery and equipment, the mechanization degree of pile foundation in the process of the project has been obviously improved, therefore, the suitability to engineering geological conditions has been enhanced. Bored pile has many advantages, such as simple construction, safety and fast drilling speed, so it has been widely used in bridge foundation design and construction. However, due to the existence of various complex geological conditions, the construction technology of bored pile is limited, so it is of great practical significance to discuss and study the construction technology of bored pile. The development mechanism and cave function of caverns are various, and the engineering geological conditions in caverns area are very complex, which brings many unfavorable factors to the design, construction and operation of highway engineering. Based on the pile foundation of Hutuo No. 3 Bridge on Xingfen Expressway, this paper studies the engineering geological investigation of caverns and caverns, studies the stability and pile foundation characteristics of caverns in caverns, strengthens the research on pile foundation design and construction of bridges in caverns, and provides reliable theoretical basis and technical support for similar projects, which is of great guiding significance for the design and construction of pile foundations of newly built highway bridges in caverns. Firstly, the basic principles of cave science are studied, including the basic conditions of cave development, the shape and type of cave, the origin and classification of cave, and the harm of cave to engineering and its treatment methods, including the harm of cave water to engineering, the harm of Karst cave to engineering and the engineering treatment of cave hazard. Secondly, the engineering geological survey, geological radar survey and site excavation disclosure of pile foundation Karst area of Hutuo No. 3 Bridge on Xingfen Expressway are deeply studied, and the treatment scheme of pile foundation caverns for Hutuo No. 3 Bridge is put forward, and the bearing capacity of pile foundation after design change is checked and analyzed, and the treatment effect is preliminarily analyzed.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.551

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