桩—柱式桥基变形可靠性分析及其工程应用研究
发布时间：2018-12-31 21:33
【摘要】：随着我国西部大开发战略的进一步推进，山区高速公路与铁路发展迅速，当其穿越山岭地带时，为保护现有的生态人文环境，应避免对山体大切大挖，为此，在某些路段不得不采用高架桥穿越山坡或峡谷。于是，桩-柱式桥梁基础成为广泛采用的基础形式。由于桩-柱式桥梁桩基所遇到的工程水文地质条件、岩土参数、受荷性质及大小等影响因素往往具有不确定性，所以，开展山区桩-柱式桥梁桩基可靠性分析研究具有重要的理论和实际意义。目前有关桩基承载力可靠性分析的研究成果较多，但针对桩基变形（沉降与水平位移）可靠性分析研究成果很少。为此，本文以龙永高速公路K82+965段大坝2号大桥桩-柱式桥梁桩基为依托工程，通过构建基桩的沉降和水平变形可靠性分析计算模型，对大坝2号大桥左幅中的1~6#墩桥梁基桩沉降和水平变形可靠性进行较深入分析研究。 首先，综合分析了现有桥梁基桩沉降、水平受力与变形计算以及基桩可靠度计算的研究现状；其次，基于剪切位移法，建立了山区桩-柱式桥梁基桩沉降计算模型，得到了相应的基桩沉降计算方法，并据此提出了基于改进Rosenblueth法桩-柱式桥梁基桩沉降可靠度指标计算方法；然后，分析了山区桩-柱式桥梁基桩的受力特点及破坏模式，通过建立桩-柱式桥梁基桩水平受力简化计算模型，导出了各特征桩段的挠曲微分方程，借助幂级数法，得到了水平荷载作用下山区桩-柱式桥梁基桩内力与变形计算半解析解答，，同时基于验算点法，提出了水平荷载作用下山区桩-柱式桥梁基桩水平变形可靠度指标计算方法；最后，利用本文提出的方法，对大坝2号大桥左幅中的1~6#墩中基桩的沉降及水平变形可靠度指标及失效概率进行了计算分析，探讨了参数变异性对基桩沉降及水平变形可靠度指标的影响。 此外，工程实例和算例计算结果不仅验证了本文方法可行，而且还为依托工程的设计、施工及运营管理提供了技术指导。
[Abstract]:With the further development of the strategy of developing the west of China, the highway and railway in mountainous area are developing rapidly. In order to protect the existing ecological and human environment, the mountain body should be avoided to be cut and dug. Viaducts have to be used to cross hillsides or canyons in some sections of the road. Therefore, pile-column bridge foundation has become a widely used foundation form. Because of the uncertainty of engineering hydrogeological conditions, geotechnical parameters, properties and magnitude of load on pile foundation of pile-column bridge, so, It is of great theoretical and practical significance to carry out the reliability analysis of pile-column bridge in mountainous area. At present, there are many research results on the reliability analysis of pile foundation bearing capacity, but few researches have been made on the reliability analysis of pile foundation deformation (settlement and horizontal displacement). Therefore, based on the pile-column pile foundation of Daba No. 2 Bridge of Longyong Expressway K82 965 section, the reliability analysis model of settlement and horizontal deformation of foundation pile is constructed in this paper. The reliability of foundation pile settlement and horizontal deformation of the 1 ~ (6) Pier bridge in the left frame of Daba No. 2 Bridge is analyzed and studied in depth. Firstly, the present research status of bridge foundation pile settlement, horizontal force and deformation calculation and reliability calculation of foundation pile are analyzed synthetically. Secondly, based on the shear displacement method, the calculation model of pile settlement of pile-column bridge in mountainous area is established, and the corresponding calculation method of pile settlement is obtained. Based on the improved Rosenblueth method, a method for calculating the reliability of pile settlement index of pile-column bridge foundation is put forward. Then, the stress characteristics and failure mode of pile-column bridge foundation pile in mountainous area are analyzed. By establishing a simplified calculation model of horizontal force on pile-column bridge foundation pile, the flexural differential equation of each characteristic pile section is derived, and the power series method is used. The semi-analytical solution for the calculation of internal force and deformation of pile-column bridge foundation pile in mountainous area under horizontal load is obtained. At the same time, based on the checking point method, a calculation method for reliability index of horizontal deformation of pile-column bridge foundation pile in mountainous area under horizontal load is put forward. Finally, using the method proposed in this paper, the reliability index of settlement and horizontal deformation and the failure probability of the pile in the left frame of No. 1 # pier of Daba No. 2 Bridge are calculated and analyzed. The influence of parameter variability on the reliability index of pile settlement and horizontal deformation is discussed. In addition, the engineering examples and calculation results not only verify the feasibility of this method, but also provide technical guidance for the design, construction and operation management of the supporting project.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.1
本文编号：2397141
[Abstract]:With the further development of the strategy of developing the west of China, the highway and railway in mountainous area are developing rapidly. In order to protect the existing ecological and human environment, the mountain body should be avoided to be cut and dug. Viaducts have to be used to cross hillsides or canyons in some sections of the road. Therefore, pile-column bridge foundation has become a widely used foundation form. Because of the uncertainty of engineering hydrogeological conditions, geotechnical parameters, properties and magnitude of load on pile foundation of pile-column bridge, so, It is of great theoretical and practical significance to carry out the reliability analysis of pile-column bridge in mountainous area. At present, there are many research results on the reliability analysis of pile foundation bearing capacity, but few researches have been made on the reliability analysis of pile foundation deformation (settlement and horizontal displacement). Therefore, based on the pile-column pile foundation of Daba No. 2 Bridge of Longyong Expressway K82 965 section, the reliability analysis model of settlement and horizontal deformation of foundation pile is constructed in this paper. The reliability of foundation pile settlement and horizontal deformation of the 1 ~ (6) Pier bridge in the left frame of Daba No. 2 Bridge is analyzed and studied in depth. Firstly, the present research status of bridge foundation pile settlement, horizontal force and deformation calculation and reliability calculation of foundation pile are analyzed synthetically. Secondly, based on the shear displacement method, the calculation model of pile settlement of pile-column bridge in mountainous area is established, and the corresponding calculation method of pile settlement is obtained. Based on the improved Rosenblueth method, a method for calculating the reliability of pile settlement index of pile-column bridge foundation is put forward. Then, the stress characteristics and failure mode of pile-column bridge foundation pile in mountainous area are analyzed. By establishing a simplified calculation model of horizontal force on pile-column bridge foundation pile, the flexural differential equation of each characteristic pile section is derived, and the power series method is used. The semi-analytical solution for the calculation of internal force and deformation of pile-column bridge foundation pile in mountainous area under horizontal load is obtained. At the same time, based on the checking point method, a calculation method for reliability index of horizontal deformation of pile-column bridge foundation pile in mountainous area under horizontal load is put forward. Finally, using the method proposed in this paper, the reliability index of settlement and horizontal deformation and the failure probability of the pile in the left frame of No. 1 # pier of Daba No. 2 Bridge are calculated and analyzed. The influence of parameter variability on the reliability index of pile settlement and horizontal deformation is discussed. In addition, the engineering examples and calculation results not only verify the feasibility of this method, but also provide technical guidance for the design, construction and operation management of the supporting project.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.1
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