【摘要】：隨著我國(guó)西部大開(kāi)發(fā)戰(zhàn)略的進(jìn)一步推進(jìn)，山區(qū)高速公路與鐵路發(fā)展迅速，當(dāng)其穿越山嶺地帶時(shí)，為保護(hù)現(xiàn)有的生態(tài)人文環(huán)境，應(yīng)避免對(duì)山體大切大挖，為此，在某些路段不得不采用高架橋穿越山坡或峽谷。于是，樁-柱式橋梁基礎(chǔ)成為廣泛采用的基礎(chǔ)形式。由于樁-柱式橋梁樁基所遇到的工程水文地質(zhì)條件、巖土參數(shù)、受荷性質(zhì)及大小等影響因素往往具有不確定性，所以，開(kāi)展山區(qū)樁-柱式橋梁樁基可靠性分析研究具有重要的理論和實(shí)際意義。目前有關(guān)樁基承載力可靠性分析的研究成果較多，但針對(duì)樁基變形（沉降與水平位移）可靠性分析研究成果很少。為此，本文以龍永高速公路K82+965段大壩2號(hào)大橋樁-柱式橋梁樁基為依托工程，通過(guò)構(gòu)建基樁的沉降和水平變形可靠性分析計(jì)算模型，對(duì)大壩2號(hào)大橋左幅中的1~6#墩橋梁基樁沉降和水平變形可靠性進(jìn)行較深入分析研究。 首先，綜合分析了現(xiàn)有橋梁基樁沉降、水平受力與變形計(jì)算以及基樁可靠度計(jì)算的研究現(xiàn)狀；其次，基于剪切位移法，建立了山區(qū)樁-柱式橋梁基樁沉降計(jì)算模型，得到了相應(yīng)的基樁沉降計(jì)算方法，并據(jù)此提出了基于改進(jìn)Rosenblueth法樁-柱式橋梁基樁沉降可靠度指標(biāo)計(jì)算方法；然后，分析了山區(qū)樁-柱式橋梁基樁的受力特點(diǎn)及破壞模式，通過(guò)建立樁-柱式橋梁基樁水平受力簡(jiǎn)化計(jì)算模型，導(dǎo)出了各特征樁段的撓曲微分方程，借助冪級(jí)數(shù)法，得到了水平荷載作用下山區(qū)樁-柱式橋梁基樁內(nèi)力與變形計(jì)算半解析解答，，同時(shí)基于驗(yàn)算點(diǎn)法，提出了水平荷載作用下山區(qū)樁-柱式橋梁基樁水平變形可靠度指標(biāo)計(jì)算方法；最后，利用本文提出的方法，對(duì)大壩2號(hào)大橋左幅中的1~6#墩中基樁的沉降及水平變形可靠度指標(biāo)及失效概率進(jìn)行了計(jì)算分析，探討了參數(shù)變異性對(duì)基樁沉降及水平變形可靠度指標(biāo)的影響。 此外，工程實(shí)例和算例計(jì)算結(jié)果不僅驗(yàn)證了本文方法可行，而且還為依托工程的設(shè)計(jì)、施工及運(yùn)營(yíng)管理提供了技術(shù)指導(dǎo)。
[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.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U443.1

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