本文關(guān)鍵詞： 樁基礎(chǔ) 陡坡 屈曲 能量法 數(shù)值模擬 影響因素　出處：《湖南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國西部大開發(fā)戰(zhàn)略的大力推進(jìn)，山區(qū)高速公路、鐵路建設(shè)得到飛速發(fā)展。受山區(qū)復(fù)雜地形地貌及工程水文地質(zhì)條件的限制，不少橋梁基樁不得不修建于陡坡地段。陡坡段橋梁基樁，，既要承受樁頂豎向及水平荷載，還要受到來自坡體的剩余下滑力以及承受巖(土)體地基抗力作用，受力特性十分復(fù)雜。此外，由于陡坡段基樁通常自由段長度大，使其穩(wěn)定性問題更加突出，常規(guī)設(shè)計方法難以滿足工程實際的需要。因此，本文針對陡坡段橋梁基樁工程環(huán)境的特殊性、承載機理的復(fù)雜性，提出了一套符合其受力特性的穩(wěn)定性分析方法，以期為陡坡段橋梁基樁的屈曲穩(wěn)定分析提供參考。 本文首先深入研究了陡坡段橋梁基樁受力特性及屈曲機理，對比分析了其與常規(guī)基樁的主要區(qū)別，重點考慮了“陡坡效應(yīng)”對基樁的影響。在此基礎(chǔ)上，考慮樁后坡體剩余下滑力分布規(guī)律及樁前巖土體水平地基抗力弱化效應(yīng)對基樁穩(wěn)定性的影響，建立了陡坡段橋梁基樁屈曲穩(wěn)定分析計算模型； 其次，基于能量法建立了樁-坡體系的總勢能方程，結(jié)合變分原理，導(dǎo)得了陡坡段橋梁基樁屈曲穩(wěn)定的特征方程，通過MATLAB編程求解，得到了陡坡段橋梁基樁屈曲穩(wěn)定臨界荷載及其穩(wěn)定計算長度的解答，并利用相關(guān)試驗驗證了本文理論計算方法。 再次，以實際工程為例，運用ADINA有限元分析軟件，綜合考慮了陡坡段橋梁基樁的受力特點及樁-土相互作用規(guī)律，建立了陡坡段橋梁基樁屈曲穩(wěn)定分析的二維數(shù)值計算模型。通過對模型進(jìn)行求解，得到了相應(yīng)的陡坡段橋梁基樁屈曲臨界荷載，并與理論計算結(jié)果相互驗證。 最后，運用本文提出的理論與數(shù)值計算方法，結(jié)合某工程實例，深入分析了樁身彈性模量、樁徑、嵌固深度、變截面情況、土體分層及樁身傾斜等施工缺陷對陡坡段橋梁基樁屈曲穩(wěn)定性的影響。
[Abstract]:With the great development of western China, the construction of highway and railway in mountainous area has been developed rapidly, which is restricted by the complex terrain and geomorphology of mountain area and the hydrogeological conditions of engineering. Many bridge piles have to be built on steep slopes. In steep slopes, bridge piles not only bear vertical and horizontal loads on the top of the pile, but also are subjected to the residual sliding force from the slope body and to the resistance of the rock (soil) foundation. The mechanical characteristics are very complicated. In addition, because of the large length of pile foundation in steep slope section, the stability problem is more prominent, and the conventional design method is difficult to meet the needs of engineering practice. In view of the particularity of the engineering environment and the complexity of the bearing mechanism of bridge foundation pile in steep slope section, a set of stability analysis methods according to its stress characteristics are put forward in this paper, in order to provide a reference for buckling stability analysis of bridge foundation pile in steep slope section. In this paper, the stress characteristics and buckling mechanism of bridge foundation pile in steep slope section are studied, the main differences between the pile and the conventional pile are analyzed, and the influence of "steep slope effect" on foundation pile is considered. Considering the distribution of residual sliding force and the influence of the weakening effect of the horizontal foundation resistance on the stability of the foundation pile, a calculation model for the buckling stability of the bridge foundation pile in steep slope section is established. Secondly, based on the energy method, the total potential energy equation of pile-slope system is established. Combined with the variational principle, the characteristic equation of buckling stability of bridge foundation pile in steep slope section is derived and solved by MATLAB programming. The solution of the buckling stability critical load and the calculated length of the pile stability of the bridge foundation in steep slope section is obtained, and the theoretical calculation method is verified by the relevant tests. Thirdly, taking the actual project as an example, using ADINA finite element analysis software, considering the stress characteristics and pile-soil interaction law of bridge foundation pile in steep slope section synthetically. A two-dimensional numerical model for buckling stability analysis of bridge foundation pile in steep slope section is established. The critical buckling load of bridge foundation pile in steep slope section is obtained by solving the model, and the theoretical results are verified. Finally, using the theory and numerical calculation method proposed in this paper, combined with an engineering example, the elastic modulus of pile body, pile diameter, embedded depth and variable cross-section are deeply analyzed. The influence of soil layer and pile inclination on the buckling stability of bridge foundation pile in steep slope section.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U443.15

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本文編號：1501978