【摘要】：隨著公路交通事業(yè)的發(fā)展,高速公路向山區(qū)不斷延伸,為保護(hù)山區(qū)環(huán)境及滿足路線線形的要求,高速公路往往采用橋梁結(jié)構(gòu)。然而,面對山區(qū)橫坡段橋梁樁基的大量出現(xiàn),尚缺乏與之相適應(yīng)的設(shè)計計算規(guī)范。因此,本文針對橫坡段橋梁樁基承載機(jī)理、內(nèi)力和位移等問題,開展了以下研究工作:(1)基于橫坡段橋梁樁基的受荷特點(diǎn),綜合分析了樁基在豎向、橫向、傾斜及組合荷載作用下的承載機(jī)理,推導(dǎo)了樁側(cè)邊坡下滑推力的計算公式,分析了樁側(cè)巖土體抗力的計算方法及其分布規(guī)律。(2)通過對橫坡段橋梁基樁進(jìn)行受力分析,得到基樁自由段、受荷段、嵌固段的撓曲微分方程,并對其采用冪級數(shù)法進(jìn)行求解。在此基礎(chǔ)上,開展了不同參數(shù)對其受力特性的影響因素分析,分析表明:當(dāng)滑動面位置較淺時,“陡坡效應(yīng)”顯著,基樁上部有較大的內(nèi)力和位移;推力分布形式對基樁的內(nèi)力和位移有一定影響,設(shè)計中采用三角形分布,計算結(jié)果偏于危險;樁徑的合理設(shè)計可以改善基樁的內(nèi)力和位移;基樁的內(nèi)力和位移與坡體下滑推力合力及樁頂橫向荷載呈正相關(guān),與受荷段地基抗力折減系數(shù)呈負(fù)相關(guān)。(3)基于橫坡段橋梁雙樁結(jié)構(gòu)的特點(diǎn),建立了前后樁各特征樁段的撓曲微分方程,提出了橫坡段橋梁雙樁結(jié)構(gòu)受力分析計算方法。在此基礎(chǔ)上,開展了不同參數(shù)對其受力特性的影響因素分析,分析表明:前后樁樁頂水平位移及樁身最大彎矩與樁間距、樁側(cè)邊坡下滑推力合力呈正相關(guān),與受荷段地基抗力比例系數(shù)呈負(fù)相關(guān);前樁自由段過大,將導(dǎo)致“P-Δ效應(yīng)”顯著。(4)通過對某橫坡段橋梁雙樁結(jié)構(gòu)進(jìn)行受力計算,并與有限元計算結(jié)果對比分析,驗(yàn)證了本文橫坡段橋梁雙樁結(jié)構(gòu)受力分析計算方法的可靠性,且分析表明該工程實(shí)際設(shè)計的合理性。
[Abstract]:With the development of highway traffic, the highway extends to the mountain area continuously. In order to protect the environment of the mountain area and meet the requirement of the route line, the highway often adopts the bridge structure. However, in the face of a large number of bridge pile foundations in the mountainous cross-slope section, there is still a lack of corresponding design and calculation code. Therefore, aiming at the bearing mechanism, internal force and displacement of bridge pile foundation in transverse slope section, the following research work has been carried out: (1) based on the characteristics of bridge pile foundation in transverse slope section, the vertical and horizontal pile foundation is comprehensively analyzed. Under the action of inclined and combined loads, the calculation formula of sliding thrust force of pile side slope is derived, and the calculation method of pile side rock soil resistance and its distribution law are analyzed. (2) the stress analysis of bridge foundation pile in transverse slope section is carried out. The flexural differential equations of free segment, loaded segment and fixed segment of foundation pile are obtained, and the power series method is used to solve them. On this basis, the influence factors of different parameters on the mechanical characteristics of the pile are analyzed. The results show that when the sliding surface is shallow, the "steep slope effect" is significant, and the upper part of the pile has greater internal force and displacement; The distribution of thrust has a certain influence on the internal force and displacement of the pile, the triangular distribution is used in the design, the calculation result is more dangerous, and the reasonable design of the diameter of the pile can improve the internal force and displacement of the pile. The internal force and displacement of the foundation pile are positively correlated with the sliding thrust force of the slope body and the lateral load on the top of the pile, and are negatively correlated with the coefficient of resistance reduction of the loaded section of the foundation. (3) based on the characteristics of the bridge double-pile structure in the transverse slope section, The flexural differential equation of each characteristic pile section of front and rear piles is established, and the analysis and calculation method of bridge double pile structure in transverse slope section is put forward. On this basis, the influence factors of different parameters on the mechanical characteristics of the pile are analyzed. The analysis shows that the horizontal displacement of the pile top and the maximum bending moment of the pile body are positively correlated with the pile spacing and the sliding thrust force of the pile side slope. There is a negative correlation with the resistance ratio coefficient of the foundation in the loaded section, and the "P- 螖 effect" will be significant if the free section of the front pile is too large. (4) the stress calculation of a bridge with two piles in a transverse slope section is carried out, and the results are compared with those of the finite element method. The reliability of the method for the analysis and calculation of the double-pile structure of the bridge in the transverse slope section of this paper is verified, and the analysis shows that the practical design of the project is reasonable.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U443.15

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