發(fā)布時(shí)間：2018-11-12 13:03

【摘要】：跨海大橋、海上石油平臺(tái)、跨海輸電塔、測風(fēng)塔等近海大型結(jié)構(gòu)服役環(huán)境復(fù)雜,高承臺(tái)群樁基礎(chǔ)受到自身重力、風(fēng)力、水流甚至船舶撞擊力等多種荷載作用,極易引起基礎(chǔ)傾斜倒塌。由多向荷載作用下引起的群樁基礎(chǔ)破壞失效屢有報(bào)道。目前國內(nèi)外對于多向荷載下群樁基礎(chǔ)計(jì)算分析方法研究較少,亟需開展相應(yīng)研究工作。 本文針對高承臺(tái)群樁基礎(chǔ)多向共同受荷問題,建立了由剛性承臺(tái)—彈性梁—土非線性彈簧組成的群樁計(jì)算模型。采用水平p-y曲線法、豎向荷載傳遞法、扭轉(zhuǎn)τ-y曲線法,計(jì)算基樁在各自由度上的非線性剛度。模型考慮了群樁效應(yīng)和基樁推扭耦合效應(yīng)；水平受荷群樁效應(yīng)通過設(shè)置p乘子實(shí)現(xiàn)；基樁推扭耦合效應(yīng)則通過引入修正單樁分析模型實(shí)現(xiàn)。采用牛頓迭代法對計(jì)算模型進(jìn)行求解。 對受推力和扭矩共同作用的大尺寸物理模型試驗(yàn)3×3群樁基礎(chǔ)進(jìn)行了分析,分析結(jié)果與試驗(yàn)結(jié)果基本吻合,表明該計(jì)算方法可靠性良好。通過采用多組p乘子對比分析發(fā)現(xiàn),小偏心水平荷載下水平群樁效應(yīng)更接近于群樁水平單獨(dú)受荷,大偏心水平荷載下水平群樁效應(yīng)更接近于群樁扭轉(zhuǎn)單獨(dú)受荷。通過參數(shù)分析發(fā)現(xiàn),在水平和扭轉(zhuǎn)荷載共同作用下,群樁中各基樁樁頭剪力分配不均勻性十分顯著；獲得了不同樁間距和不同承臺(tái)高度時(shí)群樁中基樁軸力變化規(guī)律,為復(fù)雜荷載下群樁設(shè)計(jì)提供依據(jù)。 本文結(jié)合工程資料和試樁結(jié)果,采用多向荷載下高承臺(tái)群樁計(jì)算方法,實(shí)現(xiàn)了對有斜樁的輸電線路海中鐵塔基礎(chǔ)的計(jì)算分析,獲得了其在多向荷載作用下內(nèi)力分配規(guī)律和變形情況,指導(dǎo)了該工程的設(shè)計(jì)。
[Abstract]:Cross-sea bridges, offshore oil platforms, transoceanic transmission towers, wind towers, and other offshore large-scale structures are in complex service environments, and pile groups with high caps are subjected to various loads such as their own gravity, wind, water flow and even ship impact force. It is easy to cause the foundation to collapse. The failure of pile group foundation caused by multi-directional load has been reported frequently. At present, there are few researches on the calculation and analysis of pile group foundation under multi-direction load, so it is necessary to carry out corresponding research work. In this paper, a calculation model of pile group composed of rigid cap, elastic beam and soil nonlinear spring is established to solve the problem of multi-direction common loading of pile group foundation with high cap. The horizontal p-y curve method, vertical load transfer method and torsion 蟿 -y curve method are used to calculate the nonlinear stiffness of foundation pile on various degrees of freedom. The coupling effect of pile group and pile pushing and torsion is considered in the model. The horizontal pile group effect is realized by setting p multiplier and the coupling effect of pile pushing and torsion is realized by introducing the modified single pile analysis model. Newton iteration method is used to solve the calculation model. The large scale physical model test 3 脳 3 pile group foundation subjected to the combined force and torque is analyzed. The results are in good agreement with the experimental results, which show that the calculation method is reliable. Through the comparative analysis of multiple p multipliers, it is found that the effect of horizontal pile group under small eccentricity horizontal load is closer to that of pile group under horizontal load alone, and the effect of horizontal pile group under large eccentricity horizontal load is closer to that of pile group under torsional load. Through parameter analysis, it is found that under the combined action of horizontal and torsional loads, the uneven distribution of shear force at the pile head of pile group is very significant. The variation law of axial force of pile group in different pile spacing and pile cap height is obtained, which provides the basis for pile group design under complex load. Combined with engineering data and pile test results, the calculation method of pile group with high cap under multi-direction load is adopted in this paper, and the calculation and analysis of the sea tower foundation of transmission line with inclined piles are realized. The law of internal force distribution and deformation under multi-direction load are obtained, and the design of the project is guided.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU473.1

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