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  本文選題：動三軸試驗 + 樁土耦合作用��； 參考：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：車輛荷載是一種強度相對較低、作用周期較長,作用時間間隔和荷載峰值均是不均勻的隨機荷載。車輛荷載長期作用于路橋過渡段處,橋臺產(chǎn)生變形并且橋臺樁基因承受上部傳來的荷載和樁側(cè)土體的沉降的共同作用而出現(xiàn)較大的沉降,嚴重時甚至被破壞,使得橋臺樁體的承載能力大大下降,從而影響路橋正常的通車運營。針對此問題,作者通過土體動力試驗,現(xiàn)場采集隨機車輛荷載和有限元模擬分析相結(jié)合的方法,以阜新地區(qū)為研究對象進行隨機車輛荷載下橋臺樁—土體系沉降的影響進行研究,主要工作如下：(1)對取自阜新地區(qū)城南七號橋橋址處土體進行動三軸試驗,得出了土體動力作用的重要參數(shù)。(2)以實際橋梁為對象,觀測并采集了在交通量高峰時段車輛密集通過橋梁時對橋臺產(chǎn)生最大影響情況下的撓度響應(yīng)曲線,借助Matlab軟件將其轉(zhuǎn)化為加速度信號,通過對橋臺樁—土體系模型簡化受力分析,得出行駛中的車輛對橋臺樁—土體系產(chǎn)生的隨機荷載。(3)借助有限元軟件Midas/GTS對在隨機車輛荷載作用下單樁—土體系的沉降進行分析,總結(jié)不同因素對樁—土體系的影響。(4)以阜新市城南七號橋為工程背景,對在隨機車輛荷載作用下橋臺群樁—土體系的沉降進行研究分析,得出不同布樁數(shù)量、布樁距離和樁體長徑比對橋臺群樁—土體系沉降的影響。
[Abstract]:Vehicle load is a kind of random load with relatively low strength, long period of action, and uneven load time interval and load peak. The vehicle load acts on the transition section of Luqiao for a long time, the abutment is deformed and the abutment pile gene bears the joint action of the load from the upper part and the settlement of the soil body in the pile side. The load-bearing capacity of the abutment pile is greatly reduced even when it is seriously damaged, which affects the normal traffic operation of Luqiao. In view of this problem, the author collects random vehicle load and finite element simulation analysis by soil dynamic test, and carries out the abutment pile under random vehicle load in Fuxin area. The main work of the soil system settlement is as follows: (1) the soil dynamic three axis tests taken from the No. seven bridge site in the south of the city of Fuxin are carried out, and the important parameters of the dynamic action of the soil are obtained. (2) taking the actual bridge as the object, the maximum of the bridge to the abutment is observed and collected when the traffic is high in the high peak period. The deflection response curve under the influence is transformed into an acceleration signal with the help of Matlab software. Through the simplified stress analysis of the abutment pile soil system model, the random load produced by the driving vehicle to the abutment pile soil system is obtained. (3) with the help of the finite element software Midas/GTS, the single pile soil system under the load of random vehicles is used. The settlement is analyzed and the influence of different factors on the pile and soil system is summarized. (4) taking the No. Seven Bridge in Fuxin city as the engineering background, the settlement of the pile and soil system of abutment group under the load of random vehicle is studied and analyzed, and the influence of the number of piles, the distance of the pile and the ratio of the length and diameter of the pile to the settlement of the pile and soil system of the abutment is obtained.

【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U443.1

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