本文選題：動(dòng)三軸試驗(yàn) + 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(chē)輛荷載是一種強(qiáng)度相對(duì)較低、作用周期較長(zhǎng),作用時(shí)間間隔和荷載峰值均是不均勻的隨機(jī)荷載。車(chē)輛荷載長(zhǎng)期作用于路橋過(guò)渡段處,橋臺(tái)產(chǎn)生變形并且橋臺(tái)樁基因承受上部傳來(lái)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(yán)重時(shí)甚至被破壞,使得橋臺(tái)樁體的承載能力大大下降,從而影響路橋正常的通車(chē)運(yùn)營(yíng)。針對(duì)此問(wèn)題,作者通過(guò)土體動(dòng)力試驗(yàn),現(xiàn)場(chǎng)采集隨機(jī)車(chē)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(duì)象進(jìn)行隨機(jī)車(chē)輛荷載下橋臺(tái)樁—土體系沉降的影響進(jìn)行研究,主要工作如下：(1)對(duì)取自阜新地區(qū)城南七號(hào)橋橋址處土體進(jìn)行動(dòng)三軸試驗(yàn),得出了土體動(dòng)力作用的重要參數(shù)。(2)以實(shí)際橋梁為對(duì)象,觀測(cè)并采集了在交通量高峰時(shí)段車(chē)輛密集通過(guò)橋梁時(shí)對(duì)橋臺(tái)產(chǎn)生最大影響情況下的撓度響應(yīng)曲線(xiàn),借助Matlab軟件將其轉(zhuǎn)化為加速度信號(hào),通過(guò)對(duì)橋臺(tái)樁—土體系模型簡(jiǎn)化受力分析,得出行駛中的車(chē)輛對(duì)橋臺(tái)樁—土體系產(chǎn)生的隨機(jī)荷載。(3)借助有限元軟件Midas/GTS對(duì)在隨機(jī)車(chē)輛荷載作用下單樁—土體系的沉降進(jìn)行分析,總結(jié)不同因素對(duì)樁—土體系的影響。(4)以阜新市城南七號(hào)橋?yàn)楣こ瘫尘?對(duì)在隨機(jī)車(chē)輛荷載作用下橋臺(tái)群樁—土體系的沉降進(jìn)行研究分析,得出不同布樁數(shù)量、布樁距離和樁體長(zhǎng)徑比對(duì)橋臺(tái)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(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U443.1

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