【摘要】：擋土墻作為一種常見的擋土結(jié)構(gòu),被廣泛應(yīng)用于民用建筑、橋梁工程、公路工程、水利港口工程和鐵路工程中。我國(guó)地處世界兩大地震帶—環(huán)太平洋地震帶和歐亞地震帶之間,是個(gè)地震多發(fā)國(guó)家。地震震害調(diào)查發(fā)現(xiàn),在較強(qiáng)地震作用下,擋土墻會(huì)遭到破壞。因此擋土墻的抗震設(shè)計(jì)是地震結(jié)構(gòu)工程中非常重要的課題,受到了各國(guó)學(xué)者的重視。擋土墻抗震設(shè)計(jì)中計(jì)算土壓力的常用方法是物部岡部法,但這種方法沒(méi)有考慮擋土墻與土體之間的相互作用,更多應(yīng)用在剛性擋土墻抗震設(shè)計(jì)中。本研究基于改進(jìn)Vlasov地基模型,對(duì)柔性懸臂式擋土墻在墻底固支和墻底鉸支兩種位移模式下的水平向地震動(dòng)響應(yīng)進(jìn)行了分析。首先,在沒(méi)有考慮土體中的豎向位移的前提下,對(duì)水平向地震作用下的擋土墻-土系統(tǒng)提出一個(gè)新的位移模式。其次,根據(jù)Hamilton原理,得到自由場(chǎng)位移;進(jìn)而考慮土-墻相互作用,得到了擋土墻位移和衰減函數(shù)的控制方程以及邊界條件,這兩個(gè)控制方程是相互耦合的。再次,通過(guò)一個(gè)迭代程序來(lái)實(shí)現(xiàn)解耦。與此同時(shí),與已有方法結(jié)果對(duì)比,驗(yàn)證本文方法的正確性。最后,對(duì)擋土墻-土系統(tǒng)性能以及地震激勵(lì)下的動(dòng)響應(yīng)進(jìn)行了參數(shù)分析。參數(shù)分析表明:水平向地震作用下,擋土墻自身剛度、激勵(lì)頻率、擋土墻的約束條件都是影響擋土墻-土動(dòng)響應(yīng)的重要因素。本文創(chuàng)新點(diǎn)是:(1)提出一個(gè)新的擋土墻-土位移模式;(2)在改進(jìn)Vlasov地基模型基礎(chǔ)上,建立了的擋土墻-土模型,得到了擋土墻水平向諧和荷載下的動(dòng)響應(yīng)解析解;(3)針對(duì)擋土墻水平向地震動(dòng)響應(yīng),提出有明確力學(xué)意義的物理模型,并在Veletsos和Younan模型的基礎(chǔ)上,提出了聯(lián)系一系列彈簧并模擬土體連續(xù)性的土膜,其中彈簧剛度和土膜的參數(shù)具有詳細(xì)的表達(dá)式。
[Abstract]:As a common retaining structure, retaining wall is widely used in civil construction, bridge engineering, highway engineering, water conservancy and port engineering and railway engineering. China is a earthquake-prone country located between the Pacific Rim seismic belt and Eurasian seismic belt. The earthquake damage investigation found that the retaining wall would be damaged under the strong earthquake. Therefore, seismic design of retaining wall is a very important subject in seismic structure engineering, which has been paid attention by scholars all over the world. In seismic design of retaining wall, the common method of calculating earth pressure is the method of object section, but this method does not take into account the interaction between retaining wall and soil, so it is more widely used in seismic design of rigid retaining wall. Based on the improved Vlasov foundation model, the horizontal ground motion response of flexible cantilever retaining wall is analyzed under two displacement modes of retaining wall bottom clamping and bottom hinge support. Firstly, a new displacement model of retaining wall soil system under horizontal earthquake is proposed without considering the vertical displacement in soil. Secondly, according to the Hamilton principle, the free field displacement is obtained, and the governing equations and boundary conditions of the displacement and attenuation function of the retaining wall are obtained considering the soil-wall interaction. The two governing equations are coupled with each other. Thirdly, decoupling is realized by an iterative procedure. At the same time, the correctness of the proposed method is verified by comparing the results with the existing methods. Finally, the performance of retaining wall-soil system and the dynamic response under earthquake excitation are analyzed. The parameter analysis shows that the stiffness of retaining wall itself, excitation frequency and constraint conditions of retaining wall are important factors that affect the dynamic response of retaining wall under horizontal earthquake. The innovations of this paper are as follows: (1) a new retaining wall-soil displacement model is proposed; (2) based on the improved Vlasov foundation model, the retaining wall-soil model is established, and the analytical solution of the dynamic response of the retaining wall under the horizontal harmonic load is obtained. (3) aiming at the horizontal ground motion response of retaining wall, a physical model with definite mechanical significance is proposed. Based on the Veletsos and Younan models, a series of springs are proposed to simulate the continuity of soil. The spring stiffness and the parameters of the soil film are expressed in detail.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU476.4

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