【摘要】：插入式大圓筒結(jié)構(gòu)對(duì)于港口工程中常見(jiàn)的軟土地基有很強(qiáng)的適應(yīng)性,其沉降問(wèn)題與軟土地基的性狀有密切關(guān)聯(lián),傳統(tǒng)的沉降計(jì)算方法只考慮地基土的彈塑性,不考慮土體的流變性,忽視了軟土地基的長(zhǎng)期蠕變變形。本文基于濱海相軟土流變理論,對(duì)插入式大圓筒蠕變沉降的發(fā)展變化規(guī)律進(jìn)行了深入研究。本文以濱海相軟土的蠕變?cè)囼?yàn)數(shù)據(jù)為基礎(chǔ),選用彈塑性本構(gòu)關(guān)系與時(shí)間硬化蠕變率,反映土體的應(yīng)力-應(yīng)變-時(shí)間關(guān)系,并通過(guò)模擬濱海相原狀土的三軸蠕變?cè)囼?yàn)對(duì)參數(shù)的選取予以驗(yàn)證。在此基礎(chǔ)上,應(yīng)用有限元軟件ABAQUS建立了插入式大圓筒結(jié)構(gòu)的三維有限元模型,對(duì)結(jié)構(gòu)的蠕變沉降進(jìn)行了深入的探索和研究,得到10年內(nèi)蠕變沉降的發(fā)展變化規(guī)律。進(jìn)一步探究結(jié)構(gòu)蠕變沉降的影響因素,探討了圓筒直徑、入土深度、外部荷載、布置方式對(duì)結(jié)構(gòu)10年內(nèi)蠕變沉降的發(fā)展變化規(guī)律的影響。并引入無(wú)量綱參數(shù)靈敏度,表征各參數(shù)改變時(shí)蠕變沉降的響應(yīng)量變化程度,量化各因素對(duì)蠕變沉降的影響程度�；趩我灰蛩胤治龇�,得到了一些有意義的結(jié)論:圓筒直徑越大,結(jié)構(gòu)的蠕變沉降越大;圓筒入土深度越大,結(jié)構(gòu)的蠕變沉降越小;作用于結(jié)構(gòu)的外部荷載越大,結(jié)構(gòu)的蠕變沉降越大;圓筒單個(gè)插入產(chǎn)生的蠕變沉降及總沉降小于圓筒連排插入,單排插入產(chǎn)生的蠕變沉降及總沉降小于雙排插入;各影響因素對(duì)結(jié)構(gòu)蠕變沉降產(chǎn)生的影響程度由大到小依次為圓筒直徑、入土深度、布置方式、外部荷載。依據(jù)研究成果,可為結(jié)構(gòu)的優(yōu)化設(shè)計(jì)提供一些有益的建議:在工程中,減小圓筒直徑,增大圓筒入土深度,均是降低結(jié)構(gòu)蠕變沉降的有效途徑;在施工條件和吊裝運(yùn)輸條件允許時(shí),應(yīng)盡量采用單排布置。
[Abstract]:The inserted large cylinder structure has strong adaptability to the common soft soil foundation in port engineering. The settlement problem is closely related to the behavior of the soft soil foundation. The traditional settlement calculation method only considers the elastoplastic properties of the foundation soil. The long-term creep deformation of soft soil foundation is neglected without considering the rheology of soil. Based on the rheological theory of coastal soft soil, the development and variation of creep settlement of inserted large cylinder have been deeply studied in this paper. Based on the creep test data of coastal soft soil, the elasto-plastic constitutive relation and time hardening creep rate are selected to reflect the stress-strain-time relationship of soil. The selection of parameters is verified by simulating the triaxial creep test of undisturbed coastal soil. On the basis of this, the three-dimensional finite element model of the inserted large cylinder structure is established by using the finite element software ABAQUS. The creep settlement of the structure is deeply explored and studied, and the development and change rule of creep settlement within 10 years is obtained. The influence factors of creep settlement and the influence of cylinder diameter, depth of soil entry, external load and arrangement mode on the development and variation of creep settlement of structure in 10 years are discussed. The sensitivity of dimensionless parameters is introduced to characterize the change degree of the response amount of creep settlement when each parameter is changed, and the influence degree of each factor on creep settlement is quantified. Based on the single factor analysis, some meaningful conclusions are drawn: the larger the diameter of the cylinder is, the greater the creep settlement of the structure is, the greater the depth of the cylinder entering the soil is, the smaller the creep settlement of the structure is. The greater the external load on the structure, the greater the creep settlement of the structure, the creep settlement and total settlement produced by single cylinder insertion is less than that by cylinder continuous insertion, and the creep settlement and total settlement by single row insertion is less than that by double row insertion, and the creep settlement caused by single row insertion is less than that by double row insertion. The influence degree of each influence factor on the creep settlement of the structure is the diameter of cylinder, the depth of entering soil, the arrangement mode and the external load from large to small. According to the research results, some useful suggestions can be provided for the optimum design of the structure: in the engineering, reducing the diameter of the cylinder and increasing the depth of the cylinder entering the soil are the effective ways to reduce the creep settlement of the structure; Single row arrangement should be used as far as possible when construction conditions and lifting transportation conditions permit.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU433

【相似文獻(xiàn)】

相關(guān)期刊論文 前6條

1 何耀星;徐慧龍;;注重安全 力求準(zhǔn)確——建立插入式流量?jī)x操作規(guī)程[J];科技致富向?qū)?2013年09期

2 王樂(lè)芹,周錫y=,張偉;軟粘土中插入式大直徑薄壁圓筒結(jié)構(gòu)的一種極限狀態(tài)分析模型[J];海洋技術(shù);2005年01期

3 李黎,唐家祥,熊世樹(shù),黎丹;角鋼插入式基礎(chǔ)抗拔試驗(yàn)與分析[J];實(shí)驗(yàn)力學(xué);1999年03期

4 袁蕾;姜忻良;;考慮插入式墻板抗側(cè)作用輕型活動(dòng)房有限元分析[J];工程力學(xué);2012年S2期

5 謝東呈;夾式蚊香架[J];青年科學(xué);2005年10期

6 ;[J];;年期

相關(guān)會(huì)議論文 前4條

1 薛慧君;段海庭;;主角鋼插入式基礎(chǔ)修復(fù)加強(qiáng)方法探討[A];中國(guó)科學(xué)技術(shù)協(xié)會(huì)2008防災(zāi)減災(zāi)論壇論文集[C];2008年

2 汲長(zhǎng)松;謝良年;張淑蘭;張樹(shù)衡;;BH5047型插入式高靈敏砂水分測(cè)量?jī)x[A];第十屆全國(guó)核電子學(xué)與核探測(cè)技術(shù)學(xué)術(shù)年會(huì)論文集[C];2000年

3 彭立才;陳土勝;張楚勇;;角鋼插入式基礎(chǔ)抗拔破壞機(jī)理研究[A];第一屆中國(guó)水利水電巖土力學(xué)與工程學(xué)術(shù)討論會(huì)論文集（下冊(cè)）[C];2006年

4 董凱;劉繼周;;插入式鋼柱施工技術(shù)在超高層鋼混結(jié)構(gòu)施工中的應(yīng)用[A];2013年全國(guó)鋼結(jié)構(gòu)技術(shù)學(xué)術(shù)交流會(huì)論文集[C];2013年

相關(guān)重要報(bào)紙文章 前2條

1 本報(bào)記者 鄺小平;在家里做洗腸手術(shù)[N];廣東科技報(bào);2004年

2 四川 鄧飛;用CSS為圖像扮酷[N];電腦報(bào);2002年

相關(guān)博士學(xué)位論文 前1條

1 王樂(lè)芹;插入式大直徑薄壁圓筒結(jié)構(gòu)承載機(jī)理研究與優(yōu)化設(shè)計(jì)[D];天津大學(xué);2005年

相關(guān)碩士學(xué)位論文 前4條

1 張迪;語(yǔ)料庫(kù)視域下通過(guò)插入式引語(yǔ)對(duì)文學(xué)作品中人物的探究[D];太原理工大學(xué);2016年

2 王曉宇;插入式大圓筒蠕變沉降的影響因素及靈敏度分析[D];天津大學(xué);2014年

3 張?chǎng)?插入式箱型進(jìn)海路結(jié)構(gòu)研究[D];天津大學(xué);2012年

4 李偉儀;插入式鋼質(zhì)大圓筒岸壁結(jié)構(gòu)的設(shè)計(jì)研究[D];河海大學(xué);2007年

，

本文編號(hào)：2470735