本文關(guān)鍵詞： 船閘閘室 復(fù)合地基 數(shù)值模擬 ABAQUS　出處：《重慶交通大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：軟土地基具有“三高三低”的特性,即高含水量、高孔隙比、高壓縮性,低強(qiáng)度、低滲透性、低固結(jié)系數(shù)。為了克服軟土地基的以上不足,工程中常采用復(fù)合地基法對(duì)軟基進(jìn)行加固。復(fù)合地基具有比天然地基更高的承載力、控制變形等特性,同時(shí),又比樁基經(jīng)濟(jì),因此在工程中得到越來(lái)越廣泛的應(yīng)用,并取得了很好的經(jīng)濟(jì)效益和社會(huì)效益。近年來(lái),國(guó)內(nèi)外學(xué)者對(duì)復(fù)合地基的工作機(jī)理、沉降變形以及承載特性等開(kāi)展了大量的研究,取得了豐富的成果。但其理論研究仍然遠(yuǎn)遠(yuǎn)落后于工程實(shí)踐,其作用機(jī)理及設(shè)計(jì)理論的研究尚處于發(fā)展之中,不夠成熟。尤其在船閘工程領(lǐng)域,雖然復(fù)合地基已得到廣泛應(yīng)用,但在工程運(yùn)用中大多是參考類(lèi)似工程經(jīng)驗(yàn)加以選擇,關(guān)于復(fù)合地基與船閘結(jié)構(gòu)的計(jì)算問(wèn)題,是船閘設(shè)計(jì)中尚待解決的問(wèn)題。本文基于ABAQUS有限元軟件,結(jié)合清遠(yuǎn)水利樞紐二線船閘工程項(xiàng)目,將船閘結(jié)構(gòu)、褥墊層、復(fù)合地基以及樁端下臥層土體四者視為一個(gè)相互作用的整體,建立了閘室結(jié)構(gòu)-復(fù)合地基三維整體有限元模型,分析在不同工況下的閘室結(jié)構(gòu)位移和應(yīng)力特征,復(fù)合地基承載性狀及其影響因素,從而得出一些對(duì)復(fù)合地基上船閘結(jié)構(gòu)具有參考價(jià)值的結(jié)果,為該類(lèi)型的結(jié)構(gòu)設(shè)計(jì)提供參考。具體工作如下:(1)研究在完建、檢修、低水位運(yùn)行及高水位運(yùn)行四種工況下,閘室結(jié)構(gòu)的位移和應(yīng)力特征,分析閘室結(jié)構(gòu)在不同工況下的位移和應(yīng)力規(guī)律。(2)研究在完建、檢修、低水位運(yùn)行及高水位運(yùn)行四種工況下,復(fù)合地基的地基沉降、地基反力、樁頂位移、樁身應(yīng)力、樁土荷載分擔(dān)比、樁土應(yīng)力比等力學(xué)性狀。(3)采用單因素分析法,分別改變樁長(zhǎng)、樁體模量、褥墊層壓縮模量等影響因素,分析復(fù)合地基的承載性狀和閘室結(jié)構(gòu)的力學(xué)響應(yīng),通過(guò)對(duì)比分析,研究它們的影響規(guī)律。
[Abstract]:Soft soil foundation has the characteristics of "three high and three low", that is, high water content, high void ratio, high compressibility, low strength, low permeability and low coefficient of consolidation. In engineering, composite foundation is often used to reinforce soft foundation. Composite foundation has higher bearing capacity than natural foundation, controlling deformation and so on. At the same time, it is more and more widely used in engineering because it is more economical than pile foundation. In recent years, scholars at home and abroad have carried out a lot of research on the working mechanism, settlement and deformation of composite foundation, as well as bearing characteristics, etc. Many achievements have been made, but its theoretical research is still far behind the engineering practice, and the research on its mechanism and design theory is still in the process of development and not mature enough, especially in the field of ship lock engineering, although the composite foundation has been widely used. However, in engineering application, most of them are selected by reference to similar engineering experience. The calculation of composite foundation and lock structure is an unsolved problem in the design of ship lock. This paper is based on ABAQUS finite element software. Combined with the second line shiplock project of Qingyuan Water Conservancy Project, the shiplock structure, cushion layer, composite foundation and the soil under the pile end are regarded as an interactive whole, and a three-dimensional integral finite element model of the sluice chamber structure and composite foundation is established. The displacement and stress characteristics of gate chamber structure under different working conditions, bearing behavior of composite foundation and its influencing factors are analyzed, and some results of reference value for shiplock structure on composite foundation are obtained. The specific work is as follows: 1) to study the displacement and stress characteristics of the sluice chamber structure under four working conditions: finished construction, overhaul, low water level operation and high water level operation. This paper analyzes the displacement and stress law of gate chamber structure under different working conditions. (2) study on the settlement of foundation, reaction force of foundation, displacement of pile top, stress of pile body under four working conditions of construction, overhaul, operation of low water level and operation of high water level. Single factor analysis method is used to analyze the bearing behavior of composite foundation and the mechanical response of sluice chamber structure by changing the influence factors such as pile length, pile modulus, cushion compression modulus and so on, by means of single factor analysis, such as pile-soil load-sharing ratio, pile-soil stress ratio and pile-soil stress ratio. Through comparative analysis, the influence law of them is studied.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U641

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本文編號(hào)：1524628