本文選題：次固結(jié) + 吹填土�。� 參考：《天津大學(xué)》2014年碩士論文

【摘要】：在圍海造陸過(guò)程中,吹填土將經(jīng)歷由液態(tài)泥漿向具有一定強(qiáng)度的可塑態(tài)土體的復(fù)雜轉(zhuǎn)化,伴隨吹填土的結(jié)構(gòu)變化,其工程特性也逐漸發(fā)生著變化。吹填土承壓強(qiáng)度很小、受荷時(shí)壓縮變形大、滲透性差,與其下部的天然土層存在較大的差異。然而,目前對(duì)于吹填場(chǎng)地由不同成因所造成的各深度土層的工程特性差異研究卻少見于報(bào)端。工程實(shí)踐卻表明,經(jīng)加固的吹填土其下部土層不僅是控制地基承載力的關(guān)鍵,也是固結(jié)沉降的主要發(fā)生部位。故有必要加強(qiáng)對(duì)吹填場(chǎng)地各不同深度土層工程特性差異的研究,并在此基礎(chǔ)上提出吹填場(chǎng)地的次固結(jié)變形預(yù)測(cè)模型,以期為工程實(shí)踐提供理論支撐。本文針對(duì)天津?yàn)I海新區(qū)中心漁港真空預(yù)壓已處理吹填場(chǎng)地不同深度土層進(jìn)行了大批室內(nèi)次固結(jié)試驗(yàn)研究,得到了如下主要結(jié)論:提出了吹填土次固結(jié)試驗(yàn)操作方法,彌補(bǔ)了土工試驗(yàn)規(guī)程相應(yīng)部分所存在的空白,該方法有望可作為今后相關(guān)規(guī)范或規(guī)程的補(bǔ)充內(nèi)容。對(duì)吹填場(chǎng)地不同成因的各土層進(jìn)行了大量的室內(nèi)一維次固結(jié)試驗(yàn)研究,分析了不同成因的各土層(吹填土層、含塑料插板的天然土層、塑料插板以下的天然沉積土層)工程特性,并由此得出真空預(yù)壓的影響深度約為20m。利用單向壓縮分級(jí)加載試驗(yàn),經(jīng)過(guò)對(duì)試驗(yàn)成果整理分析,結(jié)合對(duì)吹填場(chǎng)地土次固結(jié)特性的研究,并在Mesri和Godlewski研究的基礎(chǔ)上,建立了次固結(jié)系數(shù)的預(yù)測(cè)模型,并在此基礎(chǔ)上進(jìn)一步推導(dǎo)得到了次固結(jié)變形的預(yù)測(cè)模型,通過(guò)試驗(yàn)值與計(jì)算值的對(duì)比驗(yàn)證了該模型是適用于天津吹填場(chǎng)地的。利用ABAQUS軟件建立樁土接觸共同作用模型,分析了中心漁港地區(qū)樁側(cè)摩阻力在堆載作用、樁頂荷載、時(shí)間效應(yīng)以及群樁效應(yīng)等因素的影響下,樁側(cè)摩阻力隨深度變化的分布規(guī)律。
[Abstract]:During the process of reclamation, the filling soil will undergo complex transformation from liquid mud to plastic soil with a certain strength, and its engineering characteristics will change gradually along with the structural changes of the filling soil. The pressure bearing strength of the filling is very small, the compression deformation is large and the permeability is poor, which is different from the natural soil layer in the lower part. However, at present, the research on the engineering characteristics of different depth soil layer caused by different causes of backfill site is seldom seen in the newspaper. The engineering practice shows that the underlying soil is not only the key to control the bearing capacity of the foundation, but also the main site of consolidation settlement. Therefore, it is necessary to strengthen the study on the difference of engineering characteristics of different depth soil layers in the filling site, and on this basis, to put forward the prediction model of secondary consolidation deformation of the filling site, in order to provide theoretical support for engineering practice. In this paper, a large number of indoor secondary consolidation tests were carried out on different depth soil layers of the central fishing port of Tianjin Binhai New area. The main conclusions are as follows: the operation method of the secondary consolidation test is put forward. The method is expected to be used as a supplement to the relevant codes or regulations in the future. In this paper, a large number of indoor one-dimensional secondary consolidation tests were carried out on each soil layer of different origin of blowing site, and the soil layers of different origin (blowing soil layer, natural soil layer containing plastic insert board) were analyzed. The engineering properties of the natural sedimentary soil layer below the plastic inserting plate) are obtained, and the influence depth of vacuum preloading is about 20m. A prediction model of secondary consolidation coefficient is established on the basis of Mesri and Godlewski by unidirectional compression and graded loading test, through the analysis of test results, combined with the study of the secondary consolidation characteristics of the soil in the blowing site, and on the basis of the research of Mesri and Godlewski, the prediction model of the secondary consolidation coefficient is established. On this basis, the prediction model of secondary consolidation deformation is derived, and the comparison between experimental and calculated values proves that the model is suitable for Tianjin fill site. The pile-soil contact interaction model was established by using ABAQUS software, and the distribution law of pile-side friction with depth was analyzed under the influence of pile load, pile top load, time effect and pile group effect under the influence of pile side friction in central fishing port area.
【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)】：TU447

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