發(fā)布時間：2018-03-03 08:36

  本文選題：軟地基　切入點：真空預壓法　出處：《西南交通大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著城市基礎設施、道路和鐵路建設的進一步加快,土地合理利用要求以及線路技術要求的提高,工程中不可避免會遇到軟地基的處理問題。軟地基處理方法多種多樣,其中真空預壓法由于其工程量小、成本較低和對環(huán)境影響較小等優(yōu)點,在軟地基處理中得到廣泛應用。然而真空預壓法使用過程中發(fā)現(xiàn),排水板常常出現(xiàn)彎曲變形、堵塞和處理深地基效果不明顯等問題。近年來,工程界采用真空井代替了傳統(tǒng)排水板的方法,該方法不僅解決了排水板彎曲的問題,也加大了地基處理深度。但是在實際實施中,真空井的合理作用范圍卻受制于各種條件的限制,作用范圍的確定大多依靠工程人員的經(jīng)驗。因此本文通過理論和試驗研究方法,開展有關真空井作用范圍的研究,為實際工程提供一定的借鑒作用。本文首先對文獻資料分析,認為采用排水板真空預壓法會出現(xiàn)排水板彎曲、堵塞和加固深度有限等問題,并分析了出現(xiàn)這些問題的原因。對工程中采用的真空井代替排水板加固軟地基的真空預壓法新技術進行了分析,認為該方法加固深度更大,并且可避免如排水板彎曲變形而降低軟土地基固結作用效果。同時分析了該方法在實際應用中可能存在許多不確定的因素,而造成固結沉降效果不佳。本文以土體微觀學作為理論研究基礎,分析得出滲透系數(shù)和孔隙比越大,則土體壓縮模量越小的結論,再結合真空預壓法得出加固后地基沉降量與地基承載力值的關系,繼而提出沉降量計算出真空井的作用范圍的方法。通過室內試驗方法,按照真空預壓加固技術原理,對三種典型土體砂土、淤泥質土和粘性土沉降量進行實測,在試驗模型條件下測定出三種土體距離真空井由遠及近沉降量分別為:2.4cm～3.1cm、3.9cm～6.7cm、3.3cm～6.2cm,理論沉降量由遠及近分別為:1.6cm～2.5cm、3.7cm～6.3cm和2.7cm～5.8cm,通過結果對比發(fā)現(xiàn)實測沉降規(guī)律與理論值基本吻合。
[Abstract]:With the further acceleration of urban infrastructure, the construction of roads and railways, the improvement of the requirements of rational land use and the technical requirements of railway lines, the problems of soft foundation treatment will inevitably be encountered in engineering. There are various methods for soft foundation treatment. The vacuum preloading method is widely used in soft foundation treatment because of its advantages of low engineering quantity, low cost and small environmental impact. However, it is found that the drainage plate often appears bending deformation during the use of vacuum preloading method. In recent years, the method of vacuum well instead of traditional drainage plate has been adopted in engineering field, which not only solves the problem of drainage plate bending, But in practice, the reasonable range of action of vacuum well is limited by various conditions, and the determination of the scope of action mostly depends on the experience of engineers. Therefore, in this paper, through theoretical and experimental research methods, The study on the action range of vacuum well can be used for reference in practical engineering. Firstly, the paper analyzes the literature, and points out that the drainage plate bending, blockage and reinforcement depth will occur by using vacuum preloading method of drainage plate, and so on. The causes of these problems are also analyzed. The new vacuum preloading method used in the project to replace the drainage plate for strengthening soft foundation is analyzed. It is considered that the depth of the method is greater than that of the vacuum preloading method. And it can avoid the bending deformation of drainage plate and reduce the consolidation effect of soft soil foundation. At the same time, many uncertain factors may exist in the practical application of this method. But the effect of consolidation settlement is not good. In this paper, the microcosmic soil is taken as the theoretical basis, and the conclusion is drawn that the larger the permeability coefficient and the porosity ratio, the smaller the compression modulus of soil. Combined with the vacuum preloading method, the relationship between the settlement of the reinforced foundation and the bearing capacity of the foundation is obtained, and then the method of calculating the range of action of the vacuum well by the settlement is put forward. The settlement of three kinds of typical soil sand, silt and clayey soil was measured. Under the experimental model condition, three kinds of soil from far and near to vacuum well were determined to be: 1 2.4 cm ~ 3. 1 cm ~ 3. 9 cm ~ (-1) cm ~ (3. 9) cm ~ (3) ~ (3) cm ~ (-1) ~ 6 ~ (2) cm ~ (-2) cm ~ (-1), and the theoretical settlement value of 3. 3 cm ~ 6 ~ 2 cm ~ (-3) cm ~ (-1) from far to near is found to be 6. 3 cm and 2. 7 cm ~ (5) cm ~ (-5) cm ~ (-1), respectively.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU472.33

【參考文獻】

相關期刊論文 前10條

1 薛寶剛;;土建工程軟土地基處理技術管理對策[J];科技與企業(yè);2016年09期

2 張茹;劉水;馬璐瑤;;淺談單井抽水的影響半徑計算[J];科技風;2015年10期

3 李海濤;章定文;孫文博;;劈裂真空預壓法在阜建高速公路軟基處理中的應用[J];公路與汽運;2015年02期

4 莫宏飛;;道路施工軟地基處理和控制技術研究[J];科技資訊;2012年33期

5 劉松玉;韓文君;章定文;杜廣印;;劈裂真空法加固軟土地基試驗研究[J];巖土工程學報;2012年04期

6 李寧;李向鳳;吳躍東;;真空壓力傳遞規(guī)律與滲透系數(shù)關系的試驗研究[J];路基工程;2011年04期

7 朱群峰;高長勝;楊守華;張凌;李東兵;汪璋淳;;超軟淤泥地基處理中真空度傳遞特性研究[J];巖土工程學報;2010年09期

8 張帆;;二種先進的高壓噴射注漿工藝[J];巖土工程學報;2010年S2期

9 楊磊;賀為民;周楊;張清明;;深層攪拌樁復合地基的優(yōu)化設計[J];巖土力學;2010年08期

10 葉觀寶;萇紅濤;徐超;邢皓楓;;無填料振沖法在液化粉細砂中的應用研究[J];巖土工程學報;2009年06期

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本文編號：1560297