本文選題：軟地基　切入點(diǎn)：真空預(yù)壓法　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著城市基礎(chǔ)設(shè)施、道路和鐵路建設(shè)的進(jìn)一步加快,土地合理利用要求以及線路技術(shù)要求的提高,工程中不可避免會(huì)遇到軟地基的處理問(wèn)題。軟地基處理方法多種多樣,其中真空預(yù)壓法由于其工程量小、成本較低和對(duì)環(huán)境影響較小等優(yōu)點(diǎn),在軟地基處理中得到廣泛應(yīng)用。然而真空預(yù)壓法使用過(guò)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(wèn)題。近年來(lái),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(wèn)題,也加大了地基處理深度。但是在實(shí)際實(shí)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(yàn)。因此本文通過(guò)理論和試驗(yàn)研究方法,開(kāi)展有關(guān)真空井作用范圍的研究,為實(shí)際工程提供一定的借鑒作用。本文首先對(duì)文獻(xiàn)資料分析,認(rèn)為采用排水板真空預(yù)壓法會(huì)出現(xiàn)排水板彎曲、堵塞和加固深度有限等問(wèn)題,并分析了出現(xiàn)這些問(wèn)題的原因。對(duì)工程中采用的真空井代替排水板加固軟地基的真空預(yù)壓法新技術(shù)進(jìn)行了分析,認(rèn)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(jié)作用效果。同時(shí)分析了該方法在實(shí)際應(yīng)用中可能存在許多不確定的因素,而造成固結(jié)沉降效果不佳。本文以土體微觀學(xué)作為理論研究基礎(chǔ),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(jié)論,再結(jié)合真空預(yù)壓法得出加固后地基沉降量與地基承載力值的關(guān)系,繼而提出沉降量計(jì)算出真空井的作用范圍的方法。通過(guò)室內(nèi)試驗(yàn)方法,按照真空預(yù)壓加固技術(shù)原理,對(duì)三種典型土體砂土、淤泥質(zhì)土和粘性土沉降量進(jìn)行實(shí)測(cè),在試驗(yàn)?zāi)Ｐ蜅l件下測(cè)定出三種土體距離真空井由遠(yuǎn)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(yuǎn)及近分別為:1.6cm～2.5cm、3.7cm～6.3cm和2.7cm～5.8cm,通過(guò)結(jié)果對(duì)比發(fā)現(xiàn)實(shí)測(cè)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(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU472.33

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