【摘要】：注漿技術(shù)作為一種行之有效的地基(地層)處理方法。目前在土木、交通、水利、礦山等許多領(lǐng)域中得到了廣泛的應(yīng)用。然而實(shí)際工程中,不少被注漿地層含細(xì)砂或粉砂土層,采用普通的靜壓等傳統(tǒng)注漿工法很難實(shí)現(xiàn)有效灌注或無法實(shí)現(xiàn)設(shè)計(jì)擴(kuò)散半徑。針對這種情況,最近提出了一種新的注漿方法,真空注漿法。真空注漿即是將真空技術(shù)應(yīng)用于注漿工程,在土體中設(shè)置真空井抽吸被注漿土體中的空氣,使土體產(chǎn)生負(fù)壓,增加真空井與注漿孔之間的孔壓差,達(dá)到在不增加外部靜壓力的情況下就能達(dá)到形成孔壓差的目的,進(jìn)而使?jié){液注入到土體中。本文通過室內(nèi)三維真空注漿模擬試驗(yàn)及真空定向注漿模擬試驗(yàn),對真空注漿在無氣流流動(dòng)和有氣流流動(dòng)兩種工況下進(jìn)行了研究。本文的主要研究內(nèi)容及取得的幾點(diǎn)認(rèn)識包括：(1)首先針對真空注漿的特點(diǎn),設(shè)計(jì)并研制室內(nèi)模擬試驗(yàn)?zāi)Ｐ图捌涿芊夥椒ā?2)通過三維真空注漿模擬試驗(yàn),得到了不同地質(zhì)條件下在不同真空度時(shí)漿液的擴(kuò)散半徑,總結(jié)出了漿液的擴(kuò)散規(guī)律及注漿流量的變化規(guī)律。并運(yùn)用Maag公式計(jì)算得出漿液擴(kuò)散半徑的理論值,通過漿液擴(kuò)散半徑實(shí)際值與理論值的對比,發(fā)現(xiàn)一般情況下,實(shí)際擴(kuò)散半徑均比理論擴(kuò)散半徑��；同種真空度條件下,隨著地層滲透系數(shù)的增大,擴(kuò)散半徑理論值與實(shí)際值之間的差值在增加。(3)通過真空度測試可知,真空度的分布規(guī)律對真空定向注漿效果影響較大,在實(shí)際工程中,可以通過設(shè)置進(jìn)氣井,改變土體內(nèi)負(fù)壓區(qū)邊界及真空場分布,進(jìn)而影響漿液的擴(kuò)散,以達(dá)到需要的定向注漿效果。(4)通過真空定向注漿模擬試驗(yàn),得到了注漿管兩側(cè)擴(kuò)散半徑隨著注漿真空度的變化規(guī)律,真空定向注漿擴(kuò)散效果隨著真空度的增加越來越明顯。
[Abstract]:Grouting technology is an effective treatment method for foundation (stratum). At present, it has been widely used in many fields, such as civil engineering, transportation, water conservancy, mining and so on. However, in practical engineering, many grouting strata contain fine sand or silt soil, so it is difficult to realize effective grouting or design diffusion radius by using conventional grouting methods such as hydrostatic pressure. In view of this situation, a new grouting method, vacuum grouting, has been proposed recently. Vacuum grouting is the application of vacuum technology in grouting engineering. A vacuum well is set up in the soil to draw air from the soil to produce negative pressure and increase the hole pressure difference between the vacuum well and the grouting hole. The pore pressure difference can be formed without increasing the external static pressure, and then the slurry can be injected into the soil. In this paper, the three dimensional vacuum grouting simulation test and the vacuum directional grouting simulation test are used to study the vacuum grouting under the two conditions of airflow and airflow. The main contents of this paper are as follows: (1) according to the characteristics of vacuum grouting, an indoor simulation test model and its sealing method are designed and developed. (2) through three-dimensional vacuum grouting simulation test, The diffusive radius of slurry under different geological conditions under different vacuum degree is obtained, and the diffusion law of grouting fluid and the variation law of grouting flow rate are summarized. The theoretical value of the slurry diffusion radius is calculated by using Maag formula. By comparing the actual value with the theoretical value, it is found that the actual diffusion radius is smaller than the theoretical diffusion radius under the same vacuum condition. With the increase of formation permeability coefficient, the difference between the theoretical value of diffusion radius and the actual value is increasing. (3) through the vacuum degree test, it can be seen that the distribution law of vacuum degree has a great influence on the effect of vacuum directional grouting. The boundary of negative pressure zone and the distribution of vacuum field in soil can be changed by setting intake well, and then the diffusion of slurry can be affected, so as to achieve the desired directional grouting effect. (4) through the simulation test of vacuum directional grouting, The variation of the diffusion radius of the two sides of the grouting pipe with the grouting vacuum degree is obtained, and the effect of the vacuum directional grouting diffusion becomes more and more obvious with the increase of the vacuum degree.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU753

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