【摘要】：注漿技術(shù)是一種有效的加固地層、止水堵漏的方法。由于其施工工藝簡(jiǎn)單,適用范圍廣泛,所以在很多工程中得到了應(yīng)用。注漿工藝適用的地層一般孔隙度較大或者在巖石裂隙中使用。然而,在實(shí)際工程中,常常會(huì)碰到孔隙度較小的砂土地層,當(dāng)用傳統(tǒng)的靜壓注漿工藝進(jìn)行施工時(shí),不是漿液的擴(kuò)散半徑不能滿足要求,就是注漿壓力過(guò)大造成地面隆起、開(kāi)裂等現(xiàn)象,給工程施工帶來(lái)了很大麻煩。近些年,一些學(xué)者研究了一種新的注漿工藝—真空注漿在粉細(xì)砂土層中的應(yīng)用,取得了良好的效果,但是在滲透性更差的粘土地層的研究較為缺乏。由于粘土本身的特殊性,它的滲透性不但與孔隙度大小有關(guān),還和粘土顆粒表面的結(jié)合水和雙電層厚度也有很大關(guān)系。基于這種情況,針對(duì)非飽和粘土地層進(jìn)行真空注漿技術(shù)試驗(yàn)研究有很重要的意義。本文通過(guò)室內(nèi)模擬試驗(yàn),分析了真空?qǐng)鰧?duì)非飽和粘性土體性質(zhì)的影響,通過(guò)試驗(yàn)得到了漿液在非飽和粘性土體中的擴(kuò)散規(guī)律并論證了真空?qǐng)龊驼惩翝B透率的關(guān)系。本文的研究?jī)?nèi)容主要包括:(1)針對(duì)非飽和粘性土的性質(zhì)及真空注漿試驗(yàn)的特點(diǎn),自主設(shè)計(jì)了微型抽真空模型盒。(2)通過(guò)室內(nèi)試驗(yàn)確定了酸性水玻璃漿液的合適配比,分析了溫度對(duì)酸性水玻璃漿液凝膠時(shí)間和粘度的影響規(guī)律,以根據(jù)實(shí)驗(yàn)室溫度選擇合適的漿液配比。(3)通過(guò)微型抽真空模擬裝置分析了不同抽真空時(shí)間和真空度大小對(duì)粘土中結(jié)合水和雙電層的影響,并通過(guò)熱重分析儀和Zeta電位儀進(jìn)行測(cè)定并總結(jié)了影響規(guī)律。(4)進(jìn)行了真空注漿模擬試驗(yàn),對(duì)土體進(jìn)行不同抽氣時(shí)間和不同真空度下的注漿試驗(yàn),分析注漿量、漿液擴(kuò)散半徑、擴(kuò)散時(shí)間和注漿固結(jié)體的形狀的變化規(guī)律,總結(jié)并論證了真空?qǐng)鰧?duì)非飽和粘性土滲透率的影響。
[Abstract]:Grouting technology is an effective method to reinforce strata and stop leakage. Because of its simple construction technology and wide range of application, it has been applied in many projects. Grouting technology is generally suitable for large porosity in strata or used in rock fissures. However, in practical projects, sand strata with low porosity are often encountered. When the traditional static pressure grouting technology is used for construction, either the diffusion radius of the slurry cannot meet the requirements, or the grouting pressure is too large to cause the ground uplift. Cracking and other phenomena have brought a lot of trouble to the construction of the project. In recent years, some scholars have studied a new grouting technology-vacuum grouting in fine silty sand soil, and achieved good results, but there is a lack of research in clay strata with worse permeability. Due to the particularity of clay itself, the permeability of clay is related not only to the porosity, but also to the bound water and the thickness of electric double layer on the surface of clay particles. Based on this situation, it is of great significance to study the vacuum grouting technology for unsaturated clay strata. In this paper, the influence of vacuum field on the properties of unsaturated cohesive soil is analyzed by laboratory simulation test. The diffusion rule of slurry in unsaturated cohesive soil is obtained through the experiment, and the relationship between vacuum field and clay permeability is demonstrated. The main contents of this paper are as follows: (1) according to the properties of unsaturated cohesive soil and the characteristics of vacuum grouting test, a miniature vacuum pumping model box was designed. (2) the suitable ratio of acid water glass slurry was determined by laboratory test. The effect of temperature on gel time and viscosity of acidic water glass slurry was analyzed. According to the laboratory temperature, the suitable slurry ratio was selected. (3) the effects of different vacuum extraction time and vacuum degree on the binding water and electric double layer in clay were analyzed by means of a miniature vacuum simulation device. The influence law was summarized by thermogravimetric analyzer and Zeta potentiometer. (4) vacuum grouting simulation test was carried out on soil under different pumping time and different vacuum degree, and the grouting quantity was analyzed. The influence of vacuum field on the permeability of unsaturated cohesive soil is summarized and demonstrated by the variation rule of slurry diffusion radius, diffusion time and the shape of grouting consolidation.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU442

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