【摘要】：伴隨著我國經(jīng)濟(jì)的快速發(fā)展,城市建設(shè)步伐正在有序推進(jìn),大型熱力隧道工程作為城建的一個重要部分,是社會文明進(jìn)步的代表性產(chǎn)物,也是國家綜合實(shí)力的重要指標(biāo)。在既有的龐大的城市中建設(shè)隧道,是一項(xiàng)異常艱難的任務(wù),因?yàn)榧纫ＷC隧道施工的安全,又要保證不對既有構(gòu)筑物產(chǎn)生破壞,這些需要我們做出諸多的努力才可實(shí)現(xiàn)。 粉細(xì)砂地層是隧道建設(shè)者們最害怕遇到的地質(zhì)條件之一,不僅是其強(qiáng)度太低,擾動后極易液化,而且其天然優(yōu)良的滲水能力,通常導(dǎo)致完全無法開挖成形。針對這種現(xiàn)狀,本文從盡可能實(shí)用的角度做水玻璃系漿材在粉細(xì)砂地層中的應(yīng)用研究,并設(shè)計現(xiàn)場試驗(yàn)探求其變化規(guī)律。論文主要內(nèi)容如下： 1.整理既有工程中的粉細(xì)砂地層注漿技術(shù)概況,比較全面的闡述粉細(xì)砂的工程特點(diǎn)。確定本文研究內(nèi)容和方法,也作為后續(xù)試驗(yàn)和研究的基礎(chǔ)。 2.試驗(yàn)總結(jié)了不同配合比的水玻璃-水泥及水玻璃-磷酸凝膠時間,以及不同溫度下其凝膠時問。全章共完成試驗(yàn)80組,得到相關(guān)的凝膠時間變化規(guī)律。 3.試驗(yàn)考慮了不同配比的水玻璃-水泥及水玻璃-磷酸強(qiáng)度試驗(yàn),期間共完成試驗(yàn)66組,包括36組的直剪試驗(yàn)和30組的三軸試驗(yàn)。主要實(shí)驗(yàn)結(jié)論：水玻璃-磷酸試樣養(yǎng)護(hù)28day后,粘聚力下降,內(nèi)摩擦角增大；水泥-水玻璃試樣養(yǎng)護(hù)28day后,粘聚力上升,內(nèi)摩擦角增大,主要力學(xué)性能明顯受水泥影響。 4.數(shù)值模擬研究注漿過程巖土力學(xué)問題。針對既定工程案例,完成了注漿圈參數(shù)模擬計算5組,得到塑性區(qū)與注入面積變化規(guī)律。此外,完全基于數(shù)值模擬假設(shè),完成了注漿缺陷分析研究30組,并提出注漿過程中的“最不利缺陷區(qū)域”。 5.利用Photoshop計算10個斷面的漿脈填充率方案,并結(jié)合現(xiàn)場統(tǒng)計的相應(yīng)的注漿量、隧道涌水量等數(shù)據(jù)。主要研究圍繞這三個變量之間展開,確定其相關(guān)性數(shù)據(jù),并結(jié)合開挖情況給出注漿效果評定標(biāo)準(zhǔn)。 本文的研究內(nèi)容和成果,希望能夠應(yīng)用到更多的隧道建設(shè)工程中去,能夠?yàn)樯鐣暙I(xiàn)一點(diǎn)點(diǎn)成果。
[Abstract]:With the rapid economic development of our country, the pace of urban construction is advancing in an orderly manner. As an important part of urban construction, the large-scale thermal tunnel project is the representative product of the progress of social civilization and an important indicator of the comprehensive strength of the country. It is an extremely difficult task to build tunnels in existing large cities because we need to make a lot of efforts to ensure the safety of tunnel construction and not to destroy the existing structures. Silty sand formation is one of the geological conditions that tunnel builders are afraid of most. It is not only that its strength is too low, it is easy to liquefy after disturbance, but also that its natural excellent seepage ability usually leads to completely unable to excavate and form. In view of this situation, the application of sodium silicate slurry in silty sand strata is studied from the practical point of view as far as possible, and the field test is designed to find out its variation law. The main contents of the thesis are as follows: 1. This paper summarizes the grouting technology of silty sand strata in existing projects, and expounds the engineering characteristics of silt sand comprehensively. Determine the content and methods of this study, but also as the basis for further experiments and research. 2. The time of water glass-cement and water glass-phosphoric acid gel with different mix ratio and the time of gel at different temperature were summarized. A total of 80 groups were completed in the whole chapter, and the change of gel time was obtained. 3. The strength tests of sodium silicate cement and sodium silicate phosphoric acid with different proportions were considered. During the test 66 groups including 36 direct shear tests and 30 triaxial tests were completed. The main experimental conclusions are as follows: after curing 28day with sodium silicate and phosphoric acid, the cohesion force decreases and the internal friction angle increases, while the cohesion force increases and the internal friction angle increases after curing 28day, and the main mechanical properties are obviously affected by cement. 4. Numerical simulation is used to study geotechnical mechanics in grouting process. In this paper, five groups of grouting ring parameters are simulated and calculated, and the variation of plastic zone and injection area is obtained. In addition, on the basis of numerical simulation assumption, 30 groups of grouting defect analysis were completed, and the "most unfavorable defect area" in grouting process was proposed. 5. Photoshop was used to calculate the filling rate of 10 sections, and the corresponding data such as grouting quantity and tunnel water inflow were analyzed. The research mainly focuses on the three variables, determines the correlation data, and gives the evaluation standard of grouting effect combined with the excavation. The research contents and results of this paper hope to be applied to more tunnel construction projects and contribute a little achievement to the society.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.4

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