粉细砂层中热力暗挖隧道深孔帷幕注浆止水与加固技术研究
发布时间：2018-12-14 13:53
【摘要】：伴随着我国经济的快速发展,城市建设步伐正在有序推进,大型热力隧道工程作为城建的一个重要部分,是社会文明进步的代表性产物,也是国家综合实力的重要指标。在既有的庞大的城市中建设隧道,是一项异常艰难的任务,因为既要保证隧道施工的安全,又要保证不对既有构筑物产生破坏,这些需要我们做出诸多的努力才可实现。 粉细砂地层是隧道建设者们最害怕遇到的地质条件之一,不仅是其强度太低,扰动后极易液化,而且其天然优良的渗水能力,通常导致完全无法开挖成形。针对这种现状,本文从尽可能实用的角度做水玻璃系浆材在粉细砂地层中的应用研究,并设计现场试验探求其变化规律。论文主要内容如下： 1.整理既有工程中的粉细砂地层注浆技术概况,比较全面的阐述粉细砂的工程特点。确定本文研究内容和方法,也作为后续试验和研究的基础。 2.试验总结了不同配合比的水玻璃-水泥及水玻璃-磷酸凝胶时间,以及不同温度下其凝胶时问。全章共完成试验80组,得到相关的凝胶时间变化规律。 3.试验考虑了不同配比的水玻璃-水泥及水玻璃-磷酸强度试验,期间共完成试验66组,包括36组的直剪试验和30组的三轴试验。主要实验结论：水玻璃-磷酸试样养护28day后,粘聚力下降,内摩擦角增大；水泥-水玻璃试样养护28day后,粘聚力上升,内摩擦角增大,主要力学性能明显受水泥影响。 4.数值模拟研究注浆过程岩土力学问题。针对既定工程案例,完成了注浆圈参数模拟计算5组,得到塑性区与注入面积变化规律。此外,完全基于数值模拟假设,完成了注浆缺陷分析研究30组,并提出注浆过程中的“最不利缺陷区域”。 5.利用Photoshop计算10个断面的浆脉填充率方案,并结合现场统计的相应的注浆量、隧道涌水量等数据。主要研究围绕这三个变量之间展开,确定其相关性数据,并结合开挖情况给出注浆效果评定标准。 本文的研究内容和成果,希望能够应用到更多的隧道建设工程中去,能够为社会贡献一点点成果。
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4
本文编号：2378720
[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.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4
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