The Study Of Waterstop And Reinforcement Technology With Deep-hole Curtain Grouting At Thermal Mining Tunnel In Silty-fine Sand Layer

In condition of the rapid development of China’s economy, the pace of urban construction is accelerating. Meanwhile, the construction of large-scale urban tunnels, which is a key part of urban construction, is both the indicator of comprehensive national strength and the result of social progress. The construction of urban tunnels in the metropolitans is a very difficult task, as we have to ensure both the safety of the components of tunnel construction and the effective prevention of serious accidents. In order to fulfill this goal, engineers need to make great efforts and get prepared.Silty-fine sand is one of the most perilous geological conditions for the constructors of tunnels, not only because of its low strength with the disturbance which can easily lead to its liquefaction, but also its excellent natural penetration capacity of shapelessness. In view of this situation, this paper made a general study of grouting in the fine sand layer with sodium silicate as far as possible from the practical point of view, and obtains some rules of it afterwards. The main content is designed as following:1. This section summarizes the overview of grouting technology in the silty-fine sand, and comprehensively describes the nature of it. A study line is put up as the base of the following test.2. Our test includes the gel time of sodium silicate-cement and sodium silicate-phosphoric acid in the different temperatures and different proportions. There are80groups of the samples and finally conclude a detailed regular of the gel time.3. Our test includes the strength test of sodium silicate-cement and sodium silicate-phosphoric acid in the different proportions. There are66groups which include36groups of direct shear test and30groups of triaxial test. Our main conclusions are as follows:the cohesive force of the S-P samples declined and the friction angles increased; the cohesive force of the S-C samples increased and the friction angles increased. And the main mechanical properties are significantly affected by cement.4. The numerical simulation of tunnel grouting is an applicable method which can fully reflect the changes of the surrounding rock during grouting process. According to the real project, the thickness of grouting’s parameters is studied by the GTS. Besides, based on the totally numerical simulation, I completed the research about the effects of grouting defects and put forward the theory of"the necessary area of grouting".5. This section designs a plan of calculating the filling rate of grouting in10samples, and obtains the statistics of both grouting volume and the water inflow. Using these3variables, we eventually conclude the correlations among them.We sincerely hope that our conclusions and achievements would have comprehensively practical effects on the construction of urban tunnel in the future.