玻璃纖維水泥漿液巖溶隧道動(dòng)水注漿封堵機(jī)理及應(yīng)用研究
[Abstract]:Geological disasters such as water gushing or water inrush seriously hinder the progress of construction and threaten the safety of technicians and the stability of tunnel operation. With the increasing of underground water gushing disaster and its consequence becoming more and more complicated, grouting technology is a common method to solve the above problems. Therefore, the theory of hydrodynamic slurry diffusion, plugging mechanism and its engineering application are deeply studied. It can provide theoretical support and technical support for flood disaster management. Through laboratory tests, the physical and mechanical properties of glass fiber cement slurry were compared and analyzed according to the test results. Different grouting models and slurry plugging models were constructed, and the diffusion law and plugging mechanism of different flow types of slurry were studied. The glass fiber cement slurry has been successfully applied to Qiyueshan tunnel grouting project, and good water shutoff effect has been obtained. The following practical conclusions are obtained: (1) through laboratory tests, the effects of glass fiber content on the fluidity, tensile compressive strength and impermeability of cement paste are analyzed according to the experimental results, and the results show that with the increase of glass fiber content, The fluidity, tensile strength and impermeability grade of glass fiber cement slurry have been improved to some extent, but the compressive performance of glass fiber cement slurry has been increased first and then decreased, at the same time, The critical water-cement ratio of each flow pattern of glass fiber cement slurry is defined. (2) the spatial location of the outlet points of different tunnels is systematically divided into two types: the moving water slurry diffusion is divided into two types: facing water surface and back water surface. According to the characteristics of water gushing channel, a hydrodynamic grouting model of a single flat fissure and a single cylindrical pipeline is constructed. Based on the relevant theories of fluid mechanics, rheology and elasticity, the diffusive equations of slurry with different flow patterns are derived. The formula for calculating the diffusion of hydrodynamic slurry is defined theoretically. (3) according to the existing literature and indoor and outdoor tests, the method of determining the parameters of grouting is determined, and the influence of each parameter on the diffusion of slurry is analyzed by theoretical calculation. In a single plate grouting, it is difficult to diffuse the water surface slurry, but in a single pipe grouting, the slurry flow pattern has a more obvious effect on the slurry diffusion. At the same time, the mechanism and criterion of slurry plugging for single plate and single pipeline are analyzed, and the formulas for calculating the minimum plugging distance and critical grouting quantity are defined. To provide theoretical basis for the same type of engineering. (4) applying glass fiber cement slurry to the water shutoff project in Qiyueshan Tunnel, using the methods of geological analysis, geophysical exploration and drilling, etc. Water shutoff schemes were made for different water outlet points and further optimization was carried out, which improved the fluidity of cement slurry, improved the grouting effect and raised the success rate of grouting.
【學(xué)位授予單位】:山東科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U456.33
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