水泥浆液渗透注浆扩散机理试验研究
[Abstract]:In this paper, the diffusion mechanism of cement slurry osmotic grouting is studied, which mainly includes two aspects. On the one hand, on the basis of summing up the previous achievements, a reusable osmotic grouting simulation system has been developed independently, on the other hand, the infiltration diffusion process of cement slurry with different water-cement ratio in sand layer has been simulated by using the developed osmotic grouting simulation system, and the grouting diffusion radius has been sorted out. The functional relationship between pressure dissipation and grouting parameters (slurry / water-cement ratio, permeability coefficient of sand layer, grouting pressure). The seepage grouting simulation system developed by ourselves includes four parts: test main system, grouting system, sensor system and measurement system. The uniform test design is selected for the test scheme. The main idea of the development is to ensure that the osmotic grouting simulation test can be carried out accurately, conveniently and economically. Several osmotic grouting tests have been carried out by using the developed simulation system, and a series of laws have been obtained through regression analysis of the test data: (1) the regression relationship between osmotic grouting diffusion radius and grouting pressure, sand layer permeability coefficient and slurry water-cement ratio is determined. among the three factors affecting diffusion radius, grouting pressure has the greatest influence on diffusion radius, followed by permeability coefficient. The effect of slurry water-cement ratio is the smallest. (2) the diffusion radius of permeable grouting obtained from the test is smaller than that deduced by theory, mainly because the slurry has the characteristics of viscosity time-varying and does not consider the time-varying viscosity in the theoretical formula. (3) in the process of gradually increasing the range of slurry diffusion, the grouting pressure along the grouting process is not uniformly dissipated with the increase of grouting distance, but decays quickly near the grouting point. After that, with the increase of the position from the grouting point, the attenuation of grouting pressure slows down gradually until the dissipation of grouting pressure is zero. There is a great difference between before and after the dissipation of grouting pressure, that is to say, the dissipation curve of grouting pressure is concave curve.
【学位授予单位】:山东大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TU472
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