水泥浆液渗透注浆扩散机理试验研究

发布时间：2019-07-02 10:09

【摘要】：本文试验研究了水泥浆液渗透注浆的扩散机理,主要包括两个方面,一方面是在总结前人成果的基础上,自主研制开发了可重复利用的渗透注浆模拟系统,另一方面是利用研制的渗透注浆模拟系统,模拟了不同水灰比的水泥浆液在砂层中渗透扩散的过程,并整理了注浆扩散半径、沿程压力耗散与注浆参数(浆液水灰比、砂层渗透系数、注浆压力)之间的函数关系。自主开发研制的渗透注浆模拟系统包括了试验主体系统、注浆系统、传感器系统和测量系统四个部分,试验的方案选择了均匀试验设计,研制的主要思路是保证渗透注浆模拟试验能够准确、方便、经济的进行。利用研制的模拟系统做了多次渗透注浆试验,通过对试验数据进行回归分析得到了一系列的规律：(1)确定了渗透注浆扩散半径与注浆压力、砂层渗透系数、浆液水灰比之间的回归关系,在影响扩散半径的三种因素中,注浆压力对扩散半径的影响最大,渗透系数的影响其次,浆液水灰比的影响最小。(2)试验得到的渗透注浆扩散半径比理论推导的扩散半径要小,主要是因为浆液具有粘度时变性的特点,理论公式中没有考虑粘度的时变性。(3)在浆液扩散的范围逐渐增大的过程中,注浆沿程压力并不是随着注浆距离的增加而均匀耗散的,而是在注浆点附近衰减的快,此后随着距离注浆点位置增大,注浆压力的衰减逐渐减缓,直到注浆压力耗散为零；注浆沿程压力的耗散前后差异很大,即沿程压力的耗散曲线是呈现凹曲线型的。
[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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