粘土水泥浆材流变特性及其工程影响

发布时间：2018-04-12 19:22

本文选题：粘土水泥浆材 + 流变特性　；参考：《长沙理工大学》2015年硕士论文

【摘要】：粘土水泥浆材性能优越,已广泛应用于水利工程、矿山工程、垃圾填埋场等防渗堵漏及基础加固。目前对粘土水泥浆材的基本性能研究较多,但对其流变性能,尤其是流变对灌浆工程的影响研究较少。本文对粘土水泥浆材的流变特性展开较为细致的研究,主要研究内容及成果如下:(1)利用Brookfield+R/S流变仪对粘土水泥系列浆材层流状态下的流变参数进行测试,研究水固比、粘土加量、温度等因素以及压滤作用对流变参数的影响;水固比小于等于1.0:1的浆材为宾汉流体,水固比大于1.0:1的为牛顿流体;粘土加量对流变参数的影响与水固比密切相关;浆材的流变参数随温度改变而变化。(2)利用研发的压滤试验装置配合流变仪进行浆液在岩土体吸附作用下的浆材流变特性的循环测试,以及浆材在压滤效应前后期流变特性的变化;岩土体吸附作用下浆材的粘度以及屈服应力逐渐增大;粘土水泥浆材更易发生压滤效应,且压滤效应对粘土水泥浆材的影响较纯水泥浆小。考虑灌浆过程中岩土体对浆液的吸附作用,粘土水泥浆材的流型是有可能发生变化的。(3)对粘土水泥浆材颗粒进行粒径分析,并引入相关公式,利用测得的流变参数进行计算论证。得出粘土颗粒粒径小于普通水泥颗粒,在浆材粒径可以进入裂隙的前提条件下,粘土水泥浆材的可灌性优于纯水泥浆材。(4)进行灌浆试验,研究影响粘土水泥浆材流变特性的因素对可灌性的影响。揭示了水固比、粘土加量、灌浆压力等对可灌性的影响。比较分析现有的扩散模型,论证了粘土水泥浆材的扩散距离随流变性能的变而变化。对于牛顿流体,浆材粘度越小,扩散越远;对于宾汉流体,屈服应力对扩散距离影响较粘度大,且屈服应力越大,扩散距离越小。浆材的材料力学性能研究已较充分,但其流变特性对工程的实际影响不甚明了,应努力研究并发现浆材的流变特性的工程影响,以影响为突破口来研制出更加适合灌浆的灌浆材料。
[Abstract]:Clay cement paste has been widely used in water conservancy engineering, mine engineering, landfill and other seepage prevention, leakage plugging and foundation reinforcement.At present, there are many researches on the basic properties of clay cement paste, but few on its rheological properties, especially the influence of rheology on grouting engineering.The effects of clay addition, temperature and pressure filtration on rheological parameters, the effect of clay addition on rheological parameters, the effect of clay addition on rheological parameters, the effects of clay addition on rheological parameters, and the effects of clay addition on rheological parameters are closely related to those of Bingham fluid and Newtonian fluid with water / solid ratio less than 1.0: 1 and 1.0: 1, respectively.The rheological parameters of slurry vary with the change of temperature. (2) the rheological properties of slurry under the adsorption of rock and soil are measured by using the developed pressure filtration test device and rheometer.The effect of pressure filtration on clay cement paste is smaller than that of pure cement slurry.Considering the adsorption effect of rock and soil on slurry during grouting, the flow pattern of clay cement is likely to change, and the particle size of clay cement is analyzed, and the relevant formula is introduced.The measured rheological parameters are used for calculation and demonstration.The results show that the particle size of clay is smaller than that of ordinary cement, and the grouting test is carried out on the condition that the size of slurry can enter the fissure, and the irrigability of clay cement is better than that of pure cement.The influence of the factors affecting the rheological properties of clay cement paste on the irrigability was studied.The effects of water / solid ratio, clay addition and grouting pressure on irrigability are revealed.By comparing and analyzing the existing diffusion models, it is demonstrated that the diffusion distance of clay cement paste varies with the rheological properties.For Newtonian fluid, the lower the viscosity of the slurry, the farther the diffusion, and for the Bingham fluid, the effect of yield stress on the diffusion distance is greater than that of the viscosity, and the larger the yield stress is, the smaller the diffusion distance is.The mechanical properties of slurry materials have been fully studied, but the effect of rheological properties on engineering is not clear. Therefore, it is necessary to study and find out the engineering effects of rheological properties of slurry materials.A more suitable grouting material was developed by using the influence as the breakthrough point.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU578

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